Roof snow load calculator

Calculate the mass and pressure of a uniform snow layer from measured depth and bulk density.

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Measured snow depth (metres)

Measured snow bulk density (kg / cubic metre)

More inputs and assumptions

Horizontal roof area covered (square metres)

Answer

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Calculate the mass and pressure of a uniform snow layer from measured depth and bulk density.

More results

Precision and calculation record

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Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Mass per horizontal area equals depth times density; pressure uses standard gravity 9.80665 m/s squared. The example density is an editable scenario, not a snow-type default. This is not a design roof snow load, structural capacity check or snow-removal instruction. Drifts, ice, uneven loading and roof geometry need a qualified assessment; this result cannot establish roof safety.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using Roof snow load calculator

Calculate the mass and pressure of a uniform snow layer from measured depth and bulk density.

Next: Mass calculator

Next: Roof pitch calculator

A worked example

For measured snow depth (metres) = 0.2, measured snow bulk density (kg / cubic metre) = 200, horizontal roof area covered (square metres) = 100, snow mass per area (kg/square metre) = 40.

Before you use the result

Example results for measured snow depth (metres)

These examples use Measured snow bulk density (kg / cubic metre): 200; Horizontal roof area covered (square metres): 100. They are reference calculations, not recommended settings.

Measured snow depth (metres)	Snow mass per area (kg/square metre)
0.1	20
0.2	40
0.4	80

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