Span Options Calculator for Wood Joists and Rafters
Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement. Joists and rafter spans for common loading conditions can be determined. A “span options” calculator allows selection of multiple species and grades for comparison purposes.
Read the Tutorial for Understanding Loads and Using Span Tables.
The Span Calculator is supported by the Softwood Lumber Board.