Car Boot Capacity Calculator

People decide to buy a new car based on a variety of preferences and priorities. One factor that can significantly impact driving comfort, especially if you have a family, is the size of the cargo area.

It’s hard to figure out the best trunk size based on measurements or liters of capacity alone. That’s why we’ve created this simple calculator.

Answer a few questions, and our the car boot capacity calculator will help you determine the optimal boot space volume for your needs.

Car Boot Capacity Calculator

Estimate how much cargo fits in your boot — by volume, weight, or number of items.

Boot dimensions

Boot length

Boot width

Boot height

What you’re loading

Item length

Item width

Item height

Item weight (optional)

kg per item

Boot load limit

Max payload capacity (optional)

kg — check your car manual

Packing efficiency

Please fill in all boot and item dimensions with values greater than zero.

Results

Items that fit (volume)

—

Usable boot volume

—litres

Volume used

—litres

Boot fill level

0% full

***

Formula used

Boot volume (cm³)   = Length × Width × Height
Usable volume (cm³) = Boot volume × Packing efficiency factor
Items that fit      = ⌊ Usable volume ÷ Item volume ⌋
Fill %              = (Items × Item volume) ÷ Boot volume × 100

The packing efficiency factor accounts for real-world gaps between items:

70% → practical/mixed shapes (default)
85% → neat uniform boxes
55% → bulky/irregular cargo
100% → theoretical maximum (no gaps)