Will It Fit in My Car? Car and Van Payload Calculator
Add what you're buying and we'll tell you whether it's within your vehicle's payload, whether anything is too long, and how many trips you'll need.
Will It Fit in My Car?
What are you loading?
You need
575kg total
128% of a 450kg payload — 500kg of materials plus 75kg of people
- Materials
- 500 kg
- Spare for load
- 375 kg
- Trips needed
- 2
- Heaviest item limit
- 15 per trip
How we worked this out
Over the payload. Split it into 2 trips, take fewer passengers, or have it delivered.
Bulk bags (850kg) and fence panels are delivery-only — they cannot go in a car.
Typical UK vehicle payloads and load lengths
| Vehicle | Typical payload | Max load length | 25kg bags (1 driver) |
|---|---|---|---|
| Small hatchback | 450 kg | 1.4 m | 15 |
| Family hatchback | 500 kg | 1.4 m | 17 |
| Estate | 550 kg | 1.8 m | 19 |
| SUV | 600 kg | 1.7 m | 21 |
| Small van | 800 kg | 1.8 m | 29 |
| Medium van | 1,100 kg | 2.6 m | 41 |
How this calculator works
Every vehicle has a payload: the maximum weight of people and cargo it is allowed to carry. Find it by taking the gross vehicle weight and subtracting the kerb weight — both are on the VIN plate inside the driver's door frame, and in the handbook. Our presets are typical figures; your actual car may differ by 100kg or more, so use the real number.
We add up the weight of your materials, add the people on board at 75kg each, and compare the total with the payload. The bar turns amber past 80% and red over 100%. We also check the length of each item against the load space with the seats down, because a plasterboard sheet at 2.4m simply will not go in a hatchback however light it is.
Where the load is too heavy, we work out how many trips it takes with the driver and passengers still on board — because their weight comes off the payload every time.
Worked example: 20 bags of cement
20 × 25kg is 500kg of cement. Add one driver at 75kg and you are at 575kg against a small hatchback's 450kg payload — 128% of the limit. With the driver on board there is 375kg spare, so the maximum is 15 bags per trip and you need 2 trips.
Two 15-mile round trips will cost around £12 of fuel and most of a morning. A merchant delivery for the same order is typically £30–£45 and arrives on a pallet, which is why most people building anything of size get it dropped off.
Loading safely
Keep heavy weight low and as far forward as possible — ideally over or just in front of the rear axle. Stacking bags high against the tailgate lifts weight off the front wheels and makes the steering vague exactly when you need it. Spread bags across the boot floor rather than piling them in one corner.
Put a sheet of plywood or a heavy-duty liner down first. Sand and cement bags leak, wet slabs mark boot carpet permanently, and a burst 25kg bag of cement is a genuinely miserable thing to clean out of a car.
Pump the tyres up to the laden pressure in the handbook; most cars have a higher figure for a full load, and it makes a noticeable difference to handling. Leave more braking distance than usual, take speed bumps and roundabouts gently, and remember that a loaded car takes considerably longer to stop.
Anything protruding more than one metre beyond the back of the vehicle must be clearly marked so other road users can see it. Beyond two metres you need an attendant and to notify the police. Long timber and boards are far better strapped to a proper roof rack — and check the roof load limit, which on many cars is only 75kg.
Tips from the trade counter
- Ask about the delivery threshold. Many merchants deliver free over £150–£300 in the local area.
- Hire a van for an hour. Cheaper than two days of trips, and far kinder to your car's suspension.
- Buy small bags for small jobs. 20kg aggregate bags handle much better than a bulk bag you cannot move.
- Count the passengers. A family of four eats 300kg of payload before you load a single bag.
- Take straps. Unsecured loads move under braking, and a 25kg bag in motion is dangerous.
Overloading and the law
Driving a vehicle over its gross vehicle weight or an axle limit is a road traffic offence in the UK. Penalties include fixed fines and, for serious overloading, court action. Insurers may also decline a claim if the vehicle was overloaded at the time of an accident.
Rules on projecting loads, trailers and towing weights vary with your licence category. Check the current guidance on GOV.UK, and check with your local council if you need to load or unload somewhere with parking restrictions.
Frequently asked questions
How do I find my car's payload?
Take the gross vehicle weight (the maximum laden weight) and subtract the kerb weight. Both are on the VIN plate inside the driver's door frame or in the handbook. The payload includes everyone in the car, not just the boot.
Is overloading a car illegal?
Yes. Exceeding the gross vehicle weight or an axle limit is an offence, can lead to a fine and points, and insurers may refuse a claim. Overloaded cars also brake and steer far worse than drivers expect.
How many bags of cement can I carry?
A small hatchback with a 450kg payload and one driver has about 375kg spare — that is 15 × 25kg bags. A medium van at 1,100kg will take a full pallet's worth in one go.
Can I get a bulk bag in my car?
No. A bulk bag holds around 850kg and needs mechanical handling. Bulk bags are delivery-only and are craned off a lorry.
Will fence panels fit in a car?
A 1.83m panel might physically fit in a large estate, but panels are awkward, catch the wind and damage easily. Most merchants treat panels as a delivery item, and it is usually the sensible choice.
How long a length of timber can I carry?
With the seats down, a family hatchback takes about 1.4m, an estate 1.8m and a medium van 2.6m. Anything protruding more than 1m beyond the rear must be clearly marked, and more than 2m needs an attendant and police notification.
Is it cheaper to pay for delivery?
Very often, yes. Two 20-mile round trips in fuel plus your morning frequently costs more than a £30–£50 merchant delivery, and the materials arrive on a pallet without breaking your suspension.