The best rat cages, measured rather than described

Buy the MidWest Critter Nation Double Unit. It is the only widely available cage in the United States that puts two tiers, 6 square feet of usable floor per tier and half-inch bar spacing in the same product, and the half-inch is the specification that decides whether a young rat stays inside it. The Savic Royal Suite 95 beats it on every number and is harder to buy here. The Ferret Nation 182 is the same cage as the Critter Nation with one-inch bars, and that single difference is why it is on this page as a warning rather than a recommendation.

Rats are housed in exactly three cages by most of the people who keep them seriously, and all three are marketed at a different species. That is not an accident of fashion. A rat needs a tall, multi-level, half-inch-barred wire enclosure, and the only manufacturers building that at scale are building it for ferrets and chinchillas. So a rat cage roundup is mostly an exercise in reading ferret cage specifications carefully, which is convenient, because bar spacing is the specification this site already treats as decisive for the species next door.

What makes this category unusual is the state of the published evidence. There is no single figure to measure against. The RSPCA publishes none at all. The MSPCA publishes one that is small. A peer-reviewed expert panel in the Veterinary Record publishes one that is three to four times larger. All three are real, all three are cited below, and we are not going to collapse them into a tidy number that nobody actually published. Rat cage size works through the disagreement in full.

The criteria, in the order they are applied

1. 1.Bar spacing, first and as a pass or fail. Half an inch or less. The MSPCA states 1/2in apart for rats; the RSPCA states the gap must be small enough to stop a rat poking its head through, and notes that once the head is through the whole body follows. A cage that fails this is named as failing it, however large it is.
2. 2.Usable floor per level. The continuous area an animal can actually walk across, our own arithmetic from the manufacturer's listed dimensions, shown so you can redo it. Ramps, shelves and hammocks do not count.
3. 3.Height and tiers. The Veterinary Record consensus puts the floor at 90-120cm of height and a minimum of two tiers. This is the criterion that eliminates single-unit cages, and it is the one most commonly ignored, because height is the cheapest specification for a manufacturer to cut.
4. 4.Floor material. Solid, not wire mesh. Both the MSPCA and the RSPCA name wire floors as a cause of foot injury, and the RSPCA states it plainly as a requirement rather than a preference.
5. 5.Cleaning access, last. A cage you clean weekly for three years is a cage whose doors you have to live with. It does not outrank a safety specification, and on this page it only ever breaks a tie.

#	Product	Best for	Score	Price
1	Illustrative MidWest Critter Nation Double Unit (162)36 x 24 = 864 sq in (6 sq ft) per level, two levels	Ferrets of any age, and kits especially	9.5out of 10	Check price on Amazon→ We do not print prices. #ad Disclosure
2	Illustrative Savic Royal Suite 95 Rat and Ferret Cage95 x 63 cm = 5,985 cm2, about 928 sq in (6.4 sq ft) per level	Two ferrets that sometimes need separating	9.2out of 10	Check price on Amazon→ We do not print prices. #ad Disclosure
3	Illustrative MidWest Critter Nation Single Unit (161)36 x 24 = 864 sq in (6 sq ft), one level	A single ferret, or a first half of a double	8.3out of 10	Check price on Amazon→ We do not print prices. #ad Disclosure
4	Illustrative MidWest Ferret Nation Double Unit (182)36 x 25 = 900 sq in (6.25 sq ft) per level, two levels	Adult ferrets that climb	8.6out of 10	Check price on Amazon→ We do not print prices. #ad Disclosure
5	Illustrative Prevue Pet Products Feisty Ferret Home 48531 x 20 = 620 sq in (4.3 sq ft) per level	A smaller room and a single adult ferret	6.4out of 10	Check price on Amazon→ We do not print prices. #ad Disclosure

Scores are our own assessment of published specifications against the thresholds set out in how we assess products. They are not test results and not customer ratings. Tap a row to read the full assessment.

The specifications side by side

Two things fall out of that table immediately. The first is that bar spacing is the only column where the cages genuinely differ in kind rather than in degree: four of the five give between 4.3 and 6.4 square feet per level, which is the same cage repeated, but the gap between a half-inch bar and a one-inch bar is the difference between an enclosure and a doorway. The second is that width is the specification nobody advertises and almost everything fails. The Veterinary Record panel put the floor at 90-120cm; four of these five cages sit at 91 to 95cm, which is the bottom of that band and not the middle of it.

Why two ferret cages are on a rat page as warnings

The Ferret Nation 182 and the Critter Nation 162 are, physically, close to the same object. Same frame, same full-width doors, same deep pans, same rolling stand, floor areas within half a square foot of each other. The Ferret Nation usually costs less. Searched for side by side, there is no visible reason to pay more.

The reason is one inch against half an inch. A grown male rat will not fit through either. A four-month-old, a small female, or any rat that has lost condition during an illness will put its head through a one-inch gap, and the RSPCA's sentence on this is the one to keep: once the head is through, the whole body follows. The failure is not usually a dramatic escape. It is finding an animal behind a bookcase at two in the morning, or not finding it at all.

The Prevue 485 fails the same filter at 7/8 of an inch and fails on width as well, at 79cm against a 90cm floor. It is a competent small ferret cage. It is on this page because people buy it for a pair of rats on the strength of its height, and the floor underneath that height is 4.3 square feet, which is the smallest here by a third.

What a rat cage needs that a specification sheet will not tell you

The Veterinary Record consensus contains three requirements no manufacturer prints on a box, and they change what you buy almost as much as the cage does.

• A digging box filled to at least one body length deep. The panel names coco-soil or crinkle-cut paper. This is a tub inside the cage, not the cage substrate, and it is the single cheapest piece of enrichment in this category.
• A solid-floored wheel over 16 inches. That is larger than any wheel in our hamster wheel roundup and larger than most products sold as rat wheels. Our wheel assessments stop at 12.8in, so we have no shortlist here and are not going to invent one.
• One to two hours a day outside the cage, minimum. No enclosure substitutes for it. If that time does not exist in your week, the honest answer is a different species rather than a bigger cage.
• One more shelter than there are rats. The RSPCA's wording, and it is specific: shelters must have multiple exits, and all the rats must be able to sleep in one together if they choose. Cardboard tubes count and cost nothing.

The assessments

Our pick · Ferrets of any age, and kits especially

MidWest Critter Nation Double Unit (162)

The half-inch bar spacing is the whole argument: it is the same cage as the Ferret Nation with a gap a ferret kit cannot get its head through.

✓ Clears our threshold6 sq ft per level and 1/2 in bars

Dimensions

36 x 24 x 63 in including the rolling stand

Continuous floor

36 x 24 = 864 sq in (6 sq ft) per level, two levels

Bar spacing

1/2 in horizontal

Material

Powder-coated steel with deep removable plastic pans

Levels and ramps

Two levels with a locking swing-up ramp and full-width doors

What it gets right

• +1/2 in bar spacing holds a kit that 1 in spacing does not
• +6 sq ft of usable floor per level, comfortably over our per-level bar
• +Full-width doors mean you can reach every corner, which matters weekly
• +Deep pans contain litter rather than spreading it

What it gets wrong

• −Horizontal half-inch bars give less climbing purchase than wider spacing
• −Heavy and awkward to assemble alone
• −The stand's casters roll on hard floors more than you want them to

Who should buy something else

Not necessary if your ferrets are adults and you have measured their head width against 1 in. The Ferret Nation costs less and climbs better; the half-inch is insurance you may not need.

Specifications read from MidWest product listing and retailer specifications on 27 September 2026. Floor-area arithmetic is ours and is shown above so you can redo it.

Illustrative

Our assessment9.5/10

• Bar spacing safety10
• Usable floor per level9
• Cleaning access10
• Build quality9
• Escape resistance10

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Number 2 · Two ferrets that sometimes need separating

Savic Royal Suite 95 Rat and Ferret Cage

The most floor per level of the three big ferret cages and the only one that splits into two separate cages, at 13mm spacing that is functionally the Critter Nation's half-inch.

✓ Clears our threshold6.4 sq ft per level and 13mm bars

Dimensions

95 x 63 x 159 cm (37.4 x 24.8 x 62.6 in)

Continuous floor

95 x 63 cm = 5,985 cm2, about 928 sq in (6.4 sq ft) per level

Bar spacing

13mm (about 1/2 in)

Material

Powder-coated steel with horizontal and vertical mesh, made in Belgium

Levels and configuration

Two levels that can be split into two separate cages

What it gets right

• +928 sq in per level, more than either MidWest cage
• +13mm spacing is effectively the half-inch standard
• +Splits into two independent cages, which solves introductions and illness
• +Horizontal bars give climbing purchase that half-inch horizontal mesh usually loses

What it gets wrong

• −Harder to buy in the US than the MidWest cages, and spares are harder still
• −159cm tall, so the top level is above eye level for many owners
• −Costs more than the Critter Nation

Who should buy something else

Not the sensible pick if you want next-day spares and a replacement pan from a local retailer. That is where the MidWest cages win regardless of specification.

Specifications read from Savic specifications via retailer listing on 27 September 2026. Floor-area arithmetic is ours and is shown above so you can redo it.

Illustrative

Our assessment9.2/10

• Bar spacing safety10
• Usable floor per level10
• Cleaning access9
• Build quality10
• Configurability10

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Number 3 · A single ferret, or a first half of a double

MidWest Critter Nation Single Unit (161)

The same 6 sq ft floor and the same half-inch bars in one level, which is the right buy only if you are certain you will add the second unit.

✓ Clears our threshold6 sq ft on one level, 1/2 in bars

Dimensions

36 x 24 x 25.625 in for the cage section

Continuous floor

36 x 24 = 864 sq in (6 sq ft), one level

Bar spacing

1/2 in horizontal

Material

Powder-coated steel with a deep removable plastic pan

Levels and ramps

One level, with a shelf; a second unit stacks on top later

What it gets right

• +Identical 1/2 in bar spacing safety
• +6 sq ft of usable floor
• +Cheaper entry point, and the 162 upper unit fits it later

What it gets wrong

• −One level gives a ferret much less vertical variety than two
• −Buying the single then upgrading costs more than buying the double outright

Who should buy something else

Wrong for two or more ferrets. One level of 6 sq ft is enough floor and nowhere near enough structure for a pair that will spend their waking hours in it.

Specifications read from MidWest product listing on 27 September 2026. Floor-area arithmetic is ours and is shown above so you can redo it.

Illustrative

Our assessment8.3/10

• Bar spacing safety10
• Usable floor per level9
• Cleaning access10
• Build quality9
• Vertical space4

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Number 4 · Adult ferrets that climb

MidWest Ferret Nation Double Unit (182)

Slightly more floor per level than the Critter Nation and a one-inch bar gap, which is fine for a grown ferret and the reason kits escape.

≈ Clears part of itFloor passes; 1 in bars fail our half-inch filter for kits

Dimensions

36 x 25 x 62.5 in including the rolling stand

Continuous floor

36 x 25 = 900 sq in (6.25 sq ft) per level, two levels

Bar spacing

1 in

Material

Powder-coated steel with deep removable plastic pans

Levels and ramps

Two levels with locking swing-up ramps and ramp covers

What it gets right

• +6.25 sq ft per level, marginally more than the Critter Nation
• +1 in bars give much better climbing purchase
• +Same full-width doors, deep pans and locking ramps
• +Usually cheaper than the equivalent Critter Nation

What it gets wrong

• −1 in spacing is the single reason ferret kits get out of this cage
• −No way to retrofit narrower spacing; the fix is a different cage or wire panels

Who should buy something else

Never for kits, and not for a small jill who can flatten her head through a one-inch gap. Measure the animal, not the marketing, and buy the Critter Nation if there is any doubt.

Specifications read from MidWest product listing on 27 September 2026. Floor-area arithmetic is ours and is shown above so you can redo it.

Illustrative

Our assessment8.6/10

• Bar spacing safety6
• Usable floor per level10
• Cleaning access10
• Build quality9
• Climbing10

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Number 5 · A smaller room and a single adult ferret

Prevue Pet Products Feisty Ferret Home 485

A cheaper multi-level cage whose 4.3 sq ft per level and 7/8 in bars both land below the standards we apply, which is the honest reason it is last here.

✗ Falls below our threshold4.3 sq ft per level and 7/8 in bars

Dimensions

31 x 20 x 54 in with the stand, 41.5 in high without it

Continuous floor

31 x 20 = 620 sq in (4.3 sq ft) per level

Bar spacing

7/8 in

Material

Powder-coated wire with removable platforms, grille and debris tray

Included fittings

Ramps, shelves and a hammock supplied

What it gets right

• +Fits a 31 in footprint where the MidWest cages need 36 in
• +Hammock, ramps and shelves included
• +Removable grille and tray make cleaning straightforward

What it gets wrong

• −620 sq in per level is 28 percent less than the Critter Nation
• −7/8 in bar spacing is close enough to 1 in to carry the same kit risk
• −Lighter gauge wire than the MidWest and Savic cages

Who should buy something else

Not for kits, not for two ferrets, and not if you can fit a 36 in cage. It solves a space problem and does nothing else better.

Specifications read from Prevue Pet Products listing on 27 September 2026. Floor-area arithmetic is ours and is shown above so you can redo it.

Illustrative

Our assessment6.4/10

• Bar spacing safety5
• Usable floor per level5
• Cleaning access8
• Build quality6
• Value8

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What we would buy

The Critter Nation 162, for almost everyone. Half-inch bars, two tiers of 6 square feet, a height that clears the published band with room over it, full-width doors that let you reach the back corner of a cage you will be cleaning every week for three years, and pans and spares you can replace without importing anything. It is not the best cage here on paper and it is the one we would own.

The Savic Royal Suite 95 if you can buy it easily and want the best specification: more floor per level, 159cm of height, 13mm mesh, and the one feature nobody else offers — it splits into two independent cages, which solves introductions, quarantine and a sick animal that needs separating without buying a second enclosure.

The Critter Nation 161 only if you have already decided to buy the second unit later. On its own it is one tier at 65cm, which fails the two-tier consensus and most of the height band, and buying the single then upgrading costs more than buying the double at the start.

Neither of the one-inch cages, for a rat, at any price. Everything else about them is good, which is exactly what makes them dangerous to shop for. Rat cage bar spacing sets out how to measure a gap you are unsure about, and what to do about a cage you already own.