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Axle weight checker

The federal bridge formula on every axle group, plus a state's own axle and gross limits — each verdict line carrying the statute behind it and the date that document was revised.

Start from a common rig

Four real configurations, not demonstrations. Pick the closest and then edit the positions and weights — a preset only fills the form.

Axles, front to rear

Position is the distance in feet from the steer axle, so the first axle is always 0. Measure centre to centre, and for a wheel cluster use the centre of the cluster. Weight is what that axle actually carries, not its rating.

Up to 13 axles. Positions must increase front to rear; the calculator refuses to compute on impossible geometry rather than returning a number.

State limits

Only the 31 states with a jurisdiction file are offered. Each verdict line carries the statute or rule it came from, that document's own revision date, and the date we read it. Where two of a state's own documents disagree, the line says so and refuses to pick a side.

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What the verdict lines mean

Each state line compares one measurement from your rig against that state's published limit. The measurement is derived, not typed: the heaviest single axle is the heaviest one you entered, and the heaviest tandem group is the heaviest group spanning 8 ft or less — the span that makes a group a tandem under federal law.

Every limit links to the document it came from and carries two dates: the revision date the document itself states, and the date we retrieved it. They are different facts and a single "last updated" stamp would hide the difference — a schedule downloaded this morning can still be five years old.

Compare legal limits across all states →

What comes next

Questions

What is different from the bridge formula calculator?

This one brings a state's own limits into the answer. Pick one of the 31 covered states and the heaviest single axle, the heaviest tandem group and the gross are checked against that state's published figures, each verdict line carrying the rule and its revision date.

Why does a state limit sometimes say "sources disagree"?

Because two of that state's own official documents give different figures and both are in effect. Neither has been adopted here — the line shows both with their citations and the verdict reads "cannot tell", which is the honest answer and the one that sends the question to the permit office rather than to a coin toss.

What does the headroom column tell me?

How much more that group could carry before it is over. A pass/fail says nothing about whether shifting a thousand pounds of freight breaks the rig, and the group with the least headroom is the one that decides how the load can be re-secured.

Does a state pass mean the whole route is legal?

No. Seasonal weight restrictions are posted road by road and can make a legal axle group illegal on a specific route in March, and local bridge postings are not in any statewide figure. Both are named in the "what this does not answer" list on the result.