Kilocalories to BTU Converter
Quick answer: To convert kilocalories to BTU, multiply by 3.965667. For example, 10 kcal is 39.65667 Btu. One kilocalorie equals 3.965667 Btu.
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Use the Kilocalories to BTU Converter
Kilocalories to BTU formula and what each symbol means
Btu = kcal × 3.965667
| Symbol | Meaning |
|---|---|
| kcal | Kilocalorie |
| Btu | British thermal unit |
Kilocalories to BTU examples
1 kcal
1 kcal × 3.965667 = 3.965667 Btu.
10 kcal
10 kcal × 3.965667 = 39.65667 Btu.
100 kcal
100 kcal × 3.965667 = 396.5667 Btu.
Kilocalories compared with BTU
One kcal is 3.966 times as large as one Btu, so your number gets bigger when you convert kilocalories to BTU and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About kilocalories and BTU
Kilocalorie (kcal): The thermochemical kilocalorie, exactly 4,184 joules, used for food energy. British thermal unit (Btu): International Table British thermal unit, 1,055.05585262 joules.
Where kilocalories to BTU conversions are used
Gas and heating are often billed in therms, BTU or megajoules. Engineering and physics calculations usually work in joules.
How to calculate Kilocalories to BTU step by step
- Enter the value in kcal (the starting unit).
- Multiply by 3.965667, because 1 kcal = 3.965667 Btu.
- The product is the value in Btu. To go back, divide by 3.965667 or multiply by 0.2521644.
Popular energy conversions
How to read your Kilocalories to BTU result
Quick estimate: multiply by about 4 to get BTU from kilocalories; this is within 0.9% of the exact factor. Food labels use the kilocalorie (kcal, written Calorie in the US), electricity bills use the kilowatt hour, and heating uses the Btu.
| KILOCALORIES | BTU |
|---|---|
| 1 | 3.965667 |
| 2 | 7.931334 |
| 5 | 19.82833 |
| 10 | 39.65667 |
| 20 | 79.31334 |
| 50 | 198.2833 |
| 100 | 396.5667 |
| 1,000 | 3,965.667 |
BTU to Kilocalories: quick table
| BTU | KILOCALORIES |
|---|---|
| 1 | 0.2521644 |
| 5 | 1.260822 |
| 10 | 2.521644 |
| 25 | 6.30411 |
| 50 | 12.60822 |
| 100 | 25.21644 |
| 250 | 63.0411 |
| 500 | 126.0822 |
Common mistakes when calculating Kilocalories to BTU
- Confusing kW (power) with kWh (energy).
- Dividing when you should multiply: from kcal to Btu multiply by 3.965667; from Btu to kcal divide by 3.965667.
Kilocalories to BTU FAQ
How many Btu are in 1 kcal?
1 kcal equals 3.965667 Btu.
How many kcal are in 1 Btu?
1 Btu equals 0.2521644 kcal.
Is 1 kcal = 3.965667 Btu an exact conversion?
Yes. The kilocalorie and the british thermal unit are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 3.965667 is just that ratio shown to 7 significant figures.
What is a british thermal unit (Btu)?
International Table British thermal unit, 1,055.05585262 joules.
How can I estimate kilocalories to BTU in my head?
Quick estimate: multiply by about 4 to get BTU from kilocalories; this is within 0.9% of the exact factor.
What is 75 kcal in BTU?
75 kcal = 297.425 Btu (since 75 × 3.965667).
What is 300 kcal in BTU?
300 kcal = 1,189.7 Btu (since 300 × 3.965667).
What is 12 kcal in BTU?
12 kcal = 47.588 Btu (since 12 × 3.965667).
How many decimals should I keep when converting kcal to Btu?
Match the precision of your original measurement. For example, 39.65667 Btu rounds to 39.7 Btu at 3 significant figures; keep more digits only for engineering or scientific work.
More in Energy converters
- Kilocalories to kJ Converter
- Joules to Kilocalories Converter
- Kilocalories to kWh Converter
- Joules to Calories Converter
- kJ to BTU Converter
- Joules to BTU Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors