UnitConvConvert
Energy

Convert BTU to kilocalories

1 BTU=0.2522kcal

Use the converter below to change any BTU value into kilocalories instantly — with formula, conversion table, and real-world examples.

0.25216

Conversion formula

Forward
kilocalories = BTU × 0.2522
Reverse
BTU = kilocalories × 3.96567

Example: 10 BTU × 0.2522 = 2.52164 kcal.

About both units

From

British Thermal Unit

BTU

The British Thermal Unit equals approximately 1055 joules — the energy to raise 1 pound of water by 1 °F. Used for HVAC, heating, and air-conditioning capacity in the US. A 9000 BTU/h AC is a small room unit.

Real-world: Window AC: 5000–12,000 BTU/h. Central AC: 24,000–60,000 BTU/h. Home furnace: 60,000–100,000 BTU/h.
Read full british thermal unit reference →
To

Kilocalorie

kcal

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.

Real-world: Adult daily intake: ~2000 kcal. Banana: 90 kcal. Big Mac: 550 kcal. 30 min running: ~300 kcal burned.
Read full kilocalorie reference →

British Thermal Unit to Kilocalorie conversion table

Common BTU to kilocalories values for quick reference.

British Thermal Unit (BTU)Kilocalorie (kcal)
1 BTU0.2522 kcal
10 BTU2.52164 kcal
100 BTU25.2164 kcal
500 BTU126.082 kcal
1,000 BTU252.164 kcal
5,000 BTU1,260.82 kcal
10,000 BTU2,521.64 kcal
50,000 BTU12,608.22 kcal
100,000 BTU25,216.44 kcal
500,000 BTU126,082.2 kcal

Tips & common mistakes

Quick tips

  • 1 BTU = 1055.06 J = 0.293 Wh.
  • BTU/h (power) and BTU (energy) are different — don't confuse.
  • Tons of refrigeration: 12,000 BTU/h = 1 ton AC.

Avoid these

  • Confusing BTU and BTU/h — energy vs power.
  • Using kcal when BTU is requested in HVAC specs.
  • Treating all BTUs as exact — definitions vary (IT, thermochemical, etc.).

Frequently asked questions

How many kilocalories in a british thermal unit?
One british thermal unit equals 0.2522 kilocalories.
How do I convert BTU to kilocalories?
Multiply the british thermal unit value by 0.2522 to get the equivalent in kilocalories.
What is 100 BTU in kilocalories?
100 BTU equals 25.2164 kilocalories.
Is a british thermal unit bigger than a kilocalorie?
No. 1 british thermal unit equals 0.2522 kilocalories, so one british thermal unit is smaller.
How to convert BTU to kilocalories without a calculator?
Multiply by 0.25 for a quick estimate; use a calculator for precise results.

Related energy conversions

📊 See full comparison matrix →

More from British Thermal Unit

BTU → J
1 = 1,055.06 J
BTU → kJ
1 = 1.05506 kJ
BTU → MJ
1 = 0.001055 MJ
BTU → kWh
1 = 0.0002931 kWh
BTU → Wh
1 = 0.2931 Wh
BTU → cal
1 = 252.164 cal
BTU → eV
1 = 6.5851e21 eV
BTU → thm
1 = 1.0000e-5 thm

More to Kilocalorie

J → kcal
1 = 0.000239 kcal
kJ → kcal
1 = 0.239 kcal
MJ → kcal
1 = 239.006 kcal
kWh → kcal
1 = 860.421 kcal
Wh → kcal
1 = 0.8604 kcal
cal → kcal
1 = 0.001 kcal
eV → kcal
1 = 3.8293e-23 kcal
thm → kcal
1 = 25,216.44 kcal

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourPressureBar → Pound per Square InchPowerKilowatt → Mechanical Horsepower