Basal Metabolic Rate Calculator

This basal metabolic rate calculator uses the formula for Basal Metabolic Rate (BMR) devised by doctors at the University of Nevada Medical School and published in the American Journal of Clinical Nutrition in 1990. It includes the Harris Benedict activity multiplier to determine overall calorie needs.

Use this calculator to find out your calorie intake to lose weight.

Basal Metabolic Rate

The first figure tells you what your minimum calorie needs are. It tells you how many calories your body needs to maintain its vital functions like breathing, processing food and pumping blood. Dropping below this figure will lower your metabolism as your body tries to conserve energy and hang on to its calories.

Average Daily Calorie Needs

The second figure tells you how many calories you need to eat in a day to maintain your current weight. Increasing activity increases your body’s calorie needs. This is only an indication, other factors such as muscle mass and testosterone levels come into play.

Calorie Intake to Lose Weight

All things being equal, increasing your average daily calorie needs through activity gives you a bigger margin to play with when wanting to lose weight. The difference between the two figures gives the number of calories you can safely reduce.

Fill out the fields in the form below and click “calculate my calorie needs” to get your BMR and your daily calorie needs.

Basal Metabolic Rate Calculator *


(in years)



Activity Level:

Your Basal Metabolic Rate is:

Your Average Daily Calorie Need is:

Other Calculators and Charts:

  • BMI Calculator Chart

* Based on Daily Calorie Needs Calculator (license)