How to Calculate Insulation for a Attic
Follow these steps to get the right amount of insulation for any attic project, then use the calculator below to skip the math.
- Measure the area. Multiply length × width in feet to get square footage.
- Convert to square foot. Apply the standard insulation coverage factor.
- Add overage. Multiply by 1.10 to cover 10% waste.
- Round up. Always round up to the next whole square foot or bag.
Calculate Insulation
You need
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square foot
- Area
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- With 10% overage
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- Estimated cost (US avg)
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