BMR Calculator (Harris-Benedict Equation)
Health & FitnessCalculate your Basal Metabolic Rate using the classic Harris-Benedict equation.
BMR (Harris-Benedict)
The number of calories your body needs to function at complete rest for 24 hours, using the classic Harris-Benedict equation.
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Frequently Asked Questions
What is the Harris-Benedict equation?
The Harris-Benedict equation is one of the earliest and most widely-used formulas for estimating Basal Metabolic Rate, developed in 1919 and later revised.
How is this different from Mifflin-St Jeor?
Both formulas estimate BMR from weight, height, age, and sex, but use different coefficients derived from different research populations. Mifflin-St Jeor is generally considered a somewhat more accurate modern alternative for most people, while Harris-Benedict remains a classic reference point still widely used.
Is BMR the same as the calories I need to maintain my weight?
No. BMR only covers energy needed at complete rest. To estimate total daily calorie needs, BMR is typically multiplied by an activity level factor.
How accurate is this estimate?
Like all BMR formulas, this is a population-based estimate. Individual metabolic rate can vary by 10 percent or more due to genetics, muscle mass, and other factors.
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