UK Towing MAM Calculator
How to Use a Towing MAM Calculator for UK Drivers
Towing a trailer? You need to know your Maximum Authorised Mass (MAM) limits to stay legal and safe on UK roads. Here’s how to use a towing MAM calculator effectively.
What Is MAM?
MAM (Maximum Authorised Mass) is the maximum weight your vehicle or trailer can legally weigh when fully loaded. Exceeding this limit risks fines, penalty points, or invalidated insurance.
Step 1: Find Your Vehicle’s MAM
Check your vehicle’s VIN plate or registration documents. Common car MAMs range from 2,000kg to 3,500kg. Trailers typically show MAM on a metal plate near the coupling.
Step 2: Know Your License Restrictions
Pre-1997 Licenses: Can tow up to 8,250kg combined MAM (vehicle + trailer).
Post-1997 Licenses: Limited to 3,500kg vehicle MAM + 3,500kg trailer MAM (7,000kg total).
Need heavier loads? You’ll require a Category B+E license.
Using the Calculator
Enter your vehicle’s MAM.
Enter the trailer’s MAM.
Select your license type.
Click “Calculate.”
The tool instantly shows if your setup is legal and highlights DVLA compliance issues.
Why This Matters
In 2022, over 1,200 drivers were fined for towing violations in the UK. Common mistakes include guessing weights or ignoring license upgrades after 1997.
Pro Tips
Weigh your loaded trailer at a weighbridge.
Factor in passengers, fuel, and equipment.
Check tyre ratings match your MAM.
Need a Heavier Setup?
Consider a commercial trailer license (Category C1+E) for combinations over 7,000kg. Training typically takes 3-5 days.
Stay Safe
Even if legal, uneven loads or poor maintenance cause 18% of UK towing accidents. Distribute weight evenly and check brakes/lights before driving.
A towing MAM calculator removes the guesswork. Use it before hitching up to avoid costly mistakes and keep roads safe for everyone.