Free trucking compliance tools

Free calculators for truckers and dispatchers: the Federal Bridge Formula, axle weight limits, and weight/length unit conversion. No login, no signup.

Quick, free calculators for axle weights and load compliance — no login, no credits. For a full pass/fail verdict across federal, state, and Canadian rules with a shareable certificate, use the LoadLegit app.

Federal Bridge Formula calculatorMaximum legal weight for any set of axles by their spacing. Axle weight limit checkerSteer, drive, trailer & gross vs the federal limits. Weight & length converterlb ↔ kg, ton ↔ tonne, ft ↔ m, in ↔ cm. Compliance glossaryGVW, GVWR, KPRA, tandem, tridem — plain-English definitions.

Check a real load in secondsLoadLegit turns axle weights into a pass/fail compliance verdict — federal Bridge Formula plus verified state and Canadian rules — and issues a shareable certificate. Try it free →

Federal Bridge Formula calculatorFree Federal Bridge Formula calculator. Enter axle count and the spacing between the extreme axles to get the maximum legal weight (W = 500(LN/(N-1)+12N+36)).Axle weight limit checker (federal)Check steer, drive, and trailer axle weights plus gross weight against the US federal limits: 20,000 lb single, 34,000 lb tandem, 80,000 lb gross.