thermostat Insulation Math

Sleeping Pad R-Value & Temperature Rating Calculator

Determine the required ASTM R-Value rating for your sleeping pad based on night temperature, ground conditions, and sleep style.

Trip Environmental Conditions

Lowest Expected Night Temp: 35°F (2°C)

Ground Surface Type

Sleep Preference

Recommended Pad Insulation

Target ASTM R-ValueR-3.23-Season Mild Weather Pad (R 2.0 - 3.4)

Ground Heat Loss RiskModerate Risk

ASTM Standard BenchmarkF3340-18 Tested

Insulation Stacking Tip

You can stack a closed-cell foam pad (R-2.0) under an inflatable air pad (R-3.5) to achieve a combined insulation of R-5.5 for winter camping without buying a expensive dedicated winter pad.