Insulation Calculators

Calculate insulation package quantities, added R-value, material thickness and attic ventilation opening area.

Available insulation calculators

3 calculators for this project type.

Insulation & VentilationAttic Insulation Cost CalculatorDetermine additional nominal R-value, batt or roll layers, package quantities and costs for a measured attic floor.

Insulation & VentilationAttic Ventilation Area CalculatorCalculate net free ventilation area and count vents from their labeled airflow openings, with code-dependent assumptions identified.

Insulation & VentilationInsulation R-Value CalculatorCalculate the added insulation thickness needed for a selected nominal R-value and count packages using coverage at that thickness.

Planning insulation projects

Insulation R-Value estimates added thermal resistance from chosen material properties. Attic Insulation Cost turns the required area and layer allowance into complete packages. Attic Ventilation Area calculates nominal net free area, which must be checked against vent manufacturer ratings and local requirements.