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Bridge Law Calculator: federal bridge formula and axle weight layout

free weight-layout, axle-load & bridge-law calculator

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Free calculator: straight trucks and 5-axle tractor-trailers, federal rules. The Bridge Law Calculator is a planning tool. Results are estimates based on your inputs, not an engineering review, and are never reviewed or verified. The free calculator does not save your layouts. See the terms and calculator disclaimer.

Company accounts, private design libraries and the shared design library are coming soon: join the early-access list. Designers and dealers: sign up for full access. Need engineering for a specific trailer? Request a quote. About the Bridge Law Calculator · Quick check · Privacy