Enter any u-value into the calculator to convert it into the equivalent RSI value.
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U Value to RSI Formula
The following equation is used to calculate the RSI from the U-value.
RSI = 1/U
- Where RSI is the thermal resistance per unit area
- U is the u-value
To calculate the RSI, divide 1 by the u-value.
| U-value W/(m²·K) | RSI m²·K/W |
|---|---|
| 0.10 | 10.000 |
| 0.15 | 6.667 |
| 0.20 | 5.000 |
| 0.25 | 4.000 |
| 0.30 | 3.333 |
| 0.35 | 2.857 |
| 0.40 | 2.500 |
| 0.45 | 2.222 |
| 0.50 | 2.000 |
| 0.60 | 1.667 |
| 0.70 | 1.429 |
| 0.80 | 1.250 |
| 0.90 | 1.111 |
| 1.00 | 1.000 |
| 1.20 | 0.833 |
| 1.40 | 0.714 |
| 1.60 | 0.625 |
| 1.80 | 0.556 |
| 2.00 | 0.500 |
| 3.00 | 0.333 |
| * Rounded to 3 decimals. Relationship: RSI = 1 / U (SI units). For imperial conversions: 1 BTU/(hr·ft²·°F) ≈ 5.67826 W/(m²·K), 1 ft²·°F/BTU ≈ 0.176096 m²·K/W. | |
