Insulation & Building Science Calculators

Calculate conductive heat loss through a wall, ceiling, attic or floor from area, R-value and temperature difference.

Calculate heat loss through windows or doors from U-factor, area and temperature difference.

Estimate whole-building heat loss from walls, ceiling, floor, windows and air leakage. A quick estimate, not a full load calculation.

Calculate insulation thickness needed to reach a target R-value from the product's R per inch.

Calculate how many bags or bundles of batt insulation you need from area, coverage and waste.

Calculate blown-in insulation volume and bag count from attic area, depth and label coverage.

Calculate polyethylene vapour barrier area with lap allowance and number of rolls.

Calculate dew point temperature from air temperature and relative humidity, in °F and °C.

Calculate relative humidity from air temperature and dew point.

Check if a surface will condense moisture by comparing its temperature with the air's dew point.

Estimate seasonal heating energy from building UA, heating degree-days and system efficiency.