Determine the empty weight of your vehicle
Every vehicle comes with an owner’s manual, which mentions the empty weight of the vehicle in the specifications section. Find that manual and look for that section. If you do not have the manual, contact the vehicle’s manufacturer to get the information from there.
Weigh standard equipment
Standard equipment for a vehicle includes the spare tire, jack and other such equipment that comes with the vehicle despite not being a part of it.
Determine the density and capacity of operating consumables
Operating consumables include fuel, engine oil, water, brake fluid, anti-freeze, transmission fluids and steering fluid. Find out their density by either looking at the specifications provided by their manufacturer, or using search engine such as Google.
Determine the vehicle’s volume capacity
Knowing how much fluid goes into your vehicle allows you to determine the weight that it adds to the car.
Calculate the weight of operating consumables
After finding out the capacity of fluids, including fuel tank capacity, in litres or gallons, multiply it by their respective densities to get their weight.
Add weights of operating consumables to empty weight of vehicle
Add up the weight of the vehicle that you determined in the first step, weight of standard equipment that you determined in the second step and the weight of the operating consumables determined in the fifth step to get the curb weight of your vehicle.