BMR Calculator
Estimate your Basal Metabolic Rate — calories burned at rest.
Result
Results are estimates for general information only and are not professional advice.
What is Basal Metabolic Rate?
Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to keep vital functions running — breathing, circulation, cell repair and keeping you warm. It typically accounts for the majority of the calories you use each day, before any movement or exercise is added.
How BMR is calculated
This calculator uses the Mifflin-St Jeor equation, one of the most accurate formulas in everyday use. It combines your sex, age, weight and height, since men, younger people and larger or taller bodies generally have a higher metabolic rate. The result is your daily calorie burn at rest.
How to use this calculator
Select your sex and enter your age, weight and height, then press Calculate to see your BMR in calories per day. To estimate the calories you actually need, multiply this figure by an activity factor — from about 1.2 if you are sedentary up to 1.9 if you are very active.
Why BMR matters
Knowing your BMR is the foundation of managing your weight: it tells you the minimum energy your body requires, so you rarely want to eat below it for long. Use it together with your activity level to set realistic calorie targets for losing, maintaining or gaining weight.
Frequently Asked Questions
What is the BMR Calculator?
Estimate your Basal Metabolic Rate — calories burned at rest. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the BMR Calculator?
The BMR Calculator asks for the following values (4): Gender, Age, Weight (kg), Height (cm). Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the BMR Calculator?
The BMR Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the BMR Calculator free, and do I need an account?
Yes. The BMR Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.