Wood Beam Point Load Planning
A wood beam can look strong, yet one concentrated load may control the design. That load may come from a post, a machine foot, a hoist, a roof support, or a temporary construction brace. This calculator helps you test that case before a member is selected. It focuses on a simply supported beam with one vertical point load. The load may be centered, or it may sit closer to one support.
The tool separates strength and service checks. Strength checks use a load factor. They compare bending stress and shear stress with adjusted allowable values. Service checks use the entered service load. They compare calculated deflection with a span based limit, such as L over 360. This makes the report useful for early sizing, field review, and estimate notes.
Geometry matters. A deeper beam usually gains stiffness faster than strength. That happens because the moment of inertia grows with depth cubed. Width still helps, but depth is often the stronger lever. Load position also matters. A centered load creates the largest bending moment for a given span and load. An off center load increases reaction at the nearer support and changes the deflection shape.
Material inputs should come from trusted tables or project specifications. Use the modulus of elasticity for stiffness. Use allowable bending and shear stresses for strength. Apply any duration factor only when it is allowed by the design method you are using. Do not guess these values for final construction.
The result panel gives reactions, maximum moment, section properties, stresses, deflection, demand ratios, and estimated service load limits. A demand ratio below one means the selected check passes under the entered assumptions. A value above one means the beam needs review. You may reduce the load, shorten the span, move the load, choose a larger section, or select a stronger grade.
This calculator is a planning aid. It does not replace local codes, bearing checks, lateral bracing rules, connection design, moisture adjustments, fire requirements, or professional judgment. Always verify final wood beam selections with a qualified designer when safety or permits are involved. Use conservative inputs when information is uncertain, and keep calculation records with drawings for review on site and approval.