Thermal Conductivity Converter
Convert thermal conductivity values between W/m·K, BTU/(h·ft·°F) and calorie-based units — for insulation specs, engineering homework and building materials. Type a value in any box; all units update live.
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How to use
- Type the conductivity value in any unit box, for example W/m·K.
- The same value appears in every other unit at once.
- Change the number or the unit and all results recalculate by themselves.
- Compare materials using the same unit — a lower number means better insulation.
Good to know
- Lower conductivity means better insulation; compare materials using the same unit.
- Foam (~0.03 W/m·K) insulates far better than concrete (~1 W/m·K) — that gap is why insulation layers matter.
- Always check which unit a data sheet uses before comparing two products.
Note
Lower value means better insulation. For example, foam has conductivity of about 0.03 W/m·K and concrete about 1 W/m·K.