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Snow Load Calculator

Calculate snow weight on your roof based on depth and type.

Last updated: June 13, 2026

Calculator

Roof Length

feet

Roof Width

feet

Snow Depth

inches

Snow Type

Results

Snow Load5.0 psf

Pounds per square foot

Total Weight on Roof5,000 lbs

2.5 tons

Roof Area1,000 sq ft

WarningWithin normal range

Typical limit: 20-30 psf for residential

How to Use This Calculator

1Enter your roof area in square feet.
2Enter the snow depth in inches.
3Select snow type (fresh, packed, or ice).
4View total weight in pounds and PSF load.

Formula Explanation

Snow load is calculated from depth and density. Fresh snow weighs about 1.25 lbs/cu ft, packed snow 18.75 lbs/cu ft, and ice 57.2 lbs/cu ft.

Load (PSF) = Depth (in) ÷ 12 × Snow Density Total Weight = Load × Roof Area

Variables:

DepthSnow depth on the roof in inches

DensitySnow weight per cubic foot (varies by type)

Roof AreaTotal roof area in square feet

Worked Examples

2,000 sq ft roof, 18" packed snow

1. Load = (18 ÷ 12) × 18.75 = 28.1 PSF
2. Total = 28.1 × 2,000 = 56,250 lbs

Result: 28.1 PSF / 56,250 lbs — check structural capacity

Why Use This Calculator

Know when snow load exceeds safe limits.
Accounts for different snow densities.
Essential for northern climate homeowners.
Helps decide when to remove roof snow.

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Tips & Best Practices

Most residential roofs support 20-40 PSF snow load. Check your local building code.
Snow gets heavier as it compacts and absorbs water — old snow is much heavier than fresh.
Clear snow when approaching 50-75% of rated capacity.
Watch for ice dams at eaves — they add concentrated load.

Common Mistakes to Avoid

❌ Assuming all snow weighs the same.

✅ Wet packed snow is 15× heavier than fresh powder per inch. Always select the correct snow type.

❌ Ignoring snow drift areas.

✅ Wind creates drifts that can be 2-3× deeper than open areas. Check leeward sides and valleys.

Frequently Asked Questions

How much does snow weigh on a roof?

Fresh snow weighs about 1.25 lbs per cubic foot; packed snow about 18.75 lbs. A foot of packed snow on a 2,000 sq ft roof weighs about 37,500 lbs.

When should I remove snow from my roof?

Remove snow when accumulation approaches 50-75% of your roof's rated load capacity, typically when packed snow exceeds 2-3 feet. If you see sagging, remove immediately.

What is the typical residential roof snow load rating?

Most residential roofs are designed for 20-40 PSF ground snow load. Your local building code specifies the design snow load for your area. Mountain regions may require 60-100+ PSF.

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<iframe src="https://redicalc.com/embed/construction/snow-load-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Snow Load Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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