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Heat Transfer

kW/m²toBTU/(hr·ft²)

Convert kilowatts per square metre (kW/m²) to British thermal units per hour-square foot (BTU/(hr·ft²)).

Factor1 kW/m² = 316.9983 BTU/(hr·ft²)

Converter

kW/m²

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

Result
316.998BTU/(hr·ft²)

Rendered to 6 significant figures.

Formula

Formula
BTU/(hr·ft²) = kW/m² × 316.9983

Multiply any value in kilowatts per square metre by 316.9983 to obtain the value in British thermal units per hour-square foot.

Worked example

Convert 1 kW/m² to BTU/(hr·ft²).

  1. 01Start with 1 kW/m².
  2. 02Multiply by the conversion factor: 1 × 316.9983 = 316.998 BTU/(hr·ft²).
Result1 kW/m² = 316.998 BTU/(hr·ft²)

Conversion table

kW/m²BTU/(hr·ft²)
1317
2634
51585
103170
206340
5015850
10031700
20063400
5001.5850e+5
10003.1700e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kW/m² to BTU/(hr·ft²)?
1 kW/m² equals 316.9983 BTU/(hr·ft²). To convert, multiply the value in kilowatts per square metre by 316.9983.
How do I convert 1 kW/m² to BTU/(hr·ft²)?
1 kW/m² = 316.998 BTU/(hr·ft²). For any value, multiply by 316.9983.
How do I convert BTU/(hr·ft²) back to kW/m²?
Divide by the same factor — or equivalently, multiply by 0.003154591. So 1 BTU/(hr·ft²) = 0.00315459 kW/m².
When would I need to convert kilowatt per square metre to British thermal unit per hour-square foot?
Heat-flux conversions between kW/m² and BTU/(hr·ft²) 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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