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Privacy PolicyEstimate vehicle payload, GVM and GCM before buying accessories or modifications. An indicative Australian towing weight calculator — not an engineering assessment. Always verify against your compliance plate and a weighbridge. New to towing weights? See 7 numbers to check before you buy.
GVM is a vehicle's maximum loaded mass rating. A GVM calculator estimates the margin to that rating; it does not set a new rating.
GVM margin = applicable GVM rating − actual loaded vehicle mass.
Fictional example: a 3,200 kg GVM rating and 3,080 kg loaded vehicle mass leave a 120 kg arithmetic margin. This does not confirm axle, trailer, towing or combination limits.
If weighing while coupled, the vehicle axle readings already include the coupling load. Do not add that load again. When building an estimate from an unhitched starting mass, include each passenger, accessory, cargo and coupling load only once.
Record what your starting weight includes. A missing measurement remains unknown. Use the free measurement worksheet to gather ratings and loaded weights before using the tools.
Definition reference: Transport WA GVM and GCM FAQs. Any modified rating must be supported by the applicable approval documents.
Enter your vehicle to auto-fill specs. Searches the verified ClearPath database first. Unmatched, older or unusual vehicles are clearly identified for manual specification verification.
A model suggestion or published reference is not a complete calculation record. Automatic calculations need applicable figures for your exact variant and a usable vehicle mass. If figures are missing, use your own measured or documented values through manual entry; leave unknown values unknown.
Select from common mods below, or add accessories directly from the ClearPath database with verified weights.
Please enter a calculation-safe vehicle mass and GVM to calculate results
Get immediate insights into your vehicle's weight status, payload capacity, and towing compliance.
Identify potential compliance issues before they become expensive problems or safety risks.
Download PDF summaries or compare multiple setups side by side to see how changes affect your payload.
If you have a vehicle and caravan in mind, our detailed Vehicle + Caravan Assessment identifies the key payload, GCM, towball and axle-load questions to verify before you commit.
Not sure which review? Choose the right review