# BMR & TDEE Calculator

> BMR and TDEE calculator: estimate your basal metabolic rate and daily calorie needs with the Mifflin St Jeor formula. Free, private, runs in your browser.

- **Canonical URL:** https://boringtoolskit.com/bmr-tdee-calculator/
- **Category:** Health
- **Evidence level:** authored-methodology
- **Reviewed:** July 2026
- **Last verified:** 2026-09-20
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Mifflin–St Jeor adult resting energy estimate: 10 × weight kg + 6.25 × height cm − 5 × age + sex term (+5 male, −161 female). TDEE multiplies estimated BMR by the selected activity factor.

## Worked example

For a 30-year-old male equation term at 80 kg and 180 cm, estimated BMR is 1,780 kcal/day; a 1.2 activity factor gives about 2,136 kcal/day TDEE.

## Assumptions

- The equation is limited to adults age 18–100 in this tool.
- Activity multipliers are rough population planning categories, not measured expenditure.
- Pregnancy, illness, medications, body composition, adaptive metabolism, and clinical conditions are not modeled.

## Common questions

### Is TDEE a calorie prescription?

No. It is a planning estimate and can differ substantially from measured individual needs.

### Why does the equation ask for a sex term?

The published equation contains sex-specific constants; this tool labels that mathematical input explicitly.

### Who should not use this estimate alone?

Children, pregnant people, people with medical conditions, and anyone making clinical nutrition decisions should seek qualified guidance.

## Related tools

- /bmi-calc/
- /calorie-calc/
- /body-fat-calculator/

## Sources

- [A new predictive equation for resting energy expenditure in healthy individuals](https://pubmed.ncbi.nlm.nih.gov/2305711/)

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*Local planning estimate. Verify current terms, rates, and policies before acting.*