BTU per hour square foot °F to Watts per square metre kelvin
1 BTU per hour square foot °F = 5.6783 watts per square metre kelvin · 1 W/(m²·K) = 0.17611 BTU/(h·ft²·°F)
1 BTU per hour square foot °F = 5.6783 watts per square metre kelvin
How it’s calculated
W/(m²·K) = BTU/(h·ft²·°F) × 5.678263341
- Multiply the value in BTU per hour square foot °F by 5.678263341.
- To go back, divide by 5.678263341 (or multiply by 0.1761101837).
- 1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K) · 1 W/(m²·K) = 0.1761101837 BTU/(h·ft²·°F)
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 BTU/(h·ft²·°F) = 5.67826334111349 W/(m²·K). Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).
Multiply by the factor written as a fraction
Put BTU/(h·ft²·°F) in the denominator so it cancels, leaving W/(m²·K).
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 5.6783 W/(m²·K)
1 BTU/(h·ft²·°F) in other units
Batch convert BTU/(h·ft²·°F) → W/(m²·K)
- 1 BTU/(h·ft²·°F) = 5.6783 W/(m²·K)
- 5 BTU/(h·ft²·°F) = 28.391 W/(m²·K)
- 10 BTU/(h·ft²·°F) = 56.783 W/(m²·K)
- 25 BTU/(h·ft²·°F) = 141.96 W/(m²·K)
Quick examples
- 1 BTU per hour square foot °F = 5.6783 watts per square metre kelvin
- 5 BTU per hour square foot °F = 28.391 watts per square metre kelvin
- 10 BTU per hour square foot °F = 56.783 watts per square metre kelvin
- 25 BTU per hour square foot °F = 141.96 watts per square metre kelvin
- 100 BTU per hour square foot °F = 567.83 watts per square metre kelvin
About these units
BTU per hour square foot °F (BTU/(h·ft²·°F))
US & imperial (identical)
IT BTU basis: ≈ 5.678 263 W/(m²·K). US U-factor unit.
1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K)
Source: NIST SP 811 / Handbook 44
Watt per square metre kelvin (W/(m²·K))
SI (metric)
SI unit of heat transfer coefficient and building U-value.
Base unit
Source: BIPM SI Brochure (9th ed.)
BTU per hour square foot °F to watts per square metre kelvin conversion table
| BTU per hour square foot °F (BTU/(h·ft²·°F)) | Watts per square metre kelvin (W/(m²·K)) |
|---|---|
| 0.1 BTU/(h·ft²·°F) | 0.56783 W/(m²·K) |
| 0.15 BTU/(h·ft²·°F) | 0.85174 W/(m²·K) |
| 0.2 BTU/(h·ft²·°F) | 1.1357 W/(m²·K) |
| 0.25 BTU/(h·ft²·°F) | 1.4196 W/(m²·K) |
| 0.3 BTU/(h·ft²·°F) | 1.7035 W/(m²·K) |
| 0.5 BTU/(h·ft²·°F) | 2.8391 W/(m²·K) |
| 1 BTU/(h·ft²·°F) | 5.6783 W/(m²·K) |
| 1.5 BTU/(h·ft²·°F) | 8.5174 W/(m²·K) |
| 2 BTU/(h·ft²·°F) | 11.357 W/(m²·K) |
| 5 BTU/(h·ft²·°F) | 28.391 W/(m²·K) |
| 10 BTU/(h·ft²·°F) | 56.783 W/(m²·K) |
| 25 BTU/(h·ft²·°F) | 141.96 W/(m²·K) |
| 50 BTU/(h·ft²·°F) | 283.91 W/(m²·K) |
| 100 BTU/(h·ft²·°F) | 567.83 W/(m²·K) |
| 1,000 BTU/(h·ft²·°F) | 5,678.3 W/(m²·K) |
Related conversions
Frequently asked questions
How do I convert BTU per hour square foot °F to watts per square metre kelvin?
Use W/(m²·K) = BTU/(h·ft²·°F) × 5.678263341. Multiply the value in BTU per hour square foot °F by 5.678263341.
How many watts per square metre kelvin are in 1 BTU per hour square foot °F?
1 BTU per hour square foot °F (BTU/(h·ft²·°F)) equals 5.6783 watts per square metre kelvin (W/(m²·K)); more precisely 5.678263341.
How many BTU per hour square foot °F are in 1 watt per square metre kelvin?
1 watt per square metre kelvin (W/(m²·K)) equals 0.17611 BTU per hour square foot °F (BTU/(h·ft²·°F)); more precisely 0.1761101837.
What is 10 BTU/(h·ft²·°F) in W/(m²·K)?
10 BTU per hour square foot °F = 56.783 watts per square metre kelvin.
What is a BTU per hour square foot °F?
IT BTU basis: ≈ 5.678 263 W/(m²·K). US U-factor unit.
What is a watt per square metre kelvin?
SI unit of heat transfer coefficient and building U-value.
Formula: W/(m²·K) = BTU/(h·ft²·°F) × 5.678263341. Factors last reviewed 2026-10-27.