What it calculates
Basal metabolic rate (BMR) is the energy your body needs to keep running at rest — breathing, circulation and cell repair.
How it works
The calculator uses the Mifflin–St Jeor equation, which many dietitians use as a starting estimate, then shows daily energy use at standard activity levels.
Formula
BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + s
- s = +5 for males, −161 for females
How to use it
- Enter sex, age, height and weight.
- Read your BMR and the activity table.
For the defaults —
Why it helps
- Clearly identified, widely used equation.
- Activity table helps set calorie targets.
Limitations
- An estimate; measured metabolic rate can differ.
- Does not account for body composition.
Frequently asked questions
Is BMR the same as calories I need?
No. BMR is at rest; your daily need is higher because of activity. See the activity table or the Calorie Calculator.
Do you store what I enter?
No. This calculator runs entirely in your browser. Your measurements and dates are not sent to or stored on our servers.
Sources
- A new predictive equation for resting energy expenditure in healthy individuals — Mifflin MD, St Jeor ST, et al. American Journal of Clinical Nutrition, 1990 (checked 2026-09-27)
This calculator gives a general estimate only. It is not medical advice, a diagnosis or a treatment plan, and it does not replace a consultation with a doctor or registered dietitian. Your inputs stay in your browser and are not stored by UrbanFiling.