BMR Calculator

Estimate basal metabolic rate from age, sex, height, and weight.

BMR Calculator helps you basal metabolic rate using the Mifflin–St Jeor equation. Enter age, height (feet), height (inches), height (cm), and weight, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the BMR calculator does BMR Calculator is built for body measurements, calories, and everyday health math. Basal metabolic rate using the Mifflin–St Jeor equation. You enter age, height (feet), height (inches), height (cm), and weight, then Simple Calculators computes the result instantly. These tools use widely published formulas. They are educational screens, not a diagnosis. How the math works Mifflin–St Jeor: 10w + 6.25h − 5a + s, with weight in kg, height in cm, age in years, and s = +5 (male) or −161 (female). The formula: BMR = 10 × weight + 6.25 × height − 5 × age + s. Weight in kg, height in cm, age in years. s is the sex constant: +5 for men, −161 for women.