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Envelope

Building Heat Loss & Insulation Calculator

Estimate heat loss watts from envelope area, ΔT, and R-value.

Envelope areasq ft

Indoor−outdoor ΔT°F

Wall R-valueR

Heat loss

Enter area, ΔT & R-value

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About Building Heat Loss & Insulation Calculator

Heat loss formula

BTU/hr ≈ (area × ΔT) ÷ R. Convert to watts for electric heat sizing. Add roof, windows, and infiltration separately for full models.

Frequently asked questions

Q: Whole house? A: Sum each surface—this is one envelope segment.

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