The TDEE Calculator is a free tool that helps you calculate tdee using the formula TDEE = BMR (Mifflin-St Jeor) x activity factor. Enter your values above and press Calculate to get tdee, bmr instantly, with a full step-by-step breakdown.
What is the TDEE Calculator?
The tdee calculator is a free online tool that helps you calculate tdee quickly and accurately. It applies the standard formula TDEE = BMR (Mifflin-St Jeor) x activity factor to the values you enter and, when you press Calculate, displays the result together with a clear, step-by-step explanation of how the answer was reached.
Also known as: tdee.
How to use the TDEE Calculator
- Choose gender.
- Enter age, weight, height.
- Select your activity level.
- See your maintenance calories.
Formula used
The tdee calculator is based on this formula:
TDEE = BMR (Mifflin-St Jeor) x activity factorEach term in the formula corresponds to one of the inputs explained below. The calculator performs the arithmetic for you and shows every step so you can check the working by hand if you wish.
Worked example
Suppose you enter Male, 30y, 70kg, 170cm, moderate. The calculator works as follows:
| Inputs | Male, 30y, 70kg, 170cm, moderate |
|---|---|
| Working | 1617 x 1.55 |
| Result | TDEE about 2506 kcal/day |
Step-by-step calculation
- Apply the formula:
TDEE = BMR (Mifflin-St Jeor) x activity factor - Substitute your values: 1617 x 1.55
- Read the result: TDEE about 2506 kcal/day
Activity multipliers (Mifflin-St Jeor)
| Activity level | Multiplier (× BMR) |
|---|---|
| Sedentary | 1.2 |
| Lightly active | 1.375 |
| Moderately active | 1.55 |
| Very active | 1.725 |
| Extra active | 1.9 |
Inputs explained
- Gender — the gender used in the calculation.
- Age (years) — the age used in the calculation.
- Weight (kg) — the weight used in the calculation.
- Height (cm) — the height used in the calculation.
- Activity level — the activity level used in the calculation.
Understanding your result
- TDEE — the calculated tdee in kcal/day.
- BMR — the calculated bmr in kcal/day.
Benefits and practical uses
The tdee calculator saves time and removes the risk of manual errors when you need to calculate tdee. It is useful for students, professionals and anyone who wants a fast, dependable answer. Results update the moment you press Calculate, work on any device, and can be copied or shared in a single click — and because the maths runs in your browser, your figures stay completely private.
Tips for an accurate result
- Keep all related inputs in the same units.
- Use the worked example above to confirm you are entering values in the right places.
- Review the assumptions below so the result fits your situation.
- Press Reset to clear everything and try a different scenario.
Common mistakes to avoid
- Entering values in the wrong unit (mismatched units give wrong answers).
- Leaving a required field empty — the calculator will ask you to fill it in.
- Treating the result as a diagnosis instead of a general guide.
Assumptions and limitations
- Mifflin-St Jeor BMR.
- Activity factor is an estimate.
Frequently asked questions
What is TDEE?
Total Daily Energy Expenditure - the calories you burn per day including activity. Eat below it to lose weight, above to gain.
How do I use the TDEE Calculator?
Enter your values in the fields, then press the Calculate button to see the result. Use Reset to clear the form and start again. Nothing is calculated until you click Calculate.
What formula does the TDEE Calculator use?
It uses the standard formula: TDEE = BMR (Mifflin-St Jeor) x activity factor. The full step-by-step working is shown with every result so you can verify it.
What information do I need to use the tdee calculator?
You need: gender, age, weight, height, activity level. Sensible example values are pre-filled so you can see how it works.
Is the TDEE Calculator free to use?
Yes. Every DigiToolkit calculator is completely free, with no sign-up, no login and no usage limits.
Does the TDEE Calculator work on mobile phones?
Yes. The calculator is mobile-first and works on phones, tablets and computers in any modern browser.
Do I need to install an app?
No. The tdee calculator runs directly in your web browser — there is nothing to download or install.
Is my data private when I use this calculator?
Yes. All calculations run inside your browser. The numbers you enter are never uploaded to a server or shared with anyone.
How accurate is the TDEE Calculator?
It uses the generally accepted formula for tdee and computes to several decimal places. Results are accurate for the assumptions listed on this page.
Can I copy or share my result?
Yes. After calculating, use the Copy button to copy the result, or Share to copy the page link.
Why is nothing showing until I press Calculate?
By design, the calculator only computes when you press Calculate, so you can finish entering all your values first. Press Reset any time to clear everything.
What units does the TDEE Calculator use?
It works with cm, kg, years. Keep your inputs in consistent units for an accurate result.