Guinea pig cage size: how big it really needs to be

What size cage do 2 guinea pigs need?

Two guinea pigs need at least 10.5 sq ft (about 1 m²) of floor space. In practice that means a cage around 76 × 127 cm (30 × 50 in), or a 2 × 4 grid C&C cage, which measures about 70 × 140 cm (27 × 56 in) inside.

Welfare groups give slightly different numbers, but they land in the same place. The Humane World for Animals gives 7.5 sq ft (0.7 m²) as the bare minimum for two and 10.5 sq ft as preferred. RSPCA Australia says a pair needs at least 2 × 0.5 m (79 × 20 in), which is 1 m². Wood Green, a UK charity, asks for 153 × 61 cm (5 × 2 ft) for two females. The MSD Vet Manual says 7 sq ft (0.65 m²) for one guinea pig plus 2 to 4 sq ft for each extra one, which gives 9 to 11 sq ft for a pair. We follow 10.5 sq ft as the minimum, because it is the figure most of these agree on, and a bit of extra room costs far less than a stressed pair.

The PDSA asks for the most: a 1.5 × 1 m (59 × 39 in) hutch with a 2 × 1 m (79 × 39 in) run attached. If you have the room, that is a lovely setup.

Guinea pig cage size by number of guinea pigs

Here is how the main guidelines compare, from the smallest acceptable to the size we would aim for.

Wood Green notes that groups of four or more usually need a larger indoor setup or a converted shed. See our guide to guinea pig pairs and groups for which combinations get on.

What is the minimum size cage for guinea pigs?

The lowest figure any welfare group gives for two guinea pigs is 7.5 sq ft (0.7 m²), from the Humane World for Animals, and it calls this a minimum, not a recommendation. Below that, guinea pigs cannot run, and the Humane World notes that larger spaces are easier to keep clean because waste does not build up as fast.

Some older care sheets give much smaller numbers, such as 2 sq ft per guinea pig. We do not follow those. Guinea pigs are active for most of the day and night, and the RSPCA says they need space large enough to exercise in. A cage they can only turn around in gives them nowhere to run.

How to measure a guinea pig cage

1. Measure the floor, inside. Measure the length and width of the base where the guinea pigs walk, not the top of the bars or the outside of the box.
2. Work out the area. In metric, multiply length by width in centimetres and divide by 10,000 for square metres. In inches, multiply length by width and divide by 144 for square feet.
3. Take off what does not count. Lofts, shelves and second floors do not count, says Metropolitan Guinea Pig Rescue, because guinea pigs need ground space to run.
4. Check the width. A cage narrower than about 60 cm (2 ft) leaves no room to turn and pass each other, even if it is long.
5. Compare with the table. If you are short, add a run or playpen joined to the cage, open for as many hours a day as you can.

C&C cage sizes for guinea pigs

C&C (cubes and coroplast) cages are built from wire storage grids, each about 35 cm (14 in) square, around a plastic base. Many rescues recommend them because you can build exactly the size you need. Metropolitan Guinea Pig Rescue says a 2 × 3 suits one or two guinea pigs and a 2 × 4 suits two or three. We would treat the 2 × 4 as the real starting point for a pair.

Sizes are worked out from the 35 cm (14 in) grid and vary a little by brand, so check the inside measurement of any kit before you buy.

Do boars need a bigger cage?

Yes. Two males sharing a small cage are more likely to fall out. Wood Green asks for 182 × 61 cm (6 × 2 ft) for two boars, about 12 sq ft (1.1 m²), against 153 × 61 cm (5 × 2 ft) for two sows or a neutered boar and sow, and says to give males as much room as you can.

How tall should a guinea pig cage be?

Sides of at least 30 cm (12 in) are enough for guinea pigs, which do not climb or jump high. The RSPCA says they need room to stand fully upright, and about 30 cm (12 in) for young guinea pigs to do their "frisky hop". The Humane World asks for sides of at least 30 cm (12 in), and vet guides from the University of Florida and the MSD Vet Manual suggest about 46 cm (18 in). An open top is fine if no cats, dogs or small children can reach in.

Large indoor cages for guinea pigs: what to look for

A good large indoor cage has a solid, waterproof base at least 1 m² (10.5 sq ft), sides you can open fully for cleaning, and a single level. Avoid wire floors, glass tanks and deep plastic tubs, which the Humane World and Metropolitan Guinea Pig Rescue both say trap stale air. Most pet shop cages are smaller than they look, so check the base size before anything else.

Our pick of the best guinea pig cages lists ones that meet these sizes. Once you have the space, our guinea pig cage setup guide shows how to lay it out, and our bedding guide covers the floor.

Is floor time a substitute for a bigger cage?

It helps, but it does not replace one. Guinea pigs are awake and moving around the clock, so the home they live in at 3 am matters as much as their play time. If your cage is at the bare minimum, add a run or pen for several hours every day, ideally attached so they can come and go. Read guinea pig floor time and playpens for safe setups, and our complete guinea pig care guide for everything else.