What is a normal BMR?
Typical adult values range from about 1,200 to 1,800 kcal a day for women and 1,500 to 2,100 for men, depending on size and age. A BMR well outside that range for your body size is worth discussing with a clinician.
BMR Calculator
Estimate the calories your body burns at rest each day, using the Mifflin-St Jeor equation that most dietitians use.
Runs in your browser — nothing is uploaded
About the BMR Calculator
Basal metabolic rate is the energy your body uses to keep you alive at complete rest: breathing, circulation, cell repair and temperature control. It is usually the largest part of daily energy expenditure, so knowing it is the first step in any calorie plan.
The Mifflin-St Jeor equation estimates BMR from weight, height, age and sex. It is the most accurate of the common formulas for most adults. Multiply the result by an activity factor to estimate your total daily needs, which the TDEE calculator does for you.
FAQ
BMR Calculator — frequently asked
Can I eat only my BMR to lose weight?
No. Eating at BMR is not safe or sustainable, and it leaves no energy for movement or daily life. Weight loss plans normally sit a moderate amount below total daily needs, not below resting needs.
Why does BMR fall with age?
Muscle mass tends to decline with age, and muscle is metabolically active. The equation accounts for age, but your own muscle mass changes the true number, so strength training helps keep your rate higher.
Is the formula accurate for everyone?
It is an estimate. Accuracy is typically within about 10 percent for many adults, but it does not account for body composition, hormones, thyroid conditions or medications. A metabolic test gives a direct measurement.
Does this use metric units?
Yes. Enter age in years, height in centimetres and weight in kilograms. Convert from pounds or feet and inches before entering the values.
Is my health data stored?
No. The calculation runs in your browser and nothing is saved or sent.
Related tools
TDEE CalculatorEstimate the calories you burn each day from basal metabolism and activity level, with targets for losing or gaining weight.BMI CalculatorEnter your height and weight in metric or imperial units to see your body mass index, its WHO category and the healthy weight range for your height.Protein Intake CalculatorFind your daily protein range from body weight and goal, and see how much each of four meals should contain.