Why this exists
Most freight calculators online are lead capture forms with arithmetic attached. They ask for your email, they do not tell you which rules they are using, and a surprising number are still applying density scales that were retired in 2025.
FreightFigure is the opposite arrangement. Every tool shows the steps it took, every rule number carries the date it was last verified, and there is no signup because there is nothing to sign up to.
How the calculations work
Everything runs in your browser. There is no backend, no database and no account system. When you type a dimension, nothing leaves your device — the arithmetic happens locally and the result appears as you type.
That is also why results are shareable: the calculator state lives in the URL query string, so sending someone the link sends them the numbers.
Where the rule numbers come from
The NMFC density scale, the carrier dimensional weight divisors, the container interior dimensions and the rental truck capacities all live in a single file, each with the date it was last checked against its source. They were last verified on Sep 24, 2026.
Keeping them in one place means an update happens once rather than in thirteen calculators, and it means the date you see on the page is the real one rather than a number someone typed into a footer.
The 5 guides explain what those rules say and where they came from.
What these tools are not
They are estimates. A carrier’s tariff, your contract, accessorial charges and the condition of your freight on the day will all move the final number. Nothing here is a quote, and nothing here is tax, legal or financial advice.
The IFTA calculator in particular is a checking tool for your own records, not a substitute for the return you file with your base jurisdiction.
Corrections
If a number here is wrong, that is worth knowing about and worth fixing quickly. Write to hello@freightfigure.com with what you found and, where you can, a link to the source.