FITSPEC
Three calculators

Work it out before you spend

The arithmetic every guide tells you to do. Every figure comes off your own compliance plate — nothing here is looked up from a spec database, because a number that's close but wrong is the difference between legal and not.

Live build tracker Select your vehicle, add the parts, and see payload, roof load and GCM together Payload calculator How much can your 4WD actually carry? Roof load calculator What can your roof actually take? Towing calculator Can you legally tow that, loaded?

Enter your GVM and kerb weight once. The calculators remember them, the build tracker ties them all together — and none of it leaves your browser.

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