Sleeping Pad R-Value Calculator

Calculate combined R-value when stacking sleeping pads. Determine if your insulation is adequate for expected ground temperatures.

Results

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How It Works

R-value measures resistance to heat flow — higher is warmer. R-values are additive when stacking pads. Guidelines: summer camping R-value 1.5+, 3-season R-value 3+, winter R-value 5+. A closed-cell foam pad (R-value 1.5-2.5) under an inflatable (R-value 3-4) is a popular winter combo. The ASTM R-value standard (2020) made ratings consistent across brands.