Towing Weight Calculator
Towing safety is about more than just power. The relationship between your car's weight and the trailer's weight determines how stable and safe your outfit will be on the road, especially at motorway speeds.
Towing Ratio
75.0%
The 85% rule is a recommendation for safe towing stability. Exceeding your car's max towing capacity (1800kg) is illegal.
Frequently Asked Questions
What is the 85% rule?
The UK's major caravanning clubs recommend that the weight of a loaded trailer should not exceed 85% of the car's kerb weight for novice towers to ensure stability.
Is the 85% rule a law?
No, it is a safety recommendation. However, you MUST stay within your car's manufacturer-defined maximum towing capacity, which IS a legal limit.
Where do I find kerb weight?
You can usually find your car's kerb weight in the owner's manual, on the V5C registration document, or on a plate inside the driver's door frame.
What happens if I exceed 100%?
If the trailer is heavier than the car, it can 'lead' the car during braking or cornering, causing dangerous 'snaking' or loss of control.