Beam Span Calculator | Free Construction Calculators

Calculate maximum allowable span for beams supporting joists or other structural loads.

About Beam Spans

Beams are horizontal structural members that support loads from joists, rafters, or walls. This calculator determines maximum safe spans based on lumber properties and applied loads.

Critical Warning

Improper beam sizing can lead to structural failure. This calculator provides preliminary estimates only. Always have beam sizes verified by a licensed professional engineer for load-bearing applications.