Towing Capacity Calculator
Use this towing capacity calculator to check your vehicle and trailer setup before you tow.
Enter your vehicle GVM, trailer ATM, tow ball download and combined weight to see whether your setup stays within safe limits. Overloading can damage tyres, brakes, wheel bearings and suspension – and it can make your vehicle unstable on the road.
This calculator helps you understand your GVM, GTM and GCM so you can tow with confidence and avoid costly mistakes.
Disclaimer
This towing capacity calculator is provided as a guide only. It does not replace manufacturer specifications, compliance plates or professional weighing.
Vehicle and trailer limits vary by model, year and configuration. Always check your owner manual, compliance plate and official manufacturer ratings before towing.
If you are unsure about your weights, have your vehicle and trailer checked at a certified weighbridge.
You are responsible for ensuring your towing setup complies with all legal and safety requirements.
Towing Capacity Calculator FAQs
How do I calculate my towing capacity?
Towing capacity is set by the vehicle manufacturer. It is the maximum weight your vehicle is rated to tow. However, safe towing also depends on,
• GVM (vehicle weight limit)
• ATM (trailer weight limit)
• GCM (combined weight limit)
• Tow ball download
This calculator helps you check how these limits work together.
What happens if I exceed my towing capacity?
If you exceed towing limits, you may
• Overload tyres
• Overheat brakes
• Damage suspension
• Overstress wheel bearings
• Reduce stability and increase sway
• Risk insurance issues
Even small overloads can create heat and mechanical stress over long distances.
Is towing capacity the same as GVM?
No. Towing capacity is how much your vehicle can pull.
GVM is how much your vehicle can weigh when loaded.
You can be under towing capacity but still exceed GVM if you add too much weight to the vehicle itself.
What is the difference between ATM and GTM?
ATM is the total weight of the fully loaded trailer.
GTM is the weight carried by the trailer wheels when connected to the vehicle.
The difference between them is the tow ball download.
How do I know my GCM?
Your GCM (Gross Combination Mass) is set by the vehicle manufacturer. It is usually listed in
• The owner manual
• The compliance plate
• Manufacturer specifications
If you exceed GCM, you are overloaded – even if GVM and ATM are individually within limits.
Does tow ball download affect GVM?
Yes.
Tow ball download is added to the vehicle weight.
This means heavy ball weight can push your vehicle over its GVM limit.
Is this calculator suitable for caravans and boat trailers?
Yes.
The calculator can be used for:
• Caravans
• Boat trailers
• Horse floats
• Work trailers
• Box trailers
You need accurate weight figures from your compliance plates.
Do I still need to use a weighbridge?
Yes.
This calculator helps you understand limits, but the only way to know your actual loaded weight is to use a certified weighbridge.