Towing Caravan Calculator

Calculate Your Towing Ratio

Enter your vehicle and caravan weights below to check your towing compatibility based on the widely recommended 85% rule for optimal safety and stability.

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Enter weights to see your result.

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Caravan MTPLM

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85% Safe Towing Limit

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Est. Recommended Nose Weight (5-7%)

Formula Explained: This calculator uses the Caravan and Motorhome Club’s recommended formula for stability: (Caravan MTPLM / Car Kerb Weight) * 100. A result of 85% or less is considered ideal for experienced towers, while newcomers should aim for an even lower ratio. A ratio over 100% is not recommended and may be illegal.

Results Summary Table

Summary of Towing Weights (kg)

Parameter	Value	Description
Car Kerb Weight	—	The empty weight of your tow car.
Caravan MTPLM	—	The maximum loaded weight of your caravan.
85% Recommended Limit	—	85% of the car’s kerb weight, a key safety guideline.
Towing Ratio	—	Your caravan’s weight as a percentage of the car’s weight.

A) What is a Towing Caravan Calculator?

A towing caravan calculator is an essential tool designed to help you determine if your car can safely and legally tow a specific caravan. It primarily works by comparing the weight of the tow car against the weight of the caravan to calculate a percentage ratio. This ratio is a critical indicator of the stability and safety of your “outfit” (the combined car and caravan). Driving an unstable or overweight outfit is dangerous, leading to snaking, swaying, and significantly increased stopping distances, which can cause accidents. This calculator is for anyone from seasoned caravanners to first-time towers who need to ensure their combination is safe before hitting the road.

B) Towing Caravan Calculator Formula and Explanation

The core principle for safe towing is the “85% rule,” widely advocated by caravanning clubs and safety experts. This rule is not a legal requirement in most places but is a strongly recommended guideline for stability.

Formula: Towing Ratio (%) = (Caravan MTPLM / Car Kerb Weight) * 100

This formula gives you the caravan’s weight as a percentage of the car’s weight. To learn more about how weights affect your vehicle, you can check out our guide on understanding vehicle weights.

Formula Variables

Variable	Meaning	Unit	Typical Range
Car Kerb Weight	The weight of your car ready to drive but without any passengers or cargo. It’s the baseline weight of the vehicle.	kg or lbs	1200 – 2500 kg
Caravan MTPLM	Maximum Technically Permissible Laden Mass. This is the absolute maximum your caravan is allowed to weigh when fully loaded with all your belongings, water, and gas.	kg or lbs	1000 – 2000 kg

C) Practical Examples

Example 1: A Safe Match

• Inputs:
  • Car Kerb Weight: 1900 kg
  • Caravan MTPLM: 1550 kg
• Calculation: (1550 / 1900) * 100 = 81.6%
• Result: The towing ratio is 81.6%. This is an excellent, stable match, well within the 85% guideline, suitable for all drivers.

Example 2: A Marginal / Inadvisable Match

• Inputs:
  • Car Kerb Weight: 1400 kg
  • Caravan MTPLM: 1350 kg
• Calculation: (1350 / 1400) * 100 = 96.4%
• Result: The towing ratio is 96.4%. This is considered a poor match. While it might be legal depending on the car’s official towing limit, it is well above the 85% guideline and could be prone to instability, especially in crosswinds or at higher speeds. Only very experienced drivers should consider such a match, and it’s generally not recommended. For tips on managing your load, see our article on how to load a caravan.

D) How to Use This Towing Caravan Calculator

1. Select Your Units: Choose whether you want to enter weights in kilograms (kg) or pounds (lbs). The calculator will convert everything automatically.
2. Enter Car Kerb Weight: Find your car’s Kerb Weight in the vehicle handbook or on the manufacturer’s website and enter it into the first field.
3. Enter Caravan MTPLM: Find your caravan’s MTPLM on the weight plate near the door or in its manual. Enter this value into the second field.
4. Review Your Results: The calculator instantly provides your towing ratio. The message will tell you if the match is Good (under 85%), requires Caution (85-95%), or is Unsafe (over 95%).
5. Check Intermediate Values: The calculator also shows the 85% safe limit in your chosen units and provides an estimated recommended nose weight, which is another crucial factor for stability.

E) Key Factors That Affect Towing Safety

Beyond the simple weight ratio, several other factors can dramatically impact your towing experience. Using a professional towing caravan calculator is just the first step.

• Nose Weight: The downward pressure the caravan hitch exerts on the car’s towball. Too little or too much can cause instability. It should typically be 5-7% of the caravan’s laden weight.
• Weight Distribution: How you load your caravan is critical. Heavy items should be placed low down and over the caravan’s axle to maintain a low center of gravity.
• Tyre Pressures: Both car and caravan tyres must be inflated to the correct pressures for carrying the extra load. Check your vehicle and caravan handbooks.
• Weather Conditions: High winds can be extremely dangerous when towing, pushing the caravan and causing it to sway. Reduce speed in windy conditions.
• Driver Experience: A novice tower should stick to a much lower towing ratio (e.g., 75-80%) to build confidence. An outfit with a high ratio requires more skill to manage. Our beginner towing guide has more information.
• Vehicle Condition: The state of your car’s suspension, brakes, and engine all play a part. A well-maintained vehicle will be a more stable and reliable tow car.

F) Frequently Asked Questions (FAQ)

1. Is the 85% rule a legal requirement?

No, it is a safety recommendation from experts and clubs. Your legal limit is the maximum towing capacity specified by your car’s manufacturer, but for stability and safety, staying at or below 85% is highly advised, especially for less experienced towers.

2. What happens if my towing ratio is over 100%?

A ratio over 100% means the caravan is heavier than the tow car. This is a very unstable and dangerous combination that is highly prone to “snaking” (where the caravan sways uncontrollably). It may also be illegal if it exceeds your car’s towing limit. You should never tow in this scenario.

3. Where can I find the weights for my car and caravan?

The car’s Kerb Weight is in the owner’s manual or on a plate inside the driver’s door sill. The caravan’s MTPLM is on a plate usually located near the entrance door or on the A-frame.

4. Does the number of passengers in my car affect the calculation?

This specific calculator focuses on the car-to-caravan weight ratio for stability, so it uses Kerb Weight (an empty car). However, passengers and luggage do count towards your car’s Gross Vehicle Weight (GVW) and the outfit’s Gross Train Weight (GTW), which are legal limits you must not exceed. Always ensure you are within these overall limits. Our guide to caravan weights can help.

5. What is nose weight and why is it important?

Nose weight is the downward force from the caravan’s hitch onto the car’s towball. Correct nose weight is vital for stability. Too light, and the back of the car can lift; too heavy, and it can weigh down the rear, affecting steering and grip.

6. Can I switch between kg and lbs in the calculator?

Yes, you can use the dropdown menu to select your preferred unit. The towing caravan calculator will automatically handle all conversions and display the results in the correct context.

7. How should I load my caravan for the best stability?

Place the heaviest items as low as possible and directly over the axle. Medium-weight items can go around them, and only the lightest items should be placed in high-up lockers. Avoid putting heavy items at the very front or very back of the caravan.

8. What should I do if my towing ratio is in the ‘caution’ zone?

If your ratio is between 85% and 95%, you must be extra vigilant. Ensure your nose weight is perfect, your loading is impeccable, and you reduce your speed, especially in poor weather. If you are an inexperienced tower, you should aim to reduce the caravan’s weight or use a heavier tow car.

G) Related Tools and Internal Resources

For more information on safe and enjoyable touring, check out our other guides and tools: