How Much Heat Lost? - Insulated Surface

Watts Loss From Insulated Surface: Calculation Form

To determine Watts required to replace Heat Losses from an Insulated Surface, complete the fields below.
NOTE: The fields in red can be left blank — they're calculated for you.   (Disclaimer)

Volume / Surface Area Calculator

Heat Loss From an Insulated Surface

Mineral Wool and Urethane K-values on this chart are unverified against current manufacturer data — see note below. Consider entering a K Factor above directly for those two.

K-Factor information used to calculate heat losses is drawn from published insulation manufacturer data. Includes a 15% safety factor. Fiberglass, Cellular Glass, and Calcium Silicate values were checked Aug 2026 against current manufacturer data sheets and are a close match; Mineral Wool and Urethane could not be verified and may be out of date — enter a K Factor directly for those if you have current data.

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