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Heat Transfer

W/(m²·K)toBTU/(hr·ft²·°F)

Convert watts per square metre-kelvin (W/(m²·K)) to British thermal units per hour-square foot-Fahrenheit (BTU/(hr·ft²·°F)).

Factor1 W/(m²·K) = 0.1761102 BTU/(hr·ft²·°F)

Converter

W/(m²·K)

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

Result
17.611BTU/(hr·ft²·°F)

Rendered to 6 significant figures.

Formula

Formula
BTU/(hr·ft²·°F) = W/(m²·K) × 0.1761102

Multiply any value in watts per square metre-kelvin by 0.1761102 to obtain the value in British thermal units per hour-square foot-Fahrenheit.

Worked example

Convert 100 W/(m²·K) to BTU/(hr·ft²·°F).

  1. 01Start with 100 W/(m²·K).
  2. 02Multiply by the conversion factor: 100 × 0.1761102 = 17.611 BTU/(hr·ft²·°F).
Result100 W/(m²·K) = 17.611 BTU/(hr·ft²·°F)

Conversion table

W/(m²·K)BTU/(hr·ft²·°F)
10.17611
20.35222
50.88055
101.7611
203.5222
508.8055
10017.611
20035.222
50088.055
1000176.11

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from W/(m²·K) to BTU/(hr·ft²·°F)?
1 W/(m²·K) equals 0.1761102 BTU/(hr·ft²·°F). To convert, multiply the value in watts per square metre-kelvin by 0.1761102.
How do I convert 1 W/(m²·K) to BTU/(hr·ft²·°F)?
1 W/(m²·K) = 0.17611 BTU/(hr·ft²·°F). For any value, multiply by 0.1761102.
How do I convert BTU/(hr·ft²·°F) back to W/(m²·K)?
Divide by the same factor — or equivalently, multiply by 5.678263. So 1 BTU/(hr·ft²·°F) = 5.67826 W/(m²·K).
When would I need to convert watt per square metre-kelvin to British thermal unit per hour-square foot-Fahrenheit?
Heat-transfer coefficient conversions between W/(m²·K) and BTU/(hr·ft²·°F) are needed in heat-exchanger sizing, boiler and condenser design, and HVAC calculations. W/(m²·K) is standard in SI engineering, and BTU/(hr·ft²·°F) is common in US heat-exchanger correlations and vendor literature.
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).

Heat exchanger U-value context

The overall heat transfer coefficient (U-value) is expressed in W/(m²·K) or BTU/(h·ft²·°F). It describes how effectively a heat exchanger transfers heat between two fluids and is central to the sizing equation A = Q / (U × LMTD).

Typical U-values vary widely by exchanger type and fluid pair — from 10 W/(m²·K) for gas–gas shell-and-tube exchangers to over 5000 W/(m²·K) for water–water plate exchangers.

Typical U-Values Reference →LMTD Calculator →

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