Square meter kelvin per watt (RSI) to R-value (US) Converter
1 square meter kelvin per watt is about 5.678263341 R-value units (US). Convert square meter kelvins per watt (m²·K/W) to R-value units (US) (ft²·°F·h/BTU) below: type a value and the result updates as you type.
m²·K/W to ft²·°F·h/BTU calculator
Result
Square meter kelvin per watt (RSI) to R-value (US) conversion
1 m²·K/W ≈ 5.678263341 ft²·°F·h/BTUone square meter kelvin per watt in R-value units (US)
1 ft²·°F·h/BTU ≈ 0.1761101837 m²·K/Wone R-value (US) in square meter kelvins per watt
Square meter kelvin per watt (RSI) (m²·K/W): SI unit of thermal insulance, the "R-value" of insulation outside the United States (often called RSI).
R-value (US) (ft²·°F·h/BTU): US unit of thermal insulance: square foot degree Fahrenheit hour per BTU (IT). An "R-13" wall has 13 of these.
Source:Square meter kelvin per watt (RSI): SI Brochure, 9th edition (BIPM, 2019); R-value (US): NIST Special Publication 811 (2008), Appendix B.8
How to convert square meter kelvins per watt to R-value units (US)
To convert square meter kelvins per watt to R-value units (US), multiply the number of square meter kelvins per watt by about 5.678263341.
Formula
ft²·°F·h/BTU = m²·K/W × 5.678263341
The factor is rounded here. The calculator uses the exact value.
Examples
- 5 m²·K/W = 5 × 5.678263341 ≈ 28.39131671 ft²·°F·h/BTU
- 25 m²·K/W = 25 × 5.678263341 ≈ 141.9565835 ft²·°F·h/BTU
- 100 m²·K/W = 100 × 5.678263341 ≈ 567.8263341 ft²·°F·h/BTU
Square meter kelvin per watt (RSI) to R-value (US) conversion table
| Square meter kelvin per watt (RSI) (m²·K/W) | R-value (US) (ft²·°F·h/BTU) |
|---|---|
| 0.1 m²·K/W | 0.5678263341 ft²·°F·h/BTU |
| 0.5 m²·K/W | 2.839131671 ft²·°F·h/BTU |
| 1 m²·K/W | 5.678263341 ft²·°F·h/BTU |
| 2 m²·K/W | 11.35652668 ft²·°F·h/BTU |
| 3 m²·K/W | 17.03479002 ft²·°F·h/BTU |
| 5 m²·K/W | 28.39131671 ft²·°F·h/BTU |
| 10 m²·K/W | 56.78263341 ft²·°F·h/BTU |
| 20 m²·K/W | 113.5652668 ft²·°F·h/BTU |
| 25 m²·K/W | 141.9565835 ft²·°F·h/BTU |
| 50 m²·K/W | 283.9131671 ft²·°F·h/BTU |
| 100 m²·K/W | 567.8263341 ft²·°F·h/BTU |
| 250 m²·K/W | 1419.565835 ft²·°F·h/BTU |
| 500 m²·K/W | 2839.131671 ft²·°F·h/BTU |
| 1000 m²·K/W | 5678.263341 ft²·°F·h/BTU |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many R-value units (US) are in one square meter kelvin per watt?
- One square meter kelvin per watt is about 5.678263341 R-value units (US).
- How do I convert R-value units (US) to square meter kelvins per watt?
- To convert R-value units (US) to square meter kelvins per watt, multiply the number of R-value units (US) by about 0.1761101837. The formula is m²·K/W = ft²·°F·h/BTU × 0.1761101837.
- Is this conversion exact?
- Yes. Both units have exact definitions, but the factor has more decimal places than can be shown, so displayed results are rounded. The calculator works with 50 significant digits before rounding.
- Which is larger, a square meter kelvin per watt or a R-value (US)?
- A square meter kelvin per watt is about 5.678263341 times larger than a R-value (US). In other words, a R-value (US) is about 0.1761101837 of a square meter kelvin per watt.