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What is a kilocalorie?

The food-energy unit — 1 kcal = 4184 J (the nutrition "Calorie")

Definition

The kilocalorie equals 1000 small calories or 4184 joules. This is the nutrition "Calorie" (capital C in some US labels). EU and UK labels always say kcal; US labels say Calories. Adult daily intake is about 2000 kcal.

Common uses

  • Nutrition labels worldwide
  • Diet and weight-management tracking
  • Dietetics and clinical nutrition

🌍 Real-world scale

Adult daily intake: ~2000 kcal. Banana: 90 kcal. Big Mac: 550 kcal. 30 min running: ~300 kcal burned.

Convert from kilocalories

9 conversions
Kilocalorie to Joule1 kcal = 4,184 JKilocalorie to Kilojoule1 kcal = 4.184 kJKilocalorie to Megajoule1 kcal = 0.004184 MJKilocalorie to Kilowatt-Hour1 kcal = 0.001162 kWhKilocalorie to Watt-Hour1 kcal = 1.16222 WhKilocalorie to Calorie1 kcal = 1,000 calKilocalorie to British Thermal Unit1 kcal = 3.96567 BTUKilocalorie to Electronvolt1 kcal = 2.6114e22 eVKilocalorie to Therm1 kcal = 3.9657e-5 thm

Convert to kilocalories

9 conversions
Joule to Kilocalorie1 J = 0.000239 kcalKilojoule to Kilocalorie1 kJ = 0.239 kcalMegajoule to Kilocalorie1 MJ = 239.006 kcalKilowatt-Hour to Kilocalorie1 kWh = 860.421 kcalWatt-Hour to Kilocalorie1 Wh = 0.8604 kcalCalorie to Kilocalorie1 cal = 0.001 kcalBritish Thermal Unit to Kilocalorie1 BTU = 0.2522 kcalElectronvolt to Kilocalorie1 eV = 3.8293e-23 kcalTherm to Kilocalorie1 thm = 25,216.44 kcal

Tips

  • 1 kcal = 4.184 kJ.
  • US "Calorie" (with capital C) = 1 kcal.
  • Apps and smartwatches track active energy in kcal.

Common mistakes

  • Reading food "Calories" as gram calories — factor of 1000 off.
  • Treating all calorie values as comparable — macros (fat, protein, carb) differ in energy density.
  • Counting kcal without portion size leads to underestimates.

FAQ about the kilocalorie

What is a kilocalorie?
The kilocalorie equals 1000 small calories or 4184 joules. This is the nutrition "Calorie" (capital C in some US labels). EU and UK labels always say kcal; US labels say Calories. Adult daily intake is about 2000 kcal.
Where is the kilocalorie used?
The kilocalorie is commonly used for: Nutrition labels worldwide; Diet and weight-management tracking; Dietetics and clinical nutrition.
What is an example of a kilocalorie in real life?
Adult daily intake: ~2000 kcal. Banana: 90 kcal. Big Mac: 550 kcal. 30 min running: ~300 kcal burned.
What category does the kilocalorie belong to?
The kilocalorie is a unit of energy, part of the 10-unit energy category on UnitConv.
How accurate are kilocalorie conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 10 energy units and their conversions.⚡ Energy hub →