Insulation R-value Converter — 2 Units, Free & Instant
Convert between Insulation R-value units. Choose from 2 different units including R-value (US, ft²·°F·h/BTU), RSI (m²·K/W).
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| From | R-value (US, ft²·°F·h/BTU) (R (US)) |
|---|---|
| R-value (US, ft²·°F·h/BTU) (R (US)) | 1 |
| RSI (m²·K/W) (RSI) | 5.678263 |
R-value vs RSI
Both rate thermal resistance — higher means better insulation. The US R-value (ft²·°F·h/BTU) is what American products display (R-13 walls, R-30–49 attics); Canada, Europe and Australia use the metric RSI (m²·K/W). The bridge: R = RSI × 5.678.