R-value (US) to Square meter kelvin per watt (RSI) Converter
1 R-value (US) is about 0.1761101837 square meter kelvins per watt. Convert R-value units (US) (ft²·°F·h/BTU) to square meter kelvins per watt (m²·K/W) below: type a value and the result updates as you type.
ft²·°F·h/BTU to m²·K/W calculator
Result
R-value (US) to Square meter kelvin per watt (RSI) conversion
1 ft²·°F·h/BTU ≈ 0.1761101837 m²·K/Wone R-value (US) in square meter kelvins per watt
1 m²·K/W ≈ 5.678263341 ft²·°F·h/BTUone square meter kelvin per watt in R-value units (US)
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.
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).
Source:R-value (US): NIST Special Publication 811 (2008), Appendix B.8; Square meter kelvin per watt (RSI): SI Brochure, 9th edition (BIPM, 2019)
How to 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.
Formula
m²·K/W = ft²·°F·h/BTU × 0.1761101837
The factor is rounded here. The calculator uses the exact value.
Examples
- 5 ft²·°F·h/BTU = 5 × 0.1761101837 ≈ 0.8805509184 m²·K/W
- 25 ft²·°F·h/BTU = 25 × 0.1761101837 ≈ 4.402754592 m²·K/W
- 100 ft²·°F·h/BTU = 100 × 0.1761101837 ≈ 17.61101837 m²·K/W
R-value (US) to Square meter kelvin per watt (RSI) conversion table
| R-value (US) (ft²·°F·h/BTU) | Square meter kelvin per watt (RSI) (m²·K/W) |
|---|---|
| 0.1 ft²·°F·h/BTU | 0.01761101837 m²·K/W |
| 0.5 ft²·°F·h/BTU | 0.08805509184 m²·K/W |
| 1 ft²·°F·h/BTU | 0.1761101837 m²·K/W |
| 2 ft²·°F·h/BTU | 0.3522203674 m²·K/W |
| 3 ft²·°F·h/BTU | 0.528330551 m²·K/W |
| 5 ft²·°F·h/BTU | 0.8805509184 m²·K/W |
| 10 ft²·°F·h/BTU | 1.761101837 m²·K/W |
| 20 ft²·°F·h/BTU | 3.522203674 m²·K/W |
| 25 ft²·°F·h/BTU | 4.402754592 m²·K/W |
| 50 ft²·°F·h/BTU | 8.805509184 m²·K/W |
| 100 ft²·°F·h/BTU | 17.61101837 m²·K/W |
| 250 ft²·°F·h/BTU | 44.02754592 m²·K/W |
| 500 ft²·°F·h/BTU | 88.05509184 m²·K/W |
| 1000 ft²·°F·h/BTU | 176.1101837 m²·K/W |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many square meter kelvins per watt are in one R-value (US)?
- One R-value (US) is about 0.1761101837 square meter kelvins per watt.
- How do I 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. The formula is ft²·°F·h/BTU = m²·K/W × 5.678263341.
- 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 R-value (US) or a square meter kelvin per watt?
- 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.