Calorie Calculator

Estimate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation, based on your weight, height, age, sex, and activity level.

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This calculator estimates your daily calorie needs (TDEE) and resting metabolic rate (BMR) using the Mifflin-St Jeor equation, based on your weight, height, age, sex, and activity level.

Weight *

Height *

Age *

years

Sex

Male

Female

Activity level *

Your result

2,507 kcal/day

Daily calorie needs (TDEE)

Basal Metabolic Rate (BMR)1,618 kcal/day

AI explanation

Formula

Men: BMR = 10×weight + 6.25×height − 5×age + 5. Women: BMR = 10×weight + 6.25×height − 5×age − 161. TDEE = BMR × activity multiplier

Worked example

Male, 75kg, 175cm, age 30, moderately active

Worked example: Male, 75kg, 175cm, age 30, moderately active
Field	Value
Weight	75
Height	175
Age	30
Sex	male
Activity level	moderate
Basal Metabolic Rate (BMR)	1699
Daily calorie needs (TDEE)	2633

Assumptions

Uses the Mifflin-St Jeor equation, widely regarded as more accurate than the older Harris-Benedict equation for most adults.
Activity multipliers are standard estimates (1.2 to 1.9) and may not precisely reflect your actual energy expenditure.
Informational only — not personalized medical or dietary advice.

Frequently asked questions

What is the difference between BMR and TDEE?

BMR is the calories your body burns at complete rest just to maintain basic functions. TDEE adds your activity level on top of BMR to estimate total daily calorie needs.

Should I eat exactly my TDEE every day?

Eating at TDEE is intended to maintain your current weight. Eating below TDEE typically results in weight loss and above TDEE in weight gain, but individual results vary — consult a nutritionist for a personalized plan.

Why do men and women have different BMR formulas?

The Mifflin-St Jeor equation includes a sex-specific constant because men generally have more lean muscle mass relative to body weight, which increases resting energy expenditure.

Related calculators

Sources

A new predictive equation for resting energy expenditure in healthy individuals (Mifflin-St Jeor) — American Journal of Clinical Nutrition. Effective 01-02-1990, reviewed 12-09-2026.

This calculator provides a general estimate only and does not constitute personalized medical, nutritional, or fitness advice. Consult a qualified healthcare professional or registered dietitian before making significant changes to your diet.

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