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Power and Energy

BTU/hrtokcal/hr

Convert British thermal units per hour (BTU/hr) to kilocalories per hour (kcal/hr).

Factor1 BTU/hr = 0.2519958 kcal/hr

Converter

BTU/hr

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

Result
251.996kcal/hr

Rendered to 6 significant figures.

Formula

Formula
kcal/hr = BTU/hr × 0.2519958

Multiply any value in British thermal units per hour by 0.2519958 to obtain the value in kilocalories per hour.

Worked example

Convert 1000 BTU/hr to kcal/hr.

  1. 01Start with 1000 BTU/hr.
  2. 02Multiply by the conversion factor: 1000 × 0.2519958 = 251.996 kcal/hr.
Result1000 BTU/hr = 251.996 kcal/hr

Conversion table

BTU/hrkcal/hr
10.252
20.50399
51.26
102.52
205.0399
5012.6
10025.2
20050.399
500126
1000252

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/hr to kcal/hr?
1 BTU/hr equals 0.2519958 kcal/hr. To convert, multiply the value in British thermal units per hour by 0.2519958.
How do I convert 1 BTU/hr to kcal/hr?
1 BTU/hr = 0.251996 kcal/hr. For any value, multiply by 0.2519958.
How do I convert kcal/hr back to BTU/hr?
Divide by the same factor — or equivalently, multiply by 3.968321. So 1 kcal/hr = 3.96832 BTU/hr.
When would I need to convert British thermal unit per hour to kilocalorie per hour?
Power conversions are common when comparing motor ratings (often kW or hp), thermal duty (BTU/hr or kW), and utility consumption in mixed-unit projects.
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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