Enter the thermal resistance into the calculator to determine the U-value. This calculator can also evaluate the thermal resistance given the u-value.
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W/M2K To U Value Formula
The following formula is used to calculate the U-value from W/m2K.
U = 1 / R
Variables:
- U is the U-value (W/m²K)
- R is the thermal resistance (m²K/W)
To calculate the U-value, take the reciprocal of the thermal resistance. This means dividing 1 by the thermal resistance. The result is the U-value, which measures how well a building element (such as a wall or window) conducts heat. A lower U-value indicates better insulation properties.
| Thermal Resistance (m²K/W) | U-Value (W/m²K) |
|---|---|
| 0.10 | 10.000 |
| 0.20 | 5.000 |
| 0.25 | 4.000 |
| 0.30 | 3.333 |
| 0.50 | 2.000 |
| 0.70 | 1.429 |
| 1.00 | 1.000 |
| 1.50 | 0.667 |
| 2.00 | 0.500 |
| 2.50 | 0.400 |
| 3.00 | 0.333 |
| 3.50 | 0.286 |
| 4.00 | 0.250 |
| 5.00 | 0.200 |
| 6.00 | 0.167 |
| 7.00 | 0.143 |
| 8.00 | 0.125 |
| 9.00 | 0.111 |
| 10.00 | 0.100 |
| 12.00 | 0.083 |
| * Rounded to 3 decimals. Relation: U (W/m²K) = 1 ÷ R (m²K/W). | |
What is a W/M2K To U Value?
W/M2K, or watts per square meter per degree Kelvin, is a unit of measurement used in physics to describe the rate of heat flow. The U-value, also known as the overall heat transfer coefficient, is a measure of the rate of heat loss through a structure (such as a wall, floor, or roof). It is expressed in W/M2K and the lower the U-value, the better the material is at insulating. Therefore, converting W/M2K to a U-value essentially involves understanding the insulating properties of a material.
How to Calculate W/M2K To U Value?
The following steps outline how to calculate the U-value (W/m²K) using the formula U = 1 / R.
- First, determine the thermal resistance (R) in m²K/W.
- Next, use the formula U = 1 / R to calculate the U-value in W/m²K.
- Finally, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Thermal resistance (R) = 0.05 m²K/W
