# BMR & Calorie Calculator

> Estimate your basal metabolic rate and daily calorie needs using Mifflin-St Jeor.

To estimate your calorie needs, enter your age, sex, weight, height and activity level. Basal metabolic rate is calculated with the Mifflin-St Jeor equation, then multiplied by an activity factor to give total daily energy expenditure and targets for gradual weight change.

**URL:** https://convertto.tech/t/bmr-tdee-calculator
**Category:** Health & Fitness (https://convertto.tech/c/health-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Choose the units.
2. Choose the sex at birth.
3. Set the age.
4. Set the weight.
5. Set the height.
6. Choose the activity level.
7. The result appears immediately — copy or download it.

## FAQ

### How accurate is this?

Mifflin-St Jeor is the most accurate common equation, but individual metabolic rate varies by roughly 10% either way. Use the number as a starting point and adjust based on what actually happens over three to four weeks.

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