BMR Calculator: The Complete Guide
Discover how many calories your body burns just to keep you alive. Enter your age, sex, height, and weight to calculate your Basal Metabolic Rate (BMR) with the accurate Mifflin-St Jeor equation.
Who the BMR Calculator is for
People planning nutrition or weight goals who need their resting calorie burn as a baseline.
How to use the BMR Calculator
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
Mifflin-St Jeor: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5 for men (or − 161 for women). It estimates the energy your body uses at complete rest.
Features
- Mifflin-St Jeor equation
- Metric or imperial
- Male & female formulas
- Instant result
BMR vs. TDEE
Your Basal Metabolic Rate is the energy your body uses at rest for breathing, circulation, and cell function — roughly 60–70% of daily calories. Add the energy you spend moving and digesting and you get your Total Daily Energy Expenditure (TDEE). Knowing BMR is the first step to setting calorie targets for losing, maintaining, or gaining weight.