Convert RSI (m²·K/W) (RSI) to R-value (US, ft²·°F·h/BTU) (R (US))
Everything needed to convert RSI (m²·K/W) (RSI) to R-value (US, ft²·°F·h/BTU) (R (US)): the live calculator, the exact formula, and worked examples for common values.
Formula
1 RSI = 5.678263 R (US)
To convert RSI to R (US), multiply the value by 5.678263.
Conversion Table
| RSI (m²·K/W) (RSI) | R-value (US, ft²·°F·h/BTU) (R (US)) |
|---|---|
| 0.5 RSI | 2.8391 R (US) |
| 1 RSI | 5.6783 R (US) |
| 1.5 RSI | 8.5174 R (US) |
| 2 RSI | 11.3565 R (US) |
| 2.5 RSI | 14.1957 R (US) |
| 3 RSI | 17.0348 R (US) |
| 3.5 RSI | 19.8739 R (US) |
| 4 RSI | 22.7131 R (US) |
| 4.5 RSI | 25.5522 R (US) |
| 5 RSI | 28.3913 R (US) |
| 5.5 RSI | 31.2304 R (US) |
| 6 RSI | 34.0696 R (US) |
| 6.5 RSI | 36.9087 R (US) |
| 7 RSI | 39.7478 R (US) |
| 7.5 RSI | 42.587 R (US) |
| 8 RSI | 45.4261 R (US) |
| 8.8 RSI | 49.9687 R (US) |
| 10 RSI | 56.7826 R (US) |
Common RSI to R (US) Examples
- 1 RSI = 5.6783 R (US)
- 2 RSI = 11.3565 R (US)
- 3 RSI = 17.0348 R (US)
- 4 RSI = 22.7131 R (US)
- 5 RSI = 28.3913 R (US)
- 6 RSI = 34.0696 R (US)
- 7 RSI = 39.7478 R (US)
- 8.8 RSI = 49.9687 R (US)
About the units
RSI (m²·K/W) (RSI) — RSI is the metric insulation rating in m²·K/W used in Canada, Europe and Australia. One RSI equals about R-5.68 in US terms, so metric and US product labels differ by that factor.
R-value (US, ft²·°F·h/BTU) (R (US)) — The US R-value rates insulation in ft²·°F·h/BTU — the number on every American insulation batt (R-13 walls, R-30 to R-49 attics). Higher is better.
Frequently Asked Questions
How many decimal places should I keep when converting RSI to R (US)?
For everyday use, 2 to 4 decimal places are enough. Scientific or engineering work may require 6 or more.
Can I convert R (US) back to RSI?
Yes. Simply invert the ratio: divide the R (US) value by 5.678263 to get the equivalent in RSI.
What is the difference between RSI and R (US)?
Both measure Insulation R-value, but they belong to different unit systems or scales, which is why a conversion factor is needed between them.
Why are there different units for Insulation R-value?
Different regions and industries developed their own Insulation R-value standards over time. International trade and science later required conversion tools to bridge them.
How much is 1 RSI in R (US)?
1 RSI equals 5.678263 R (US). This ratio applies to every conversion between the two units.
What is the formula to convert RSI to R (US)?
The formula is 1 RSI = 5.678263 R (US). To convert any value, multiply the value by 5.678263.