SNOW LOAD
ROOF SNOW LOAD
pf = 0.7 × Ce × Ct × I × pg
psf
/12
RESULT
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FILL IN ABOVE
Per ASCE 7-22 simplified method. Estimate only — local jurisdictions may require site-specific snow analysis. Always verify pg with your building department.
About this calculator
This snow load calculator returns the design snow load for a residential pitched roof using the ASCE 7 simplified formula: pf = 0.7 × Ce × Ct × I × pg. The four multipliers account for exposure (Ce), thermal effect (Ct, heated vs unheated structures), importance (I, set to 1.0 for residential Risk Category II), and ground snow load (pg, the regional value from your local building department or snowloadinfo.com). For sloped roofs above 30 degrees on warm slippery surfaces, the slope factor Cs reduces the load further. The result is the design load (psf) that rafters, trusses, and sheathing must support — used by structural engineers and code officials to verify framing.