About this calculator

Uses the Mifflin–St Jeor equation. BMR is calories burned at rest; multiplying by activity factor gives TDEE — the calories you need to maintain weight.

How it works

Enter your weight (kg), height (cm), age, sex and activity. The result updates as you type, using the formula shown below. Nothing you enter is stored.

Limits

Population formulas give estimates, not a medical diagnosis. Speak to a doctor before making big changes.

Who it's for

People tracking training, weight or nutrition goals.

Formula: BMR (M) = 10w + 6.25h − 5a + 5, (F) = 10w + 6.25h − 5a − 161

Frequently asked questions

What does the BMR & TDEE Calculator do?

Estimate Basal Metabolic Rate and Total Daily Energy Expenditure. Uses the Mifflin–St Jeor equation. BMR is calories burned at rest; multiplying by activity factor gives TDEE — the calories you need to maintain weight.

Is the BMR & TDEE Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the BMR & TDEE Calculator?

Results are calculated in real time using the formula BMR (M) = 10w + 6.25h − 5a + 5, (F) = 10w + 6.25h − 5a − 161. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified fitness & health professional before committing to a purchase or a job.

What inputs does the BMR & TDEE Calculator need?

Enter values for: Weight (kg), Height (cm), Age, Sex, Activity. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the BMR & TDEE Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.