Convert r-value (us)s to rsi (m²·k/w)s
1 ft²·°F·h/BTU = 0.176110183682 m²·K/W — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.176 110 183 682m²·K/W
As a fraction: 9290304000/52752792631
1 ft²·°F·h/BTU = 0.176110183682 m²·K/W
How to convert r-value (us)s to rsi (m²·k/w)s
Multiply the number of r-value (us)s by 0.176110183682 to get rsi (m²·k/w)s.
R-value (US): The number on US insulation batts. R-13 is RSI 2.29 — divide by 5.678 to go metric.
R-value (US) to RSI (m²·K/W) conversion table
| R-value (US)s (ft²·°F·h/BTU) | RSI (m²·K/W)s (m²·K/W) |
|---|---|
| 1 ft²·°F·h/BTU | 0.176 110 18 |
| 2 ft²·°F·h/BTU | 0.352 220 37 |
| 3 ft²·°F·h/BTU | 0.528 330 55 |
| 5 ft²·°F·h/BTU | 0.880 550 92 |
| 10 ft²·°F·h/BTU | 1.761 101 8 |
| 20 ft²·°F·h/BTU | 3.522 203 7 |
| 25 ft²·°F·h/BTU | 4.402 754 6 |
| 50 ft²·°F·h/BTU | 8.805 509 2 |
| 100 ft²·°F·h/BTU | 17.611 018 |
| 250 ft²·°F·h/BTU | 44.027 546 |
| 500 ft²·°F·h/BTU | 88.055 092 |
| 1000 ft²·°F·h/BTU | 176.110 18 |
RSI (m²·K/W) to R-value (US) conversion table
| RSI (m²·K/W)s (m²·K/W) | R-value (US)s (ft²·°F·h/BTU) |
|---|---|
| 1 m²·K/W | 5.678 263 3 |
| 2 m²·K/W | 11.356 527 |
| 3 m²·K/W | 17.034 79 |
| 5 m²·K/W | 28.391 317 |
| 10 m²·K/W | 56.782 633 |
| 20 m²·K/W | 113.565 27 |
| 25 m²·K/W | 141.956 58 |
| 50 m²·K/W | 283.913 17 |
| 100 m²·K/W | 567.826 33 |
| 250 m²·K/W | 1419.5658 |
| 500 m²·K/W | 2839.1317 |
| 1000 m²·K/W | 5678.2633 |
Frequently asked
How many rsi (m²·k/w)s are in a r-value (us)?
One r-value (us) equals 0.1761101837 rsi (m²·k/w)s (ft²·°F·h/BTU → m²·K/W). That figure is exact, not rounded.
How do you convert r-value (us)s to rsi (m²·k/w)s?
Multiply the number of r-value (us)s by 0.176110183682 to get rsi (m²·k/w)s.
What is 1 m²·K/W in r-value (us)s?
One rsi (m²·k/w) is 5.678263341 r-value (us)s.
What is 10 ft²·°F·h/BTU in m²·K/W?
10 ft²·°F·h/BTU = 1.761 101 8 m²·K/W.
What exactly is a r-value (us)?
The number on US insulation batts. R-13 is RSI 2.29 — divide by 5.678 to go metric.