Cargo Volume

Cargo volume describes the space a vehicle sets aside for luggage and other items, expressed in litres. It exists as a specification because the practical usefulness of a car often comes down to how much it can actually swallow, and a single agreed number lets a buyer weigh a supermini against an estate or a crossover without resorting to guesswork. For most family buyers it is among the handful of figures, alongside fuel economy and price, that decides whether a particular model fits the way they live.

The number is arrived at by physically filling the boot with standardised measuring blocks and counting how many fit, rather than by multiplying length, width and height. The most widely cited method is the German VDA standard, which packs the load area with rigid 200 by 100 by 50 millimetre blocks, each representing one litre, stacking them up to the level of the parcel shelf or window line. Because awkward intrusions such as wheel arches and suspension towers cannot be filled, the VDA figure reflects genuinely usable space. The American SAE J1100 method differs in detail and tends to return larger numbers, which is why a car's quoted capacity can vary between markets.

This matters to the owner because real loads are rarely tidy. A tall, square boot with a low lip will accept a pushchair, flat-pack furniture or a large dog far more readily than a shallow, sloping space of identical litreage, so two cars sharing the same headline figure can feel very different in use. The shape of the aperture, the height of the load floor and whether the rear seats fold completely flat all shape the experience as much as the number itself.

Manufacturers almost always quote two values. The seats-up figure measures the boot behind upright rear seats in everyday family configuration, while the seats-folded figure extends the measurement forward to the backs of the front seats, often two to three times larger. Estates, MPVs and SUVs typically advertise both, whereas a sports car may offer only a token boot and a hatchback splits the difference. Saloons, with their fixed bulkhead and narrow boot opening, frequently lose out to hatchbacks of the same length despite a deceptively large quoted volume.

A few caveats are worth bearing in mind. Some figures are measured to the roof rather than the window line, inflating the total, and a space-saver or full-size spare wheel, or a battery pack in an electric vehicle, can eat into the floor and reduce what is genuinely available. Frunks, underfloor compartments and seatback nets may or may not be included. Reading cargo volume alongside load-floor height, overall length and seating capacity therefore gives a far truer picture of how practical a car will prove than the litre figure alone.