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Power and Energy

BTUtokcal

Convert International Table BTUs (BTU) to kilocalories (kcal).

Factor1 BTU = 0.2521644 kcal

Converter

BTU

Accepts numbers or expressions, e.g. 150 + 14.7

Result
25.2164kcal

Rendered to 6 significant figures.

Formula

Formula
kcal = BTU × 0.2521644

Multiply any value in International Table BTUs by 0.2521644 to obtain the value in kilocalories.

Worked example

Convert 100 BTU to kcal.

  1. 01Start with 100 BTU.
  2. 02Multiply by the conversion factor: 100 × 0.2521644 = 25.2164 kcal.
Result100 BTU = 25.2164 kcal

Conversion table

BTUkcal
10.25216
20.50433
51.2608
102.5216
205.0433
5012.608
10025.216
20050.433
500126.08
1000252.16

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU to kcal?
1 BTU equals 0.2521644 kcal. To convert, multiply the value in International Table BTUs by 0.2521644.
How do I convert 1 BTU to kcal?
1 BTU = 0.252164 kcal. For any value, multiply by 0.2521644.
How do I convert kcal back to BTU?
Divide by the same factor — or equivalently, multiply by 3.965667. So 1 kcal = 3.96567 BTU.
When would I need to convert International Table BTU to kilocalorie?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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