Kerb weight is the weight of a vehicle with all of the components needed for the vehicle to properly function including coolant, fuel, oil and other standard equipment. You will need to know your vehicle's kerb weight if you are looking to find the gross weight of your car since gross weight is calculated by adding kerb weight to the weight of your passengers and cargo weight.
Consult your vehicle's manual and determine the factory-specified amounts of fluid required for the vehicle, including a full tank of petrol or diesel. Fill your vehicle in accordance with this information. Remember to fill all of the liquids and fluids in your vehicle including brake fluid, anti-freeze, transmission fluid, power steering fluid and oil.
Get your vehicle towed to a car service garage or a Department for Transport weigh station, because both facilities will have scales large and strong enough to weigh your vehicle. Have your vehicle weighed as is, without any added cargo or accessories.
Add the weight of one passenger -- use 78 Kg (160 lb) as an average -- to the initial measurement as determined at the garage or weigh station. Match your car or van's weight with a list of vehicle kerb weights. You can find specific vehicle kerb weights online, by consulting your vehicle's manual or directly from your vehicle's manufacturer.
You may be charged a fee for weighing the vehicle.