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Heat Transfer

BTU/(hr·ft²)tocal/(cm²·s)

Convert British thermal units per hour-square foot (BTU/(hr·ft²)) to calories per square centimetre-second (cal/(cm²·s)).

Factor1 BTU/(hr·ft²) = 7.539653e-5 cal/(cm²·s)

Converter

BTU/(hr·ft²)

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

Result
7.53965cal/(cm²·s)

Rendered to 6 significant figures.

Formula

Formula
cal/(cm²·s) = BTU/(hr·ft²) × 7.539653e-5

Multiply any value in British thermal units per hour-square foot by 7.539653e-5 to obtain the value in calories per square centimetre-second.

Worked example

Convert 100000 BTU/(hr·ft²) to cal/(cm²·s).

  1. 01Start with 100000 BTU/(hr·ft²).
  2. 02Multiply by the conversion factor: 100000 × 7.539653e-5 = 7.53965 cal/(cm²·s).
Result100000 BTU/(hr·ft²) = 7.53965 cal/(cm²·s)

Conversion table

BTU/(hr·ft²)cal/(cm²·s)
17.5397e-5
20.00015079
50.00037698
100.00075397
200.0015079
500.0037698
1000.0075397
2000.015079
5000.037698
10000.075397

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²) to cal/(cm²·s)?
1 BTU/(hr·ft²) equals 7.539653e-5 cal/(cm²·s). To convert, multiply the value in British thermal units per hour-square foot by 7.539653e-5.
How do I convert 1 BTU/(hr·ft²) to cal/(cm²·s)?
1 BTU/(hr·ft²) = 7.53965e-5 cal/(cm²·s). For any value, multiply by 7.539653e-5.
How do I convert cal/(cm²·s) back to BTU/(hr·ft²)?
Divide by the same factor — or equivalently, multiply by 13263.21. So 1 cal/(cm²·s) = 13263.2 BTU/(hr·ft²).
When would I need to convert British thermal unit per hour-square foot to calorie per square centimetre-second?
Heat-flux conversions between BTU/(hr·ft²) and cal/(cm²·s) appear in radiative-heat-transfer analysis, furnace and reactor design, electronics cooling, and solar-energy calculations. W/m² is the SI standard; BTU/(hr·ft²) and kcal/(hr·m²) appear in US and legacy European datasheets.
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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