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Glossary Health & Fitness

Calorie

A calorie, as used for food, is a kilocalorie (kcal): the energy to raise 1 kg of water by about 1 °C, equal to 4.184 kilojoules.

Last reviewed: 2026-10-03

In more detail

2,000 kcal is 8,368 kJ. Exercise energy is estimated as MET × kg × hours: 5 METs for an hour at 70 kg burns 350 kcal.

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Calories to Joules Converter

Instantly convert calorie to joule, kcal to kJ, and food Calories to kilojoules with exact 4.184 factor.

Calories Burned Calculator

Calculate calories burned during exercise using MET (Metabolic Equivalent of Task) values for common activities.

Steps to Calories & Miles Calculator

Convert a daily step count into an estimated distance walked and calories burned, based on your height and weight.

See also

Glossary Macronutrients
Macronutrients are the nutrients needed in large amounts: protein and carbohydrate (4 kcal per gram each) and fat (9 kcal per gram).
Glossary TDEE
TDEE is total daily energy expenditure: the calories you burn in a day including movement, found by multiplying BMR by an activity factor.

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