Enter your vehicle and caravan weights below to check GVM, ATM, GCM, towing capacity and towball weight against Australian legal limits — for free, in under two minutes.
Last updated: March 2026 · Reviewed by the KamperHub towing compliance team
Select your vehicle and caravan below to see if they're compatible. For a full compliance check with cargo, passengers and towball weight, sign up free.
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This caravan towing weight calculator checks whether your vehicle and caravan are within legal towing limits. It compares your inputs against GVM, ATM, GCM, payload, and towball weight to show if your setup is compliant. The result makes it clear whether your combination is safe, borderline, or overweight before you hit the road.
Your vehicle's maximum loaded weight, including passengers, fuel, cargo and the towball download from your caravan. KamperHub compares your actual loaded weight against your vehicle's GVM rating and shows a clear pass or fail.
Your caravan's maximum loaded weight, including everything packed inside it. We check your caravan's actual weight (tare plus cargo) against its ATM rating. Exceeding ATM is the most common compliance failure.
The maximum combined weight of your vehicle and caravan together. Even if each is under its individual limit, the combination might exceed your vehicle's GCM. This is the hidden limit that catches experienced towers off guard.
The maximum weight your vehicle is rated to tow. This is set by the vehicle manufacturer and considers engine power, transmission, brakes, and chassis strength. KamperHub checks your caravan's loaded weight against this limit.
The downward force your caravan applies to the towball. In Australia, this should sit between 8% and 14% of your caravan's loaded weight. Too little causes sway; too much overloads your rear axle. KamperHub calculates your percentage automatically.
It takes less than two minutes. Here's how it works:
Pick your vehicle from our database of Australian tow vehicles. KamperHub automatically loads the manufacturer specs — GVM, GCM, towing capacity, kerb weight and towball limit. No manual data entry required.
Choose your caravan from the database. We load the tare weight, ATM, and ball weight specs directly from the manufacturer data. If your model isn't listed, you can enter the specs manually from your compliance plate.
Tell us what you're carrying — passengers, water, gas, fuel level, and any additional cargo. KamperHub calculates the total loaded weight for both your vehicle and caravan.
KamperHub checks every weight limit and shows you a clear dashboard with pass/fail indicators for GVM, ATM, GCM, towing capacity and towball percentage. If anything is over, you'll know exactly what to fix.
GVM is the maximum your vehicle can weigh when loaded, while ATM is the fully loaded weight of your caravan. GCM is the combined maximum weight of both together. Payload is how much weight your vehicle can carry, and towball weight is the downward force applied by the caravan onto the vehicle's towbar.
The weight of your caravan as it leaves the factory — empty, with no water, gas, or personal belongings. This is the starting point for all weight calculations.
Aggregate Trailer Mass. The maximum your caravan can weigh when fully loaded, including everything inside it and the weight on the towball.
Gross Trailer Mass. The maximum weight supported by the caravan's own axles (ATM minus towball download). This is what a weighbridge measures when only the caravan's wheels are on the scale.
Gross Vehicle Mass. The maximum your tow vehicle can weigh fully loaded — passengers, fuel, cargo, and towball download included.
Gross Combined Mass. The maximum total weight of your vehicle plus caravan. Set by the vehicle manufacturer.
The weight of your vehicle with a full tank of fuel but no passengers or cargo. Similar to tare weight for caravans.
The available carrying capacity. For vehicles: GVM minus kerb weight. For caravans: ATM minus tare weight. This is how much stuff you can actually put in.
The downward force the caravan exerts on the vehicle's towball. Affects both the vehicle's GVM (adds to its load) and the caravan's GTM (subtracted from ATM).
Exceeding weight limits has real consequences — fines, voided insurance, and dangerous towing. Here's what's at stake.
If you're in an accident while overweight, your insurer can reject your claim entirely. A single weight check before each trip protects you from catastrophic financial loss.
Australian states issue on-the-spot fines for overloaded vehicles and caravans. Penalties range from $400 to over $5,000 depending on the state and severity. Defect notices can ground your rig on the spot.
Overloaded vehicles take longer to stop, are harder to steer, and are more prone to tyre blowouts. Incorrect towball weight causes dangerous caravan sway at highway speeds. Proper weight management is the foundation of safe towing.
Consistently exceeding weight limits accelerates wear on your transmission, brakes, tyres and suspension. Towing within limits means your vehicle lasts longer and costs less to maintain.
A caravan towing calculator is accurate when you enter real, measured weights rather than brochure figures. Manufacturer numbers assume an empty vehicle and caravan, while real setups include passengers, gear, accessories, and water. For best accuracy, use weighbridge measurements and treat the calculator as a compliance check, not a rough estimate.
Your vehicle's GVM, GCM, and towing capacity (owner's manual or door sticker). Your caravan's tare weight and ATM (compliance plate). KamperHub loads these automatically if your model is in our database.
Your vehicle might have a 3,500 kg towing capacity — but if your GCM or GVM is exceeded first, you're still overweight. KamperHub checks all five limits simultaneously, not just one.
A weighbridge gives the most precise reading. But for routine checks, enter your known cargo weights into KamperHub and you'll know if you're within limits — without leaving the driveway.
You need to compare your vehicle's towing capacity (found in the owner's manual or on the compliance plate) against your caravan's ATM (Aggregate Trailer Mass). Your vehicle must also stay within its GVM (Gross Vehicle Mass) when loaded with passengers, fuel, and gear. KamperHub's free calculator checks all of these limits for you automatically.
GVM (Gross Vehicle Mass) is the maximum your vehicle can weigh when fully loaded — including passengers, fuel, cargo, and the towball download from your caravan. Exceeding your GVM is illegal in Australia, voids your insurance, and makes your vehicle harder to steer and stop. It's the single most commonly exceeded limit for caravan owners.
ATM (Aggregate Trailer Mass) is the maximum your caravan can weigh when fully loaded, including everything inside it plus the weight pressing down on the towball. It's set by the caravan manufacturer and stamped on the compliance plate. You must never exceed your caravan's ATM rating.
GCM (Gross Combined Mass) is the maximum weight of your vehicle AND caravan combined. Even if your vehicle is under its GVM and your caravan is under its ATM, the total combination might still exceed your vehicle's GCM limit. This is often the hidden limit that catches people out — especially with larger caravans.
In Australia, your towball download (the weight your caravan pushes down on the towball) should be between 8% and 14% of the caravan's loaded weight. Too little towball weight causes dangerous sway at highway speeds. Too much overloads the rear axle of your tow vehicle. KamperHub calculates your towball percentage automatically.
If your caravan or vehicle combination exceeds legal weight limits, you face roadside defect notices, on-the-spot fines (up to $5,000+ in some states), loss of licence points, and — critically — voided insurance. If you're in an accident while overweight, your insurer can refuse to pay your claim entirely. Prevention through proper weight checking is essential.
Best practice is to check your weights whenever your load changes significantly — a different trip with different gear, adding new accessories, or carrying extra water and fuel. KamperHub lets you save your vehicle and caravan specs and track what you're carrying, so you can check compliance digitally without visiting a weighbridge every time.
Yes. KamperHub's weight compliance dashboard is available on the free plan. It checks your GVM, ATM, GCM, towing capacity, and towball percentage. For advanced features like the tow simulator, weight distribution analysis, and cargo zone tracking, you can upgrade to the Pro plan.
KamperHub uses manufacturer-published specs for vehicle and caravan weights (GVM, ATM, GCM, tare, kerb weight). The calculator is as accurate as the data you provide — if you enter your actual cargo, water, fuel and passenger weights, the results closely match what a weighbridge would show. For the most precise result, weigh your loaded setup at a public weighbridge and compare.
A weighbridge gives the most accurate measurement, and we recommend it for your first trip with a new setup. However, you can use KamperHub's calculator for ongoing checks — enter your known cargo weights and it will tell you if you're within limits. Many experienced towers use the calculator for routine checks and a weighbridge for annual verification.
Yes. Exceeding any rated weight limit (GVM, ATM, or GCM) is illegal in all Australian states and territories. Penalties include on-the-spot fines from $400 to over $5,000, defect notices that ground your vehicle until rectified, loss of licence points, and critically — voided insurance. If you cause an accident while overweight, you could be personally liable for all damages.
The only app that checks what the inspectors actually check. Free to use, no credit card required.
Get Started Free →The calculator tells you if you're compliant. These guides help you understand why — and what to do if you're not.
Go beyond pass/fail. Visualise weight distribution across cargo zones, see sway risk, and experiment with loading — all before you pack.
Where should heavy items go? What causes sway? The complete guide to loading your caravan safely, with diagrams.
Penalties from $400 to $5,000+, defect notices, and voided insurance. State-by-state breakdown of what happens when you get caught.
Plan your route with fuel stops, free camping, weather and fatigue management — all built for vehicles towing caravans.