Disclaimer
This tool is intended for use by qualified designers. Although every effort has been made to ensure the data and information in this tool are accurate, the Canadian Wood Council does not assume any responsibility for errors or omissions in this tool nor from any engineering designs or plans prepared from it.
To calculate multi-span beams, joists, columns, and wall studs with various load types and load distributions including trapezoidal and point loads, please visit
For comments/suggestions please contact the Canadian Wood Council at info@cwc.ca
This on-line utility provides a convenient reference for spans for common species of Canadian and U.S. dimension lumber, fully in accord with United States building codes and Federal Housing Administration [FHA] requirements. The information provided by this utility applies only in the United States.
Deflection Limits
The following deflection limits are taken into account:
Floor Joists L/360
Ceiling Joists L/240
Rafters [snow/drywall] L/240
Rafters [snow/no drywall] L/180
Rafters [no snow/drywall] L/240
Rafters [no snow/no drywall] L/180
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