BMR & Calorie Calculator

Estimate basal metabolic rate (Mifflin–St Jeor) and daily calories to maintain weight from sex, age, height, weight and activity level.

years
The equation was developed for adults (19–78 years in the original study).
Calories to maintain weight (TDEE)
2,556
Per day. An estimate: actual needs can differ by 10% or more.
Basal metabolic rate (BMR)
1,649
Per day, at complete rest.
Activity multiplier
1.55

Estimate generated with SortedSums: https://sortedsums.com/bmr-calorie-calculator/. For informational purposes only; verify before relying on it.

Estimate only. This tool is for informational and educational purposes. Results depend on your inputs and simplifying assumptions, and are not a substitute for professional engineering, design or financial advice. Always verify with a qualified professional and applicable codes before purchasing, building or making decisions.

How it’s calculated

Basal metabolic rate (BMR) is the energy your body uses at complete rest. The Mifflin–St Jeor equation (1990) estimates it from weight in kilograms, height in centimeters, age in years and sex. A systematic review found it the most accurate of the common prediction equations for healthy adults. Multiplying by an activity factor gives an estimate of total daily energy expenditure (TDEE), the calories needed to keep your weight stable.

Men: BMR = 10 × weight + 6.25 × height − 5 × age + 5 Women: BMR = 10 × weight + 6.25 × height − 5 × age − 161 TDEE = BMR × activity factor (1.2 to 1.9)

Example: a 30-year-old man, 175 cm and 70 kg. BMR = 700 + 1,093.75 − 150 + 5 = 1,649 kcal/day. Moderately active (× 1.55): TDEE = 1,648.75 × 1.55 ≈ 2,556 kcal/day.

The activity factors are conventional approximations. Prediction equations can be off by 10% or more for an individual, especially for very muscular people, older adults, during pregnancy or with medical conditions. This is an estimate for general information, not medical or dietary advice. Talk to a doctor or registered dietitian before changing your diet.

Frequently asked questions

What is the difference between BMR and TDEE?

BMR is energy used at complete rest. TDEE adds the energy for daily activity and exercise, so it is the figure to compare with what you eat.

How many calories should I eat to lose weight?

Eating less than your TDEE causes weight loss over time, but the body adapts and needs vary. The NIH Body Weight Planner models this more accurately; ask a healthcare provider for personal advice.

Is a kilocalorie the same as a food Calorie?

Yes. Nutrition labels use Calories (capital C), which are kilocalories. 1 kcal = 4.184 kJ.

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Sources

Formulas are taken from the free public references above. Results are provided “as is” for informational and educational purposes only. See our disclaimer.

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