Free Online Calculators for Everything
Instantly calculate finance, health, maths, conversions, dates, tax, engineering and everyday numbers โ accurate, fast and free.
Popular Calculators
The tools people reach for most
Fixed Deposit Calculator
A = P x (1 + r/n)^(n x t)
Open calculator โDiscount Calculator
Saving = Price x discount/100; Final = Price - Saving
Open calculator โCurrency Converter
Converted = amount x exchange rate
Open calculator โAge Calculator
Difference between the two dates expressed in years, months and days
Open calculator โDate Difference Calculator
Count days between two dates and express in multiple units
Open calculator โCompound Interest Calculator
A = P x (1 + r/n)^(n x t); Interest = A - P
Open calculator โSimple Interest Calculator
SI = P x R x T / 100; Maturity = P + SI
Open calculator โBMI Calculator
BMI = weight(kg) / height(m)^2
Open calculator โBrowse by Category
Every calculator, neatly organised
64 calculators๐Finance & Investment
42 calculatorsโค๏ธHealth & Fitness
26 calculators๐Converters
23 calculators๐Geometry & Measurement
22 calculatorsโกEngineering & Electrical
18 calculators๐งพTax & Salary
18 calculators๐ Date & Time
16 calculators๐ฆLoans & EMI
15 calculators๐ผBusiness & Commerce
10 calculators๐๏ธRetirement & Government Schemes
10 calculators๐งฎGeneral Calculators
7 calculators๐งฑConstruction & Materials
5 calculators๐Education
5 calculators๐Travel & Automotive
5 calculators๐ณBanking & Deposits
4 calculators๐Statistics & Data
4 calculators๐ฐPersonal Finance
1 calculators
Featured Calculators
Handy tools worth bookmarking
Lumpsum Calculator
FV = P x (1 + r)^t
Open calculator โCAGR Calculator
CAGR = (End / Begin)^(1/years) - 1
Open calculator โScientific Calculator
Safely evaluate the mathematical expression
Open calculator โArea Calculator
Area = length x width; Perimeter = 2 x (length + width)
Open calculator โBMI Calculator
BMI = weight(kg) / height(m)^2
Open calculator โTDEE Calculator
TDEE = BMR (Mifflin-St Jeor) x activity factor
Open calculator โEMI Calculator
EMI = P x r x (1+r)^n / ((1+r)^n - 1), where r = monthly rate, n = months
Open calculator โAverage Calculator
Mean = sum of values / count
Open calculator โRecently Added
Fresh tools on DigiToolkit
Speed-Distance-Time Calculator
distance = speed x time (leave the unknown as 0)
Open calculator โAverage Speed Calculator
Average speed = total distance / total time
Open calculator โMileage Calculator
Mileage = distance / fuel used
Open calculator โHaversine Distance Calculator
Haversine formula on the Earth's radius (6371 km)
Open calculator โDistance Calculator
Haversine formula on the Earth's radius (6371 km)
Open calculator โReverse Tax Calculator
Net = Gross x 100 / (100 + rate); Tax = Gross - Net
Open calculator โStamp Duty Calculator
Stamp duty = value x rate/100; registration = value x reg rate/100
Open calculator โSalary Tax Calculator
Tax computed using slab rates; cess = 4% of tax. New-regime FY 2024-25 slabs applied by default.
Open calculator โWhy use DigiToolkit?
- โ Genuinely free โ no paywalls, sign-ups or limits.
- โ Accurate formulas โ every tool shows its formula and a worked example.
- โ Private โ calculations run in your browser; your numbers never leave your device.
- โ Fast & mobile-first โ instant results, optimised for phones.
- โ Accessible โ keyboard-friendly with screen-reader support.
How the calculators work
- Enter your values in clearly labelled fields with units.
- See the result instantly โ no page reload required.
- Review the breakdown โ formula, steps and a worked example.
- Copy or share your result, or explore related calculators.
Frequently Asked Questions
Are the DigiToolkit calculators free?
Yes. Every calculator on DigiToolkit is completely free to use, with no sign-up, no app download and no usage limits.
Do the calculators work on mobile?
Yes. All calculators are mobile-first and fully responsive, so they work smoothly on phones, tablets and desktops.
How accurate are the results?
Each calculator uses the standard, generally accepted formula for its purpose and shows the formula, a worked example and a step-by-step breakdown so you can verify the result.
Is my data stored?
No. Calculations run entirely in your browser. The values you enter are never sent to a server or to analytics platforms.