Roof Snow Load Calculator
Estimate the weight of snow on a roof from depth and snow type — pounds per square foot and total load — and compare it with the roof's design load.
How to use
- 1Enter the snow depth and choose the snow type.
- 2Enter the roof area and design snow load (from local building code) to compare.
How it's calculated
Load (psf) = depth (ft) × density: fresh snow ≈ 7 lb/ft³, settled ≈ 15, packed/wet ≈ 20, ice ≈ 57.
Frequently asked questions
How much snow can a roof hold?
Depends on design: many US homes are designed for 20–30 psf, more in snowy regions. Check local code or your plans.
Why does snow type matter so much?
A foot of wet, packed snow can weigh three times as much as a foot of fresh powder.
When should I remove snow?
If loads approach the design value or you see sagging, cracking or doors that stick. Use a roof rake from the ground — don't climb on a snowy roof.