Free BMR Calculator — Basal Metabolic Rate
Estimate the calories your body burns at complete rest using the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formula, then see your TDEE for your activity level.
How to use the BMR Calculator
- Enter Details: Go to fixflowhub.com/bmr-calculator and enter your gender, age, height, and weight
- Pick a Formula: Choose Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle
- View Results: See your BMR and TDEE — the calories your body burns at rest and in total
Frequently Asked Questions
What is BMR and why does it matter?
BMR (Basal Metabolic Rate) is the number of calories your body needs to maintain basic functions at rest — breathing, circulation, and cell production. Knowing your BMR helps you set accurate calorie goals.
What is the difference between BMR and TDEE?
BMR is calories burned at rest. TDEE (Total Daily Energy Expenditure) is your BMR multiplied by your activity level — the total calories you burn daily including exercise.
How can I increase my BMR?
Build muscle mass through strength training, eat enough protein, stay hydrated, and get adequate sleep. Muscle tissue burns more calories at rest than fat tissue.