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Watts per square metre kelvin to BTU per hour square foot °F

1 watt per square metre kelvin = 0.17611 BTU per hour square foot °F · 1 BTU/(h·ft²·°F) = 5.6783 W/(m²·K)

1 watt per square metre kelvin = 0.17611 BTU per hour square foot °F

How it’s calculated

BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101837

  • Multiply the value in watts per square metre kelvin by 0.1761101837.
  • To go back, divide by 0.1761101837 (or multiply by 5.678263341).
  • 1 W/(m²·K) = 0.1761101837 BTU/(h·ft²·°F) · 1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K)
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 BTU/(h·ft²·°F) = 5.67826334111349 W/(m²·K). Source: BIPM SI Brochure (9th ed.); NIST SP 811 / Handbook 44.

  2. Multiply by the factor written as a fraction

    Put W/(m²·K) in the denominator so it cancels, leaving BTU/(h·ft²·°F).

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 0.17611 BTU/(h·ft²·°F)

1 W/(m²·K) in other units

Batch convert W/(m²·K) → BTU/(h·ft²·°F)
Results
  1. 1 W/(m²·K) = 0.17611 BTU/(h·ft²·°F)
  2. 5 W/(m²·K) = 0.88055 BTU/(h·ft²·°F)
  3. 10 W/(m²·K) = 1.7611 BTU/(h·ft²·°F)
  4. 25 W/(m²·K) = 4.4028 BTU/(h·ft²·°F)

Permanent link to this conversion

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Quick examples

  • 1 watt per square metre kelvin = 0.17611 BTU per hour square foot °F
  • 5 watts per square metre kelvin = 0.88055 BTU per hour square foot °F
  • 10 watts per square metre kelvin = 1.7611 BTU per hour square foot °F
  • 25 watts per square metre kelvin = 4.4028 BTU per hour square foot °F
  • 100 watts per square metre kelvin = 17.611 BTU per hour square foot °F

About these units

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 (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

Watts per square metre kelvin to BTU per hour square foot °F conversion table

watt per square metre kelvin (W/(m²·K)) to BTU per hour square foot °F (BTU/(h·ft²·°F))
Watts per square metre kelvin (W/(m²·K))BTU per hour square foot °F (BTU/(h·ft²·°F))
0.1 W/(m²·K)0.017611 BTU/(h·ft²·°F)
0.15 W/(m²·K)0.026417 BTU/(h·ft²·°F)
0.2 W/(m²·K)0.035222 BTU/(h·ft²·°F)
0.25 W/(m²·K)0.044028 BTU/(h·ft²·°F)
0.3 W/(m²·K)0.052833 BTU/(h·ft²·°F)
0.5 W/(m²·K)0.088055 BTU/(h·ft²·°F)
1 W/(m²·K)0.17611 BTU/(h·ft²·°F)
1.5 W/(m²·K)0.26417 BTU/(h·ft²·°F)
2 W/(m²·K)0.35222 BTU/(h·ft²·°F)
5 W/(m²·K)0.88055 BTU/(h·ft²·°F)
10 W/(m²·K)1.7611 BTU/(h·ft²·°F)
25 W/(m²·K)4.4028 BTU/(h·ft²·°F)
50 W/(m²·K)8.8055 BTU/(h·ft²·°F)
100 W/(m²·K)17.611 BTU/(h·ft²·°F)
1,000 W/(m²·K)176.11 BTU/(h·ft²·°F)

Related conversions

Frequently asked questions

How do I convert watts per square metre kelvin to BTU per hour square foot °F?

Use BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101837. Multiply the value in watts per square metre kelvin by 0.1761101837.

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.

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.

What is 10 W/(m²·K) in BTU/(h·ft²·°F)?

10 watts per square metre kelvin = 1.7611 BTU per hour square foot °F.

What is a watt per square metre kelvin?

SI unit of heat transfer coefficient and building U-value.

What is a BTU per hour square foot °F?

IT BTU basis: ≈ 5.678 263 W/(m²·K). US U-factor unit.

Formula: BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101837. Factors last reviewed 2026-10-27.