Utilizing span tables in Smartbuild can be a huge timesaver. Once they are setup, you can put your old charts away and have Smartbuild look up the data for you.
Watch this video to learn how: https://www.youtube.com/watch?v=fzquHCVNmbo&t=7s
You can find free calculations online. One example would be :https://awc.org/calculators/span-options-calculator-for-wood-joists-and-rafters/ NOTE: We are not affiliated with AWC in any way nor has this data been verified.