BMR Calculator
Estimate your Basal Metabolic Rate (BMR) — calories your body needs at rest to maintain basic functions.
What is BMR?
Basal Metabolic Rate (BMR) estimates how many calories your body burns each day at rest to keep basic functions running, such as breathing, circulation, and temperature regulation.
BMR formulas explained
This calculator uses the Mifflin-St Jeor equation as the primary estimate and can also show Harris-Benedict for comparison. If you provide a body fat percentage, it can estimate BMR using the Katch-McArdle formula based on lean mass.
BMR vs TDEE
BMR is your resting calorie burn. TDEE (Total Daily Energy Expenditure) estimates your daily maintenance calories after adding activity. If you select an activity level, this tool will show an optional TDEE estimate.
Frequently Asked Questions
Quick answers about BMR.
What is BMR?
BMR estimates the calories your body burns at rest to maintain basic functions.
How is BMR calculated?
This tool uses Mifflin-St Jeor (primary), with optional Harris-Benedict comparison and Katch-McArdle if body fat % is provided.
Which BMR formula is most accurate?
For general use, Mifflin-St Jeor is commonly recommended. Katch-McArdle can be helpful if you know body fat %.
What is the difference between BMR and TDEE?
BMR is calories burned at rest. TDEE includes activity and represents daily maintenance calories.
How many calories does my body burn at rest?
That’s what BMR estimates. Use the calculator for a personalized estimate based on age, sex, height, and weight.
Disclaimer
This calculator provides estimates for informational purposes only and does not provide medical advice. Consult a qualified professional for personalized guidance.