Calorie Calculator

Calculate your daily calorie needs based on age, weight, height, gender, and activity level.

What Is a Calorie Calculator?

A calorie calculator estimates how many calories your body needs per day based on your BMR and activity level.

Formula Used

Mifflin–St Jeor Equation

  • Men: BMR = 10×weight + 6.25×height − 5×age + 5
  • Women: BMR = 10×weight + 6.25×height − 5×age − 161

Daily Calories = BMR × Activity Factor

Example

  • Age: 25
  • Gender: Male
  • Height: 170 cm
  • Weight: 70 kg
  • Activity: 1.55 (Moderately Active)

Daily Calories ≈ 2583 kcal/day

Input Rules & Limits

  • Age: 10 – 100 years
  • Height: 50 – 250 cm
  • Weight: 20 – 300 kg
  • Activity Level: 1.2 to 1.9 multiplier

Frequently Asked Questions

Yes, more activity increases calorie needs.
It provides a close estimate using scientific equations.
Yes, metabolism slows with age.