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Power and Energy

kcal/hrtoBTU/hr

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

Factor1 kcal/hr = 3.968321 BTU/hr

Converter

kcal/hr

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

Result
3968.32BTU/hr

Rendered to 6 significant figures.

Formula

Formula
BTU/hr = kcal/hr × 3.968321

Multiply any value in kilocalories per hour by 3.968321 to obtain the value in British thermal units per hour.

Worked example

Convert 1000 kcal/hr to BTU/hr.

  1. 01Start with 1000 kcal/hr.
  2. 02Multiply by the conversion factor: 1000 × 3.968321 = 3968.32 BTU/hr.
Result1000 kcal/hr = 3968.32 BTU/hr

Conversion table

kcal/hrBTU/hr
13.9683
27.9366
519.842
1039.683
2079.366
50198.42
100396.83
200793.66
5001984.2
10003968.3

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kcal/hr to BTU/hr?
1 kcal/hr equals 3.968321 BTU/hr. To convert, multiply the value in kilocalories per hour by 3.968321.
How do I convert 1 kcal/hr to BTU/hr?
1 kcal/hr = 3.96832 BTU/hr. For any value, multiply by 3.968321.
How do I convert BTU/hr back to kcal/hr?
Divide by the same factor — or equivalently, multiply by 0.2519958. So 1 BTU/hr = 0.251996 kcal/hr.
When would I need to convert kilocalorie per hour to British thermal unit 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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