Construction

Snow Load Calculator

Estimate roof snow load.

Roof area

Snow depth

Snow density (lb/ft³)

Calculated Output

Total load 1,875

Load per ft² (lb/ft²) 1.25

Formula: load = area × depth/12 × density

Step-by-Step Breakdown

1. Values used:

2. Roof area = 1,500

3. Snow depth = 1

4. Snow density = 15 lb/ft³

6. Total load = 1,875

7. Load per ft² = 1.25lb/ft²

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The math behind it

load per ft² = depth (ft) × snow density; total = × roof area. Fresh snow ≈ 7, packed ≈ 15, wet ≈ 20+ lb/ft³.

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

Danger?

Wet/icy snow is much heavier — clear roofs before loads get high.