Snow Load Calculator
Estimate roof snow load in psf and total pounds.
This snow load calculator estimates roof snow load in pounds per square foot (psf) and total pounds. It uses snow depth, snow density, and roof area. Divide the depth in inches by 12, multiply it by density in pounds per cubic foot, then multiply the result by the roof area.
Snow load
15
psf
Total load
18,000
pounds
Depth
12
in at 15 lb/ft³
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How does the snow load calculator work?
Snow load in psf = (depth in inches ÷ 12) × density (lb/ft³). Multiply by roof area to get total load in pounds. Fresh snow ≈ 7 lb/ft³, settled ≈ 15, packed/wet ≈ 20+.
Which guide explains this in more depth?
- Panel roofs waste differently from shingles: ribs, hips and valleys all change the number you order. Read the metal roofing calculator waste factor guide for the full worked example.
What else do people ask about this calculator?
How much does 1 foot of snow weigh?
Fresh dry snow ~7 psf, settled snow ~15 psf, wet or packed snow can exceed 20 psf per foot of depth.
When should I remove snow from my roof?
If snow depth × density approaches the roof's design snow load (often 20–40 psf depending on region), rake or shovel.
Which related calculators should I use next?
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