Free Online Towing Calculator in United Kingdom UK
A licence-first towing calculator built for British roads and DVSA rules. It works out what you may legally tow based on when you passed your test, checks MAM, gross train weight and noseweight, weighs your setup against the 85 percent guideline, then estimates recovery cost per mile for your region. Built on DVSA guidance and the Construction and Use Regulations.
UK towing calculator
Towing Setup
UK · kg / milesTowing Analysis
Ready when you are
Pop in your vehicle, trailer and licence details, then tap Calculate Towing. You will get a verdict, your licence and weight checks, noseweight, stopping distance and a region cost per mile.
Legal & weight checks
Handling & braking
Weight breakdown
Recommendations
How to put it right
Rules in: London & South East
Standards this check uses
- Licence & weights:
DVSAguidance,C&U Regs 1986 - Towing brackets & couplings:
UNECE R55,ISO 1103 - Trailer braking:
UNECE R13 - Trailer electrics:
ISO 1724,ISO 11992 - Fifth-wheel coupling:
ISO 1726 - Towable mass terms:
ISO 3853
Why this UK towing calculator is built differently
Most British towing tools start with weight. Ours starts with a date, because in this country one date decides almost everything about what you are allowed to pull. If you passed your driving test before the first of January 1997, you walk around with an entitlement that lets you tow combinations up to roughly eight and a quarter tonnes. If you passed after it, your world looks rather different, although the December 2021 rule change handed you a much friendlier allowance than the one your slightly older neighbour spent a weekend sitting a trailer test to earn.
That single fork in the road catches thousands of drivers out every year. Plenty of people happily hitch up a horsebox or a twin-axle caravan with no idea whether their pink licence actually covers it. So this calculator asks the licence question first, answers it plainly, and only then moves on to the weights, the noseweight and the snaking risk that a wet motorway on a windy Tuesday will happily expose.
Licence
The 1997 fork, plus B, B+E, C1 and C entitlements. Answered before anything else, because nothing else matters if you cannot legally drive the combination.
MAM & GTW
Your loaded vehicle against its plate, and the gross train weight against the combined limit. Passengers and luggage count here too.
85% guideline
Loaded trailer against kerb weight. Not law, but the stability target every caravan club quotes, and a fair predictor of a calm tow.
Noseweight
The downward push on the towball, kept inside the lower of the towbar limit and the vehicle limit. Get it wrong and the snaking begins.
How to use the UK towing calculator
Two minutes of prep saves a great deal of roadside embarrassment. Dig out your V5C for the kerb weight and towing limits, glance at the VIN plate on the door pillar for vehicle MAM, and read the small metal plate near the trailer coupling for its MAM. Then work through the steps below.
Pick region
Sets your local recovery cost per mile and the average fuel price for the estimate.
Enter vehicle
Kerb weight, vehicle MAM, and the braked and unbraked towing limits.
Enter trailer
Type and MAM. Noseweight fills itself in for that trailer type.
Set licence
Before or after January 1997, plus any higher categories you hold.
Calculate
Read the verdict, the checks, and the cost per mile for your region.
Our methodology: the rules behind the numbers
A towing tool that hides its sources is just a guess in a nicer font. Here is precisely what sits underneath this one, and why each piece matters on a British road.
DVSA guidance
The Driver and Vehicle Standards Agency sets the towing entitlements, the 750 kg braking line, and the speed limits. The licence logic here mirrors their published rules, including the December 2021 change.
Construction & Use Regulations
The Road Vehicles Construction and Use Regulations 1986 define braking, lighting, mirrors and plating. They are the rules a roadside check is actually quoting when it talks about your trailer.
UNECE R55 & R13
European type approval for mechanical coupling devices (R55) and braking (R13). These underpin the towbar rating and the braked-trailer requirement.
ISO 1724 & ISO 11992
The trailer electrical interface standards. ISO 1724 covers the familiar 13-pin plug, ISO 11992 the heavier CAN-based interface. Why your lights and brakes talk to the trailer.
ISO 1103 & ISO 1726
Coupling balls and fifth-wheel couplings. These set the geometry behind the noseweight logic, especially for heavier and fifth-wheel setups.
ISO 3853
How towable masses are measured and defined. It keeps the gross train weight maths honest and comparable across vehicles.
Recovery cost by UK region and nation
Choose a region in the calculator and these load on their own. Here is the full table for a quick scan. Towing law is the same across Great Britain, with small differences in Northern Ireland, but recovery prices and fuel vary noticeably by area. Figures reviewed June 2026 against RAC and AA benchmarks.
| Region / Nation | Avg recovery / mi | Tow speed (mwy) | Single c'way | Avg fuel / L |
|---|
Frequently asked questions
What can I tow on a normal car licence now?
Since the sixteenth of December 2021, a category B car licence lets you tow a trailer up to 3,500 kg MAM, giving a combined figure of roughly 7,000 kg depending on your vehicle. The category BE gets added to your licence automatically the next time you renew the photocard, so there is no separate trailer test to sit anymore.
If you passed your test before the first of January 1997, you kept an older and more generous acquired right of around 8,250 kg combined. Lucky you. The calculator applies whichever rule matches the date you give it.
Where do I actually find my MAM figures?
The vehicle MAM lives on the VIN plate, a small metal or sticker panel usually tucked on a door pillar, under the bonnet or on the chassis. It is also in your V5C and handbook. The trailer MAM is on its own plate, normally riveted near the coupling or on the A-frame.
One quiet trap: the plated MAM is the figure the law uses, not what the trailer happens to weigh empty today. A lightweight box trailer with a high MAM is treated at its MAM for licensing, so always read the plate rather than guessing from the heft of it.
What is this 85 percent rule everyone mentions?
It is a stability guideline, not a law. The idea is that a loaded trailer should ideally weigh no more than 85 percent of the towing vehicle's kerb weight, particularly if you are newer to towing. Stay under it and the car remains firmly the boss of the relationship. Creep towards 100 percent and the trailer starts having opinions of its own, usually in a crosswind on the M6.
Experienced drivers with a well-sorted, stable outfit do tow above 85 percent quite safely, which is why we show it as a guideline with a clear ratio rather than a pass or fail. It is a nudge, not a fine.
When does my trailer legally need brakes?
Once a trailer's MAM passes 750 kg it must have a working braking system under the Construction and Use Regulations, along with a breakaway cable that applies those brakes if the trailer parts company with your car. Below 750 kg an unbraked trailer is allowed, as long as you stay within your vehicle's unbraked towing limit, which is frequently the lower of 750 kg or half the kerb weight.
The calculator flags an over-750 kg trailer with no brakes as unsafe, because that is exactly the sort of detail that turns a routine roadside check into a long afternoon.
What are the towing speed limits in the UK?
When towing a trailer or caravan you are limited to 60 mph on motorways and dual carriageways, and 50 mph on single carriageways, with the usual lower limits in towns. On a three-or-more-lane motorway you are also barred from the outside lane. These are national limits, so they apply whether you are on the M25 or a quiet road in the Highlands.
The calculator uses these to work out a sensible journey time, then trims it further if your gradient or snaking risk suggests you should ease off.
How accurate is the recovery cost per mile?
It usually sits within about 15 percent of a private operator quote, which mirrors what the RAC and AA quote for their own benchmarks. Most operators charge somewhere around 3 to 5 pounds per mile once you are past the first few miles, plus a call-out fee. We flex that by combined weight, road type, gradient, region and the time of day.
A breakdown at midnight on a bank holiday up a Welsh mountain pass will cost more than the figure here. A daytime tow down the M1 will land close. Treat the number as a planning figure and confirm the real one before they winch you on.
Does the calculator handle hills, wind and bad surfaces?
Yes. Gradient feeds the engine-load and stopping-distance maths, crosswind feeds the snaking risk, and the surface and terrain presets are named for real British conditions, from the flat Fens to a Snowdonia pass. Pick the closest match and you avoid having to invent a multiplier out of thin air.
What if a check comes back red?
Scroll to the "How to put it right" box under the results. It lists fixes in order of effort. The easy wins are usually moving weight out of the car to protect its MAM, nudging the noseweight back into range by shifting trailer load, or fitting a stabiliser to calm the snaking. If your licence does not cover the combination, the honest answer is a quick category check on your driving licence record, or a lighter trailer. The calculator will not pretend a sticker fixes a licence problem.