Layer R-value calculator
Calculate thermal resistance from thickness and conductivity.
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Your measurements
Enter your project values. Your estimate updates as you type.
View your estimateExample values are a starting point. Check product yields and specifications before ordering.
YOUR ESTIMATE
Thermal resistance
2.5m²·K/W
Layer thickness100 mm
Calculated from your measurements.
How it's calculated
R = thickness in metres ÷ thermal conductivity. US R-value = SI R-value ÷ 0.1761101838.
Calculations use consistent units for your selected measurements. Whole purchase quantities are rounded up.
What this estimate includes
For one homogeneous layer only. Excludes framing bridges, surface films, gaps and moisture effects. Conductivity stays in W/(m·K) in both systems.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.
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