All Calculators
Explore every calculator on DigiToolkit in one place. Search, filter by category, jump by first letter, or sort by popularity. Each calculator is free, runs in your browser and shows the formula and a worked example so you can trust the result.
📈Finance & Investment
APR Calculator
APR (effective) = (1 + r/n)^n - 1
Open calculator →📈Finance & Investment
APY Calculator
APR (effective) = (1 + r/n)^n - 1
Open calculator →🔢Mathematics
Adding Fractions Calculator
Apply the operation, then simplify by the GCD
Open calculator →📅Date & Time
Age Calculator
Difference between the two dates expressed in years, months and days
Open calculator →📅Date & Time
Age Difference Calculator
Count days between two dates and express in multiple units
Open calculator →🔢Mathematics
Algebra Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →💼Business & Commerce
Amazon FBA Calculator
Profit = price - product cost - fees; margin = profit/price x 100
Open calculator →📈Finance & Investment
Annuity Calculator
FV = PMT x ((1+r)^n - 1)/r; PV = PMT x (1-(1+r)^-n)/r
Open calculator →📐Geometry & Measurement
Arc Length Calculator
Arc = 2 pi r x (angle/360); Sector area = pi r^2 x (angle/360)
Open calculator →📐Geometry & Measurement
Area Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator →🔄Converters
Area Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →📐Geometry & Measurement
Aspect Ratio Calculator
Ratio = width / height, simplified to lowest terms
Open calculator →🏛️Retirement & Government Schemes
Atal Pension Yojana Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator →🔢Mathematics
Average Calculator
Mean = sum of values / count
Open calculator →🔢Mathematics
Average Percentage Calculator
Mean = sum of values / count
Open calculator →🚗Travel & Automotive
Average Speed Calculator
Average speed = total distance / total time
Open calculator →❤️Health & Fitness
BMI Calculator
BMI = weight(kg) / height(m)^2
Open calculator →❤️Health & Fitness
BMR Calculator
Mifflin-St Jeor: BMR = 10xkg + 6.25xcm - 5xage + (5 male / -161 female)
Open calculator →🔢Mathematics
BODMAS Calculator
Safely evaluate the mathematical expression
Open calculator →🧮General Calculators
Basic Calculator
Safely evaluate the mathematical expression
Open calculator →🔢Mathematics
Binary Addition Calculator
Parse from the source base and render in the target base
Open calculator →🔢Mathematics
Binary Calculator
Parse from the source base and render in the target base
Open calculator →🔢Mathematics
Binary Subtraction Calculator
Parse from the source base and render in the target base
Open calculator →📈Finance & Investment
Black-Scholes Calculator
Black-Scholes-Merton option pricing for European options
Open calculator →❤️Health & Fitness
Body Fat Calculator
US Navy method using log10 of body circumferences and height
Open calculator →❤️Health & Fitness
Body Shape Calculator
WHR = waist / hip
Open calculator →❤️Health & Fitness
Body Surface Area Calculator
Du Bois: BSA = 0.007184 x weight^0.425 x height^0.725
Open calculator →❤️Health & Fitness
Body Weight Calculator
Robinson formula plus a BMI 18.5-24.9 healthy range
Open calculator →📈Finance & Investment
Bond Calculator
Price = sum( coupon / (1+y)^t ) + face / (1+y)^n
Open calculator →❤️Health & Fitness
Bra Size Calculator
Band from underbust; cup from the bust-minus-underbust difference
Open calculator →🧱Construction & Materials
Brick Calculator
Standard brick 0.19 x 0.09 x 0.09 m with mortar; bricks = wall volume / brick volume
Open calculator →📅Date & Time
Business Days Calculator
Count weekdays (Mon-Fri) between the two dates, excluding weekends
Open calculator →🏦Loans & EMI
Business Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →📈Finance & Investment
CAGR Calculator
CAGR = (End / Begin)^(1/years) - 1
Open calculator →🧾Tax & Salary
CTC Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator →⚡Engineering & Electrical
Cable Size Calculator
Pick the smallest copper cross-section keeping voltage drop within about 3% (simplified)
Open calculator →🧮General Calculators
Calculator
Safely evaluate the mathematical expression
Open calculator →🔢Mathematics
Calculus Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →❤️Health & Fitness
Calorie Calculator
TDEE +/- calorie adjustment for the goal
Open calculator →❤️Health & Fitness
Calorie Deficit Calculator
TDEE +/- calorie adjustment for the goal
Open calculator →🏦Loans & EMI
Car Loan EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →❤️Health & Fitness
Carbohydrate Calculator
Carbs/protein at 4 kcal/g, fat at 9 kcal/g, split by chosen ratio
Open calculator →🔄Converters
Centimeters to Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →📐Geometry & Measurement
Circle Area Calculator
Area = pi x r^2; Circumference = 2 x pi x r
Open calculator →📐Geometry & Measurement
Circumference Calculator
Area = pi x r^2; Circumference = 2 x pi x r
Open calculator →📐Geometry & Measurement
Circumference-to-Diameter Calculator
Diameter = circumference / pi
Open calculator →🏦Loans & EMI
Commercial Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →💼Business & Commerce
Commission Calculator
Commission = sales x rate/100
Open calculator →📈Finance & Investment
Compound Interest Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator →🧱Construction & Materials
Construction Calculator
Volume = L x W x D; dry volume x 1.54 split by the mix ratio
Open calculator →🏦Loans & EMI
Credit Card Calculator
Iterate monthly: balance grows by monthly rate, falls by payment
Open calculator →🔢Mathematics
Cube Root Calculator
result = value^(1/root)
Open calculator →🔢Mathematics
Cubic Equation Solver
Solve ax^3 + bx^2 + cx + d = 0 numerically
Open calculator →📐Geometry & Measurement
Cubic Feet Calculator
Volume = length x width x height
Open calculator →🔄Converters
Cubic Feet to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →📐Geometry & Measurement
Cubic Meter Calculator
Volume = length x width x height
Open calculator →🔄Converters
Currency Converter
Converted = amount x exchange rate
Open calculator →⚡Engineering & Electrical
Current Calculator
V = I x R; P = V x I (leave the unknown as 0)
Open calculator →📐Geometry & Measurement
Cylinder Area Calculator
Volume = pi x r^2 x h; Surface = 2 pi r (r + h)
Open calculator →🧮General Calculators
Data Calculator
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →📅Date & Time
Date Calculator
Resulting date = start date + days (negative subtracts)
Open calculator →📅Date & Time
Date Difference Calculator
Count days between two dates and express in multiple units
Open calculator →📅Date & Time
Date and Time Calculator
Resulting date = start date + days (negative subtracts)
Open calculator →📅Date & Time
Days Until Calculator
Days remaining = target date - today
Open calculator →🏦Loans & EMI
Debt-to-Income Ratio Calculator
DTI = monthly debt / monthly income x 100
Open calculator →🔢Mathematics
Decimal Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator →🔄Converters
Decimal to Fraction Converter
Convert decimal to fraction and simplify by the GCD
Open calculator →🔄Converters
Decimal to Hexadecimal Converter
Parse from the source base and render in the target base
Open calculator →📐Geometry & Measurement
Degree Calculator
Convert between degrees, radians and gradians (180 deg = pi rad = 200 grad)
Open calculator →📐Geometry & Measurement
Density Calculator
Density = mass / volume
Open calculator →📈Finance & Investment
Depreciation Calculator
Straight line = (cost - salvage)/life; DDB rate = 2/life on book value
Open calculator →🔢Mathematics
Derivative Calculator
Symbolic differentiation with respect to the variable
Open calculator →🔢Mathematics
Difference Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator →📈Finance & Investment
Dilution Calculator
After % = your shares / (existing + new shares) x 100
Open calculator →💼Business & Commerce
Discount Calculator
Saving = Price x discount/100; Final = Price - Saving
Open calculator →🚗Travel & Automotive
Distance Calculator
Haversine formula on the Earth's radius (6371 km)
Open calculator →🔢Mathematics
Dividing Fractions Calculator
Apply the operation, then simplify by the GCD
Open calculator →🔢Mathematics
Division Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator →🔢Mathematics
Double Integral Calculator
Numeric integration (Simpson's rule) from a to b
Open calculator →🏦Loans & EMI
Down Payment Calculator
Down payment = price x percent/100; loan = price - down payment
Open calculator →📈Finance & Investment
ELSS Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator →🏦Loans & EMI
EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1), where r = monthly rate, n = months
Open calculator →📈Finance & Investment
Effective Annual Rate Calculator
APR (effective) = (1 + r/n)^n - 1
Open calculator →🔢Mathematics
Eigenvalue Calculator
Compute determinant, inverse or transpose of a square matrix
Open calculator →⚡Engineering & Electrical
Energy Calculator
kWh = power(kW) x hours x days; cost = kWh x tariff
Open calculator →🔢Mathematics
Equation Solver
x = -b / a
Open calculator →📈Finance & Investment
Equity Calculator
Equity value = total value x ownership / 100
Open calculator →🔢Mathematics
Exponent Calculator
result = base^power
Open calculator →❤️Health & Fitness
FFMI Calculator
FFMI = lean mass(kg) / height(m)^2; normalised adds 6.1 x (1.8 - height_m)
Open calculator →📈Finance & Investment
FIRE Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator →❤️Health & Fitness
Face Golden Ratio Calculator
phi about 1.6180339887; longer = value x phi, shorter = value / phi
Open calculator →❤️Health & Fitness
Face Shape Calculator
Ratio = face length / face width; classified into common face-shape bands
Open calculator →🔢Mathematics
Factorial Calculator
n! = n x (n-1) x ... x 1
Open calculator →🔢Mathematics
Factoring Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →🔄Converters
Feet Calculator
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔄Converters
Feet and Inches Calculator
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔄Converters
Feet to Inches Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔄Converters
Feet to Meters Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔄Converters
Feet to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔢Mathematics
Fibonacci Calculator
F(n) = F(n-1) + F(n-2), starting 0, 1
Open calculator →📈Finance & Investment
Financial Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator →💳Banking & Deposits
Fixed Deposit Calculator
A = P x (1 + r/n)^(n x t)
Open calculator →📈Finance & Investment
Forex Calculator
Converted = amount x exchange rate
Open calculator →📈Finance & Investment
Forex Compounding Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator →🔢Mathematics
Fraction Calculator
Apply the operation, then simplify by the GCD
Open calculator →🔢Mathematics
Function Calculator
Safely evaluate the mathematical expression
Open calculator →📈Finance & Investment
Future Value Calculator
FV = PV x (1 + r)^t
Open calculator →📈Finance & Investment
Future Value of Annuity Calculator
FV = PMT x ((1+r)^n - 1)/r; PV = PMT x (1-(1+r)^-n)/r
Open calculator →🎓Education
GPA Calculator
GPA = sum(grade point x credit) / sum(credit)
Open calculator →🎓Education
GPA to Percentage Converter
Percentage = CGPA x factor (commonly 9.5 for CBSE)
Open calculator →🧾Tax & Salary
GST Calculator
Add: GST = Amount x rate/100. Remove: Net = Amount x 100/(100+rate)
Open calculator →⚡Engineering & Electrical
Gear Ratio Calculator
Ratio = driven / driving; output rpm = input x driving / driven
Open calculator →❤️Health & Fitness
Gestational Age Calculator
Naegele's rule: due date = LMP + 280 days
Open calculator →🏦Loans & EMI
Gold Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🔢Mathematics
Golden Ratio Calculator
phi about 1.6180339887; longer = value x phi, shorter = value / phi
Open calculator →🧮General Calculators
Graphing Calculator
Safely evaluate the mathematical expression
Open calculator →🧾Tax & Salary
Gratuity Calculator
Gratuity = (15 x last salary x years) / 26
Open calculator →🔢Mathematics
Growth Calculator
CAGR = (End / Begin)^(1/years) - 1
Open calculator →🔢Mathematics
HCF/GCD Calculator
GCD via Euclid's algorithm; LCM = product / GCD pairwise
Open calculator →🧾Tax & Salary
HRA Calculator
Exemption = least of (actual HRA, rent - 10% of basic, 50%/40% of basic)
Open calculator →❤️Health & Fitness
Harris-Benedict Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator →🚗Travel & Automotive
Haversine Distance Calculator
Haversine formula on the Earth's radius (6371 km)
Open calculator →❤️Health & Fitness
Height Calculator
Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2
Open calculator →❤️Health & Fitness
Height Percentile Calculator
Mid-parental height: boys = (father + mother + 13)/2; girls = (father + mother - 13)/2
Open calculator →🔢Mathematics
Hexadecimal Calculator
Parse from the source base and render in the target base
Open calculator →🏦Loans & EMI
Home Loan EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →💳Banking & Deposits
IBAN Calculator
Parse from the source base and render in the target base
Open calculator →📈Finance & Investment
IRR Calculator
IRR is the discount rate that makes NPV = 0 (found numerically)
Open calculator →❤️Health & Fitness
Ideal Weight Calculator
Robinson formula plus a BMI 18.5-24.9 healthy range
Open calculator →🧾Tax & Salary
Import Duty Calculator
Duty = value x duty%; IGST = (value + duty) x gst%; total = value + duty + IGST
Open calculator →🔄Converters
Inches to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🧾Tax & Salary
Income Tax Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator →🔢Mathematics
Integer Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator →🔢Mathematics
Integral Calculator
Numeric integration (Simpson's rule) from a to b
Open calculator →📈Finance & Investment
Interest Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator →🔢Mathematics
Inverse Matrix Calculator
Compute determinant, inverse or transpose of a square matrix
Open calculator →🔢Mathematics
Inverse Sine Calculator
Return the inverse trig angle in degrees and radians
Open calculator →📈Finance & Investment
Investment Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator →📅Date & Time
Julian Date Converter
Convert a Gregorian date to its Julian day number and day-of-year
Open calculator →🔄Converters
Kilograms to Pounds Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔢Mathematics
LCM Calculator
GCD via Euclid's algorithm; LCM = product / GCD pairwise
Open calculator →💼Business & Commerce
LTV Calculator
LTV = average value x purchase frequency x lifespan
Open calculator →📐Geometry & Measurement
Land Area Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator →🏦Loans & EMI
Land Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🔢Mathematics
Laplace Transform Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →❤️Health & Fitness
Lean Body Mass Calculator
Boer formula for lean body mass
Open calculator →📐Geometry & Measurement
Length Calculator
m = (y2 - y1) / (x2 - x1)
Open calculator →🔄Converters
Length Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →❤️Health & Fitness
Life Expectancy Calculator
Population-average life expectancy (India, ~70 years) used as a reference, not a personal prediction
Open calculator →🔢Mathematics
Limits Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →🔢Mathematics
Linear Equation Calculator
x = -b / a
Open calculator →🏦Loans & EMI
Loan Amortization Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🏦Loans & EMI
Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🏦Loans & EMI
Loan Interest Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🔢Mathematics
Logarithm Calculator
log_base(value) = ln(value) / ln(base)
Open calculator →🔢Mathematics
Long Division Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator →📈Finance & Investment
Lumpsum Calculator
FV = P x (1 + r)^t
Open calculator →📈Finance & Investment
Margin Calculator
Profit = revenue - cost; margin = profit/revenue x 100; markup = profit/cost x 100
Open calculator →🎓Education
Marks Percentage Calculator
Percentage = obtained / total x 100
Open calculator →💼Business & Commerce
Markup Calculator
Price = cost x (1 + markup/100)
Open calculator →📐Geometry & Measurement
Mass Calculator
Weight = volume x density
Open calculator →⚡Engineering & Electrical
Material Weight Calculator
Weight = volume x density
Open calculator →🔢Mathematics
Math Calculator
Safely evaluate the mathematical expression
Open calculator →🔢Mathematics
Math Solver
Safely evaluate the mathematical expression
Open calculator →🔢Mathematics
Matrix Calculator
Compute determinant, inverse or transpose of a square matrix
Open calculator →🔢Mathematics
Matrix Multiplication Calculator
Standard matrix multiplication (columns of A must equal rows of B)
Open calculator →🔢Mathematics
Matrix Solver
Compute determinant, inverse or transpose of a square matrix
Open calculator →📊Statistics & Data
Median Calculator
Sort the values; median is the middle value (or mean of the two middle)
Open calculator →🚗Travel & Automotive
Mileage Calculator
Mileage = distance / fuel used
Open calculator →🔄Converters
Miles to Kilometers Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔄Converters
Milliliters to Liters Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🔢Mathematics
Mixed Fraction Calculator
Apply the operation, then simplify by the GCD
Open calculator →🔢Mathematics
Modulo Calculator
remainder = a - b x floor(a/b)
Open calculator →📈Finance & Investment
Money Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator →📅Date & Time
Month Calculator
Count days between two dates and express in multiple units
Open calculator →🔢Mathematics
Multiplication Calculator
Apply the chosen arithmetic operation to the two numbers
Open calculator →🔢Mathematics
Multiplying Fractions Calculator
Apply the operation, then simplify by the GCD
Open calculator →📈Finance & Investment
Mutual Fund Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator →🏛️Retirement & Government Schemes
NPS Calculator
FV = P x [((1+i)^n - 1) / i] x (1+i), where i = monthly rate, n = months
Open calculator →📈Finance & Investment
NPV Calculator
NPV = -initial + sum( CF_t / (1+r)^t )
Open calculator →🏛️Retirement & Government Schemes
National Savings Certificate Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator →📈Finance & Investment
Net Worth Calculator
Net worth = total assets - total liabilities
Open calculator →🧾Tax & Salary
New Tax Regime Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator →🧮General Calculators
Non-Programmable Calculator
Safely evaluate the mathematical expression
Open calculator →⚡Engineering & Electrical
Ohm's Law Calculator
V = I x R; P = V x I (leave the unknown as 0)
Open calculator →📐Geometry & Measurement
PPI Calculator
PPI = sqrt(width^2 + height^2) / diagonal
Open calculator →⚡Engineering & Electrical
PPM Calculator
ppm = part / total x 1000000
Open calculator →📈Finance & Investment
PPP Calculator
Converted = amount x exchange rate
Open calculator →🧱Construction & Materials
Paint Calculator
Litres = area x coats / coverage
Open calculator →⚡Engineering & Electrical
Parallel Resistor Calculator
Series: R = sum. Parallel: 1/R = sum(1/Ri)
Open calculator →🔢Mathematics
Partial Fraction Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →📈Finance & Investment
Payback Period Calculator
Payback = initial investment / annual cash inflow
Open calculator →🧾Tax & Salary
Payroll Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator →🏛️Retirement & Government Schemes
Pension Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator →💼Business & Commerce
Percent-Off Calculator
Saving = Price x discount/100; Final = Price - Saving
Open calculator →🔢Mathematics
Percentage Calculator
Result = (percent / 100) x value
Open calculator →🔢Mathematics
Percentage Change Calculator
Change % = (new - old) / |old| x 100
Open calculator →📊Statistics & Data
Percentile Calculator
Linear-interpolation percentile of the sorted data
Open calculator →🏦Loans & EMI
Personal Loan EMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🔢Mathematics
Pi Calculator
Return pi to the requested number of decimal places
Open calculator →⚡Engineering & Electrical
Pipe Weight Calculator
Weight = volume x density
Open calculator →📈Finance & Investment
Pivot Point Calculator
Pivot = (H+L+C)/3; R1 = 2P-L; S1 = 2P-H; R2 = P+(H-L); S2 = P-(H-L)
Open calculator →🏛️Retirement & Government Schemes
Post Office Monthly Income Scheme Calculator
Monthly income = principal x rate / 1200
Open calculator →🏛️Retirement & Government Schemes
Postal Life Insurance Calculator
Simple: P x r x t. Compound: P x (1+r)^t - P
Open calculator →🔄Converters
Pounds to Kilograms Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →⚡Engineering & Electrical
Power Calculator
1ph: P = V x I x pf; 3ph: P = sqrt(3) x V x I x pf
Open calculator →⚡Engineering & Electrical
Power Consumption Calculator
kWh = power(kW) x hours x days; cost = kWh x tariff
Open calculator →📈Finance & Investment
Present Value Calculator
PV = FV / (1 + r)^t
Open calculator →📈Finance & Investment
Present Value of Annuity Calculator
FV = PMT x ((1+r)^n - 1)/r; PV = PMT x (1-(1+r)^-n)/r
Open calculator →💼Business & Commerce
Price Calculator
Price = cost x (1 + markup/100)
Open calculator →🔢Mathematics
Prime Factorization Calculator
Trial division to express n as a product of primes
Open calculator →💼Business & Commerce
Profit Calculator
Profit = revenue - cost; margin = profit/revenue x 100; markup = profit/cost x 100
Open calculator →💼Business & Commerce
Profit Margin Calculator
Profit = revenue - cost; margin = profit/revenue x 100; markup = profit/cost x 100
Open calculator →📈Finance & Investment
Profitability Index Calculator
PI = PV of future cash flows / initial investment
Open calculator →🧮General Calculators
Programmable Calculator
Safely evaluate the mathematical expression
Open calculator →🧾Tax & Salary
Property Tax Calculator
Property tax = assessed value x rate / 100
Open calculator →🔢Mathematics
Proportion Calculator
A/B = C/D => D = C x B / A
Open calculator →❤️Health & Fitness
Protein Intake Calculator
Protein = weight(kg) x factor (g/kg)
Open calculator →🏛️Retirement & Government Schemes
Public Provident Fund Calculator
Each yearly contribution compounds annually: M = sum of P x (1 + r)^(years remaining)
Open calculator →🔢Mathematics
Quadratic Equation Calculator
x = (-b +/- sqrt(b^2 - 4ac)) / 2a
Open calculator →📈Finance & Investment
ROI Calculator
ROI = (Final value - Amount invested) / Amount invested x 100
Open calculator →📊Statistics & Data
Range Calculator
Range = maximum - minimum
Open calculator →🔢Mathematics
Ratio Calculator
Simplify A:B by their GCD; scale proportionally if a target is given
Open calculator →💳Banking & Deposits
Recurring Deposit Calculator
Each monthly deposit compounds quarterly until maturity; M = sum of P x (1 + r/4)^(quarters remaining)
Open calculator →⚡Engineering & Electrical
Resistor Calculator
Series: R = sum. Parallel: 1/R = sum(1/Ri)
Open calculator →🏛️Retirement & Government Schemes
Retirement Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator →🧾Tax & Salary
Reverse Tax Calculator
Net = Gross x 100 / (100 + rate); Tax = Gross - Net
Open calculator →🔢Mathematics
Rounding Calculator
Round to the chosen number of decimal places
Open calculator →🎓Education
SGPA Calculator
GPA = sum(grade point x credit) / sum(credit)
Open calculator →🎓Education
SGPA to Percentage Converter
Percentage = CGPA x factor (commonly 9.5 for CBSE)
Open calculator →📈Finance & Investment
SWP Calculator
Each month: balance = balance x (1 + r/12) - withdrawal
Open calculator →🧾Tax & Salary
Salary Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator →🧾Tax & Salary
Salary Hike Calculator
New = Current x (1 + hike/100)
Open calculator →🧾Tax & Salary
Salary Tax Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator →🧱Construction & Materials
Sand Calculator
Volume = L x W x D; Weight = volume x density
Open calculator →💳Banking & Deposits
Savings Account Interest Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator →📐Geometry & Measurement
Scale Calculator
Scaled length = real length / scale factor
Open calculator →🧮General Calculators
Scientific Calculator
Safely evaluate the mathematical expression
Open calculator →📈Finance & Investment
Simple Interest Calculator
SI = P x R x T / 100; Maturity = P + SI
Open calculator →🔢Mathematics
Simplification Calculator
Symbolic algebra: simplify, expand, differentiate or evaluate the expression
Open calculator →🔢Mathematics
Simultaneous Equations Solver
Solve a1x+b1y=c1 and a2x+b2y=c2 by Cramer's rule
Open calculator →🔢Mathematics
Sine Calculator
Evaluate sin/cos/tan of the angle (degrees converted to radians)
Open calculator →📐Geometry & Measurement
Slope Calculator
m = (y2 - y1) / (x2 - x1)
Open calculator →🔄Converters
Speed Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →🚗Travel & Automotive
Speed-Distance-Time Calculator
distance = speed x time (leave the unknown as 0)
Open calculator →💰Personal Finance
Spending Calculator
Net worth = total assets - total liabilities
Open calculator →📐Geometry & Measurement
Square Calculator
Area = side^2; Perimeter = 4 x side; Diagonal = side x sqrt(2)
Open calculator →🔄Converters
Square Feet to Square Yards Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →📐Geometry & Measurement
Square Footage Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator →🔄Converters
Square Inches to Square Feet Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →📐Geometry & Measurement
Square Meter Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator →🔢Mathematics
Square Root Calculator
result = value^(1/root)
Open calculator →🧱Construction & Materials
Stair Calculator
Steps = round(total rise / ideal riser); riser = total rise / steps
Open calculator →🧾Tax & Salary
Stamp Duty Calculator
Stamp duty = value x rate/100; registration = value x reg rate/100
Open calculator →📊Statistics & Data
Statistics Calculator
Compute mean, median, mode, sample standard deviation and range
Open calculator →📈Finance & Investment
Stock Average Calculator
Average = sum(price x qty) / sum(qty)
Open calculator →📈Finance & Investment
Stock Profit Calculator
ROI = (Final value - Amount invested) / Amount invested x 100
Open calculator →🏦Loans & EMI
Student Loan Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1)
Open calculator →🏛️Retirement & Government Schemes
Sukanya Samriddhi Yojana Calculator
Each yearly contribution compounds annually: M = sum of P x (1 + r)^(years remaining)
Open calculator →🏛️Retirement & Government Schemes
Superannuation Calculator
Future monthly expense grows with inflation; corpus = 25x annual expense (4% rule); SIP solves for that corpus.
Open calculator →📐Geometry & Measurement
Surface Area Calculator
Cube 6a^2; Sphere 4 pi r^2; Cylinder 2 pi r (r + h)
Open calculator →❤️Health & Fitness
TDEE Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator →🧾Tax & Salary
Take-Home Salary Calculator
In-hand = CTC - employer PF - employee PF - professional tax - other deductions (simplified)
Open calculator →🧾Tax & Salary
Tax Bracket Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator →🧾Tax & Salary
Tax Rate Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator →🧾Tax & Salary
Tax Return Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator →🔄Converters
Temperature Converter
C to F: F = C x 9/5 + 32; C to K: K = C + 273.15
Open calculator →📅Date & Time
Time Addition Calculator
Add the hours and minutes to the start time, wrapping over 24h
Open calculator →📅Date & Time
Time Duration Calculator
Duration = end - start - break (handles crossing midnight)
Open calculator →📈Finance & Investment
Time Value of Money Calculator
FV = PV x (1 + r)^t
Open calculator →📅Date & Time
Time Zone Calculator
Converted = time - fromOffset + toOffset (wrapped over 24h)
Open calculator →📅Date & Time
Timesheet Calculator
Total hours = hours x days; Pay = total hours x rate
Open calculator →⚡Engineering & Electrical
Torque Calculator
Torque = force x lever length
Open calculator →📐Geometry & Measurement
Triangle Area Calculator
Area = 1/2 x base x height
Open calculator →🔢Mathematics
Trigonometry Calculator
Evaluate sin/cos/tan of the angle (degrees converted to radians)
Open calculator →🔢Mathematics
Two's Complement Calculator
Parse from the source base and render in the target base
Open calculator →🔄Converters
Unit Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →❤️Health & Fitness
VO2 Max Calculator
VO2 max is about 15.3 x (max HR / resting HR)
Open calculator →⚡Engineering & Electrical
Voltage Divider Calculator
Vout = Vin x R2 / (R1 + R2)
Open calculator →⚡Engineering & Electrical
Voltage Drop Calculator
Vdrop = 2 x I x (resistivity x length / area)
Open calculator →📈Finance & Investment
WACC Calculator
WACC = E/V x Re + D/V x Rd x (1 - tax)
Open calculator →❤️Health & Fitness
Water Intake Calculator
Base = 35 ml x weight(kg) + activity adjustment
Open calculator →⚡Engineering & Electrical
Watts to Amps Calculator
I = P / (V x pf)
Open calculator →⚡Engineering & Electrical
Wavelength Calculator
wavelength = speed / frequency
Open calculator →📅Date & Time
Week Calculator
Count days between two dates and express in multiple units
Open calculator →🔄Converters
Weight Converter
result = value x (factor of 'from' unit) / (factor of 'to' unit)
Open calculator →❤️Health & Fitness
Weight Gain Calculator
TDEE +/- calorie adjustment for the goal
Open calculator →❤️Health & Fitness
Weight Loss Calculator
TDEE +/- calorie adjustment for the goal
Open calculator →🔢Mathematics
Weighted Average Calculator
Weighted average = sum(value x weight) / sum(weight)
Open calculator →💼Business & Commerce
Win Rate Calculator
Win rate = won / total x 100
Open calculator →📅Date & Time
Work Hours Calculator
Duration = end - start - break (handles crossing midnight)
Open calculator →📈Finance & Investment
XIRR Calculator
IRR is the discount rate that makes NPV = 0 (found numerically)
Open calculator →📅Date & Time
Year Calculator
Count days between two dates and express in multiple units
Open calculator →📈Finance & Investment
Yield Calculator
Current yield = annual income / current price x 100
Open calculator →⚡Engineering & Electrical
kVA to Amps Calculator
3ph: I = kVA x 1000 / (sqrt(3) x V); 1ph: I = kVA x 1000 / V
Open calculator →Find calculators by category
DigiToolkit organises 295 calculators into 18 categories. Whether you are planning a loan EMI, checking your BMI, converting units, computing GST or solving a maths problem, there is a dedicated tool with clear inputs, instant results and an explanation of the underlying formula.