Watt per square meter kelvin (W/(m²·K))
SI unit of heat transfer coefficient (and of U-value): heat flow per area per kelvin of temperature difference.
What is a watt per square meter kelvin?
- Symbol
- W/(m²·K)
- Quantity
- Heat Transfer Coefficient
- Unit system
- SI
- Definition
- SI unit of heat transfer coefficient (and of U-value): heat flow per area per kelvin of temperature difference.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for U-values of walls, windows and roofs in building regulations, and for heat exchanger design.
Watt per square meter kelvin in other heat transfer coefficient units
- 1 W/(m²·K) = 0.001 kW/(m²·K)Kilowatt per square meter kelvin
- 1 W/(m²·K) ≈ 0.1761101837 BTU/(h·ft²·°F)Watt per square meter kelvin to BTU per hour square foot degree Fahrenheit converter
- 1 W/(m²·K) ≈ 0.8598452279 kcal/(h·m²·°C)Kilocalorie (IT) per hour square meter degree Celsius
- 1 W/(m²·K) ≈ 0.00002390057361 cal/(s·cm²·°C)Calorie (thermochemical) per second square centimeter degree Celsius
Watt per square meter kelvin quick reference
| Watt per square meter kelvin | BTU per hour square foot degree Fahrenheit | Kilowatt per square meter kelvin | Kilocalorie (IT) per hour square meter degree Celsius |
|---|---|---|---|
| 1 W/(m²·K) | ≈ 0.1761101837 BTU/(h·ft²·°F) | = 0.001 kW/(m²·K) | ≈ 0.8598452279 kcal/(h·m²·°C) |
| 10 W/(m²·K) | ≈ 1.761101837 BTU/(h·ft²·°F) | = 0.01 kW/(m²·K) | ≈ 8.598452279 kcal/(h·m²·°C) |
| 100 W/(m²·K) | ≈ 17.61101837 BTU/(h·ft²·°F) | = 0.1 kW/(m²·K) | ≈ 85.98452279 kcal/(h·m²·°C) |
| 1000 W/(m²·K) | ≈ 176.1101837 BTU/(h·ft²·°F) | = 1 kW/(m²·K) | ≈ 859.8452279 kcal/(h·m²·°C) |
Where the watt per square meter kelvin fits
The next larger heat transfer coefficient unit is the kilocalorie (IT) per hour square meter degree Celsius (kcal/(h·m²·°C)). 1 W/(m²·K) ≈ 0.8598452279 kcal/(h·m²·°C), and 1 kcal/(h·m²·°C) = 1.163 W/(m²·K).
Frequently asked questions
- How many BTUs per hour square foot degree Fahrenheit are in one watt per square meter kelvin?
- One watt per square meter kelvin ≈ 0.1761101837 BTU/(h·ft²·°F) (BTUs per hour square foot degree Fahrenheit).
- How many kilowatts per square meter kelvin are in one watt per square meter kelvin?
- One watt per square meter kelvin = 0.001 kW/(m²·K) (kilowatts per square meter kelvin).
- How many kilocalories (IT) per hour square meter degree Celsius are in one watt per square meter kelvin?
- One watt per square meter kelvin ≈ 0.8598452279 kcal/(h·m²·°C) (kilocalories (IT) per hour square meter degree Celsius).