
structural calculator
Beam Reaction Calculator (Point Load)
Find the two support reactions of a simply-supported beam carrying a single point load.
How it works
R_right = P x a / L. R_left = P - R_right, where a is the distance from the left support.
Worked example
10 ft span, 1,000 lb at 3 ft from left: R_right = 300 lb, R_left = 700 lb.
When to use it
- The two reactions always sum to the applied load.
- A load at midspan splits evenly to both supports.
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All results are an engineering estimate — not for custody transfer. Field measurement and certified tables govern.