Your Basal Metabolic Rate (BMR) is the number of calories your body needs each day simply to stay alive — powering breathing, circulation and cell repair while you rest. This free BMR calculator uses the widely respected Mifflin-St Jeor equation to give you a quick, personalised estimate from your age, sex, height and weight. Please treat the result as a general estimate for information only; it is not medical advice.
This is a general estimate for information only and is not medical advice. For personalised guidance, please speak to a qualified health professional.
How to Use
- Enter your age in years.
- Choose your sex.
- Enter your height in centimetres and your weight in kilograms.
- Select “Calculate BMR” to see your estimated basal metabolic rate.
Key Features
- Built on the trusted Mifflin-St Jeor equation.
- Instant results with no sign-up required.
- Clearly labelled as a general estimate, not medical advice.
- Fully responsive on desktop and mobile.
FAQs
What is BMR?
BMR stands for Basal Metabolic Rate: the calories your body needs each day to maintain vital functions such as breathing and circulation while at rest.
How accurate is this estimate?
It is a general estimate based on a well-known formula. Individual metabolic rates vary, so use the figure as a guide rather than a medical measurement.
Does BMR include exercise?
No. BMR covers complete rest only. To estimate total daily calorie needs, BMR is usually multiplied by an activity factor.