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Calorie Calculator

Calculate your daily calorie needs using the Mifflin-St Jeor formula based on age, gender, height, weight, and activity. Use this Fitness and training tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
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How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

This calculator uses the Mifflin-St Jeor equation, widely regarded as the most accurate formula for estimating Basal Metabolic Rate (BMR). Your Total Daily Energy Expenditure (TDEE) is then calculated by multiplying BMR by an activity factor. To lose weight, aim for 500 kcal below TDEE; to gain weight, aim for 500 kcal above.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions at rest, such as breathing and circulation.

What is TDEE?

Total Daily Energy Expenditure (TDEE) is your BMR multiplied by an activity factor, representing how many calories you burn in a day including physical activity.

How accurate is this calculator?

The Mifflin-St Jeor formula is considered the most accurate for most people, but individual metabolism can vary. Use the result as an estimate and adjust based on real-world results.