Calorie Calculator

Estimate daily calorie needs from sex, age, height, weight, and activity level using the Mifflin-St Jeor equation.

861.7K uses Updated · 2026-05-25 Runs locally · zero upload
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How to Use Calorie Calculator

  1. Select sex because the Mifflin-St Jeor BMR equation uses different constants.
  2. Enter age, weight in kilograms, and height in centimeters.
  3. Choose the activity level that best reflects a normal week, not a single unusually active day.
  4. Calculate to see estimated daily calories, plus the BMR and TDEE values behind the answer.

Formula & Theory - Calorie Calculator

Men:   BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age + 5
Women: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age - 161
Daily calories = BMR x activity factor
  • The result estimates maintenance energy needs before adding a deliberate deficit or surplus.

Use Cases for Calorie Calculator

  • Building a first calorie target for meal planning.
  • Checking whether reported intake is far below or above estimated needs.
  • Comparing how activity level changes daily calorie requirements.

Frequently asked questions about Calorie Calculator

What inputs does Calorie Calculator need?

Select sex because the Mifflin-St Jeor BMR equation uses different constants.

How should I interpret the result?

The result estimates maintenance energy needs before adding a deliberate deficit or surplus.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.