US R-value to RSI (metric R)
Type a value in R to get it in RSI instantly.
3.522RSI
That's 1.41× as insulating as an insulated wall, while loft insulation is 1.7× better. That is a U-value of about 0.2839 W/m²·K.
Convert the other way: RSI to R
What it means
How well does it insulate?
R-values here are for the material alone. Real walls lose extra heat through studs, gaps and joints.
The math
How to convert R to RSI
To convert US R-value to RSI (metric R), multiply by 0.17611.
Example: 20 R × 0.17611 = 3.5222 RSI.
In the other direction, 1 RSI = 5.67826 R.
Every unit
Your insulation in every unit
Tables
R to RSI conversion table
| R | RSI |
|---|---|
| 1 R | 0.17611 RSI |
| 2 R | 0.35222 RSI |
| 3 R | 0.528331 RSI |
| 5 R | 0.880551 RSI |
| 8 R | 1.40888 RSI |
| 11 R | 1.93721 RSI |
| 13 R | 2.28943 RSI |
| 15 R | 2.64165 RSI |
| 19 R | 3.34609 RSI |
| 21 R | 3.69831 RSI |
| 30 R | 5.28331 RSI |
| 38 R | 6.69219 RSI |
| 49 R | 8.6294 RSI |
| 60 R | 10.5666 RSI |
RSI to R conversion table
| RSI | R |
|---|---|
| 1 RSI | 5.67826 R |
| 2 RSI | 11.3565 R |
| 3 RSI | 17.0348 R |
| 5 RSI | 28.3913 R |
| 8 RSI | 45.4261 R |
| 11 RSI | 62.4609 R |
| 13 RSI | 73.8174 R |
| 15 RSI | 85.174 R |
| 19 RSI | 107.887 R |
| 21 RSI | 119.244 R |
| 30 RSI | 170.348 R |
| 38 RSI | 215.774 R |
| 49 RSI | 278.235 R |
| 60 RSI | 340.696 R |
Quick answers
Quick answers
- How many RSI is 1 R?
- 1 R is 0.17611 RSI.
- How many RSI is 10 R?
- 10 R is 1.7611 RSI.
- How many RSI is 20 R?
- 20 R is 3.5222 RSI.
The units
About these units
US R-value (R)
The US form, in ft²·h·°F/BTU. Numerically 5.68 times the RSI, which is why US numbers look so large.
RSI (metric R) (RSI)
The metric resistance: square meter-kelvins per watt. Used everywhere except the US.
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