Snow Load = Snow Density × Depth × Slope Factor. Fresh snow: 5 pcf, packed: 20 pcf, ice: 57 pcf.
Most residential roofs are designed for 20-40 PSF. Remove snow above 25 PSF for safety.
Use this calculator at the planning stage of any construction or renovation project — before purchasing materials. Ordering the right quantity upfront avoids both costly mid-project shortages and unnecessary waste.
A common error is measuring irregular rooms or surfaces as simple rectangles. Recesses, alcoves, and non-right-angle corners require either decomposing the area into simpler shapes or using actual measured dimensions rather than approximations.
A homeowner tiles a 4.2m × 3.8m bathroom floor using 600mm × 600mm tiles. The calculator estimates 47 tiles needed plus a 12% waste allowance — recommending an order of 53 tiles to account for cuts around the perimeter and a spare in case of breakage.
Most roofs handle 20-40 PSF. 12 inches of fresh snow ≈ 5 PSF, but 12 inches of ice ≈ 57 PSF.
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