BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest — using the Mifflin-St Jeor equation.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
What is BMR?+
Basal Metabolic Rate is the number of calories you'd burn doing nothing all day. It's the baseline for working out your daily calorie needs.
Is this a substitute for medical advice?+
No. These calculators are for general information and education only. Consult a qualified healthcare professional for personal medical advice.
Is my data private?+
Yes. The tool runs entirely in your browser — nothing you paste or type is uploaded to a server.
Guides & deep dives
BMR: What It Is and How to Use It to Set Calorie Targets
Learn what BMR is, how Mifflin-St Jeor and Harris-Benedict differ, what factors raise or lower it, and how to build a real calorie target from your number.
BMI Explained: Categories, Limitations and What Yours Means
Understand BMI categories, the formula, why athletes skew results, Asian cutoffs, and what to actually do with your number. Clear, evidence-based guide.
How Many Calories Should You Eat? TDEE Explained
Learn how to calculate your TDEE, set the right calorie deficit or surplus, and adjust when progress stalls. Includes activity multipliers and worked examples.
Body Fat Percentage: Healthy Ranges and How to Measure It
Learn healthy body fat ranges by gender and age, compare measurement methods (Navy, calipers, DEXA), and understand what essential fat really means.