BMR Calculator
BMR Calculator
Estimated BMR
1,649 kcal/day
Weight (kg)
70
Height (cm)
175
How calculations work
BMR (Basal Metabolic Rate) is estimated with the Mifflin–St Jeor formula using weight, height, age, and sex. The result approximates the number of kilocalories needed at rest to support basic physiological functions.
How to interpret results
Treat BMR as a resting baseline. Real daily needs depend on activity, health, and environment. This number is a starting point for further planning and not a clinical measurement.
Disclaimer
What this calculator does
Basal Metabolic Rate (BMR) estimates the kilocalories your body needs at rest to perform essential physiological functions. This tool uses the Mifflin–St Jeor equation and returns an approximate daily calorie baseline.
Who should use this calculator
People planning nutrition, fitness programs, or initial calorie targets — including dietitians and fitness enthusiasts who want a quick baseline. It is not a clinical diagnostic tool.
How this calculator works
The calculator applies the Mifflin–St Jeor formula using your age, sex, height, and weight to estimate resting energy expenditure. All math executes in the browser with no external data calls.
How to interpret your result
The output is an estimate of daily calories required at rest. Use it as a starting point for planning calories for weight maintenance; to estimate active-day needs multiply by an activity factor using the calorie calculator.
Example
For a 30-year-old 70 kg male at 175 cm, the Mifflin–St Jeor estimate might produce a BMR near 1,650 kcal/day. Use your exact inputs to get a personalised estimate.
Limitations & disclaimer
Estimates are approximate and do not replace medical or metabolic testing. Factors like body composition, illness, and genetics affect true energy needs. Consult a healthcare professional for personalised advice.