// multi-utility computation suite · offline · instant · precise
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build.roof-load Calculator
Calculates total roof load (dead + live + snow) in psf and the total load on a roof beam from tributary width and span. Residential roofs must typically carry 40 psf combined (20 dead + 20 live); snow country codes add 20–100 psf depending on ground snow load.
Inputs
Span
Distance between supports (m). Longer spans experience larger bending moments — structural adequacy must be rechecked.
Pitch
Reference formula or conversion factor shown for context.
Snow
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Dead
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Results
rafter length (m)
The computed linear length.
total UDL on rafter (kPa)
The combined total across all inputs and components.
wall reaction per m (kN/m)
Sample size or count used in the calculation.
snow on slope (kPa)
The gradient -- rise divided by run. In finance, rate of change per unit time.
pitch angle
The computed angle in degrees or radians.
slope factor
A dimensionless multiplier applied in the calculation.