4WD GVM Calculator

Estimate your vehicle’s GVM and axle loads.

About the Calculator

This free 4WD GVM calculator helps Australian drivers accurately estimate remaining payload, axle loads, and vehicle weight using real-world vehicle geometry and brand-specific accessories.

Unlike generic calculators, this tool accounts for vehicle-specific mounting positions and real accessory weights, so you’re not guessing or relying on rough averages.

It’s ideal for popular platforms such as the Toyota LandCruiser 200 Series, 79 Series, Y62 Patrol, Prado, and other touring 4WDs.

Why staying under GVM matters

Exceeding your GVM doesn’t just affect legality - it directly impacts safety, handling, and long-term reliability.

How this calculator is different

Most online GVM calculators use generic weight assumptions. This calculator goes further by modelling real-world vehicle geometry and brand-specific accessories.

Quick Note Before You Start

This calculator provides realistic estimates based on real-world data. For legal compliance or certification, always confirm results using a certified weighbridge or engineer.

Step 1 of 3: Getting Started


No signup • No personal data stored • Quick • Simple

Loading capable 4WDs and fun modifications...

Built Using Real Vehicle Geometry

Unlike basic calculators, this tool uses vehicle-specific axle positions and mounting locations to accurately model how weight is distributed across your 4WD.

Accessory weights are based on real brand and model data - helping you plan your setup without relying on guesswork or rough estimates.

Who Should Use a 4WD GVM Calculator?

This tool is ideal for touring setups, tradespeople, off-road builds, and anyone fitting accessories such as bull bars, canopies, drawers, roof racks, or towing caravans and trailers.

What makes this GVM calculator different?

This calculator uses vehicle-specific geometry and real brand-based accessory weights. This allows far more accurate axle load and GVM estimates compared to generic calculators. Need more details? Visit our “How the Calculator Works” page.

Do I need to estimate accessory weights?

No. Accessories are selected by brand and model so users don’t need to guess weights or research specifications separately. It is recommended to verify weights with manufacturers specifications before committing to a purchase. See our ”Top Accessories” for accessory selection tips.

Vehicle Weight Glossary

Tare Mass

The weight of the vehicle with 10L of fuel and all fluids, but zero passengers or cargo. This is often the "showroom" weight.

Kerb Weight

The vehicle ready to drive with a full tank of fuel, but no passengers or payload. (Check your manual, definitions vary by manufacturer).

Axle Capacity

The maximum weight a single axle (front or rear) can carry. The sum of Front + Rear Axle limits is usually higher than the total GVM.

Need more details? See our article “Ultimate Guide for 4WD Owners”

Common GVM Questions

What is the difference between GVM and Payload?

GVM (Gross Vehicle Mass) is the maximum legal weight of your vehicle when fully loaded. Payload is the weight you can add to the vehicle (passengers, accessories, fuel, and cargo). Put simply: Curb Weight + Payload = GVM. This calculator helps you see if your payload exceeds the GVM limit.

Does tow ball weight count towards my GVM?

Yes, absolutely. The downward weight of your caravan or trailer on the tow ball (Tow Ball Mass) is considered as vehicle "payload" and acts as a heavy weight on your rear axle. While this tool does not calculate GCM (total combination weight), you can add your tow ball weight as an accessory to see how it affects your GVM and rear axle load.

Does a suspension upgrade automatically increase my GVM?

No. Installing heavier springs or shocks improves load-carrying ability and reduces sag, but it does not legally change your GVM. To legally carry more weight, you must have a certified GVM Upgrade plate fitted by an approved engineer. This calculator is perfect for determining if you need to pursue a GVM upgrade.

Why is Rear Axle Load important?

Many 4WDs exceed their Rear Axle Capacity before they hit their total GVM limit. This happens due to the "cantilever effect" of heavy items behind the rear wheels (like drawers, fridges, spare wheel carriers, and tow ball weight). This tool calculates that leverage to warn you if your rear axle is overloaded.

Need more details? Visit our full FAQ Page