Snow Load Calculator

Estimate the weight of snow on a roof.

How the Math Works

The Snow Load Calculator uses the formula load = area × depth/12 × density to determine the weight of snow on a roof. This equation multiplies the roof's surface area by the snow depth (converted from inches to feet by dividing by 12) and then by the snow's density (weight per cubic foot). The result gives the total load in pounds, helping quantify the structural pressure from accumulated snow.

Practical Applications

To use the calculator, measure your roof's area in square feet, estimate the snow depth in inches, and input a typical snow density value (often 10-20 lbs/ft³ for fresh snow). The calculator multiplies these values to instantly show the total load, allowing you to compare it against your roof's design capacity and decide if immediate action like snow removal is necessary to prevent damage.

Day-to-Day Use

This calculation helps homeowners and contractors make informed safety decisions during winter. By estimating snow load before and after storms, you can prioritize which roofs need attention, schedule timely snow removal, and avoid costly structural repairs from collapsed roofs. It's especially valuable for property managers overseeing multiple buildings and DIY enthusiasts checking their own roofs after heavy snowfall.

Worked example

1,500 ft², 12 in, 15 lb/ft³ → 22,500 lb (15 psf).

FAQ