BMR Calculator
Estimates the calories your body uses at rest in a day.
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The formula
Mifflin-St Jeor: 10w + 6.25h − 5a + 5 (men) or − 161 (women) Harris-Benedict, men: 88.362 + 13.397w + 4.799h − 5.677a Harris-Benedict, women: 447.593 + 9.247w + 3.098h − 4.330a
w is weight in kg, h is height in cm and a is age in years.
What to watch out for
Mifflin, St Jeor and colleagues published their equation in 1990 from 498 healthy adults aged 19 to 78. Harris and Benedict published theirs in 1919, and the version here is the 1984 revision by Roza and Shizgal.
A 2005 review by Frankenfield and colleagues found Mifflin-St Jeor the most reliable of the common equations in both non-obese and obese adults, so it is the headline figure. Neither knows your muscle mass, so very muscular people can read low. Neither applies to children or in pregnancy.
Frequently Asked Questions
What is my BMR at 30, 175 cm and 75 kg?
About 1,699 kcal a day for a man and 1,533 for a woman on Mifflin-St Jeor.
Why do the two equations differ?
They came from different groups of people, decades apart. For the same 30-year-old man, Harris-Benedict gives 1,763 kcal a day against 1,699.
Is BMR the same as my daily calorie need?
No. BMR is your use at rest. Your daily need also includes activity, which is what a TDEE figure adds.