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Joist deflection calculator

Enter your floor joist information and then hit 'Calculate deflection' to find out your floor rating. Good Luck!

NOTE! This calculator is designed to work with dimensional lumber only! If you have engineered truss or I-beam type joists please do not use this calculator.

Joist Material
Joist Height
Joist Width
Joist Spacing on center
Joist Length feet

Software error:

Can't locate object method "endform" via package "CGI" at line 632.

For help, please send mail to the webmaster (, giving this error message and the time and date of the error.