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Enter the unbroken floor length and width of the cage in inches, plus the bedding depth in inches. The calculator gives the unbroken floor area in square inches, square cm and square feet, and the bedding volume in litres. Measure only the main floor level: shelves, tubes and levels do not count toward unbroken floor space. Compare your result with the species minimums table below: a cage can pass a US minimum and still fall short of the UK welfare benchmark, so check both. These are planning estimates, not veterinary advice.
Floor area = cage length × cage width, measured on the single unbroken floor level. Floor area in sq cm = sq in × 6.4516, and floor area in sq ft = sq in / 144, so one measurement serves both US and UK unit systems. Bedding volume = floor area × bedding depth × 0.0163871 litres per cubic inch, which tells you how much substrate a deep burrowing setup actually needs.
Worked example: a 36 in by 18 in cage has 648 sq in of floor, which is 4180.64 sq cm or 4.5 sq ft. At 10 in of bedding depth it holds 106.19 litres of bedding. A 30 in by 12 in cage has 360 sq in (2322.58 sq cm, 2.5 sq ft) and at 6 in of bedding holds 35.4 litres. Hamster cage size in square inches is the figure most US guides quote, while hamster cage size in cm suits UK guides: this page gives both from one measurement.
Measure the inside length and width of the main floor level only, in inches, ignoring shelves, platforms and tubes. Enter those two numbers and your planned bedding depth. Press Calculate and read the floor area first: compare it with the minimums table below for your species and for the standard you want to meet. Then read the bedding volume, which is the practical number for buying substrate: deep bedding setups use far more bags than the shallow layer most starter cages ship with. If your cage fails the standard you care about, no accessory compensates: floor area is the figure that matters.
Standards disagree, so this table shows them side by side instead of pretending one number fits all. US-oriented guides quote 360 sq in minimum for dwarf hamsters and 450 sq in for Syrian hamsters. UK welfare sources (Blue Cross, PDSA, Woodgreen) recommend about 100 × 50 cm, which is about 775 sq in, for all species. Vet-recommended figures run higher: about 900 sq in for a Syrian hamster cage size and about 700 sq in for dwarf hamster cage size. A 100 × 50 cm hamster cage in inches is about 39.4 by 19.7 inches. A 40 gallon breeder hamster cage, about 36 by 18 inches, gives 648 sq in: above the US minimums, below the UK benchmark. Roborovski hamster cage size and Chinese hamster cage size follow the dwarf figures, but Roborovskis still need the same unbroken floor, not a smaller cage, despite their tiny bodies.
What bar spacing is safe for dwarf hamsters? Sources differ, so use the tighter figure when in doubt: about 0.25 inches (around 7 mm) for small dwarfs, up to 0.375 inches for larger dwarfs, and up to 0.5 inches for Syrians. Some vet sources give 0.5 inches as the ceiling for Syrians and 0.333 inches for all other hamsters. Bar spacing matters as much as floor area: a cage with perfect dimensions and wide bars is an escape and injury risk for a dwarf. Tank-style cages with a mesh lid avoid bar spacing entirely, which is one reason they suit dwarf species well.
How deep should hamster bedding be? UK welfare guidance says at least 20 cm, with a deeper burrowing zone of 25 to 30 cm, while US vet guidance says about 12 inches for Syrians and 6 to 8 inches for dwarfs. Shallow bedding of 2 to 4 inches, still quoted by some older guides, does not allow burrowing and should be treated as outdated. How big should a hamster wheel be? About 28 to 32 cm for Syrians, 25 to 27 cm for Chinese, 22 to 25 cm for Campbell's and Winter White dwarfs, and 20 to 22 cm for Roborovskis. A wheel that is too small bends the hamster's back, and a cage tall enough for deep bedding plus an upright wheel is part of the size calculation, not an extra.
Are glass tanks good hamster cages? Yes, with a secure mesh lid: tanks hold deep bedding, contain scatter, and are escape-proof for dwarfs, but they are heavy and need a large mesh top for ventilation. Barred cages ventilate well and are light, but most have shallow bases that defeat deep bedding, and bedding falls through the bars. A bin cage size for hamster keepers is usually a large storage bin converted with a mesh lid: cheap, deep, and light, with floor areas of 800 sq in or more possible, but it needs careful ventilation work. Tube cages and multi-level cages look fun but fail the unbroken floor test: levels do not add floor space, and narrow tubes stress hamsters. Can I use a fish tank as a hamster cage? Yes, with a mesh lid: is a 20 gallon tank big enough for a hamster? A 20 gallon long tank is about 360 sq in, which meets the US dwarf minimum only. Is a 75 gallon tank big enough for a hamster? At about 864 sq in it passes the UK benchmark as well.
Signs a cage is too small include persistent bar chewing, restless pacing, repeated escape attempts, overgrooming and irregular sleep. Common mistakes are choosing by hamster body size instead of floor area, counting shelves as floor area, thin bedding, a starter-cage wheel, a wire floor, narrow tube systems, and heavy objects sitting on loose bedding where they can fall on a burrowing hamster. Best cage size for dwarf hamster keepers is not the smallest cage that fits the animal: dwarfs are active and need the same 100 × 50 cm benchmark UK sources recommend. Hamster cage size for two hamsters is a separate question: Syrian hamsters must live alone, and even dwarf pairs need far more than a single-hamster cage, with a spare cage ready if they fight.
It depends on the standard: US guides quote 360 sq in for dwarfs and 450 sq in for Syrians, UK welfare sources recommend about 100 × 50 cm (about 775 sq in) for all species, and vet sources recommend about 900 sq in for Syrians and 700 sq in for dwarfs. This calculator gives your cage area so you can check it against each standard.
A Syrian hamster cage size of at least 450 sq in meets the US minimum, about 775 sq in meets the UK welfare benchmark, and about 900 sq in meets the vet-recommended figure. Syrians must live alone, so the cage is for one hamster only.
A dwarf hamster cage size of at least 360 sq in meets the US minimum, and about 775 sq in meets the UK welfare benchmark. Dwarfs are small but very active, so the UK benchmark is the better target even for Roborovskis.
Use about 0.25 inches (around 7 mm) for small dwarfs to be safe, up to 0.375 inches for larger dwarfs, and up to 0.5 inches for Syrians. Sources disagree, so the tighter figure is the safe choice for any dwarf.
Aim for at least 20 cm across much of the cage with a deeper zone of 25 to 30 cm for burrowing, or about 12 inches for Syrians and 6 to 8 inches for dwarfs on US vet guidance. Shallow bedding of a few inches does not allow natural burrowing.
Yes, with a secure mesh lid: tanks hold deep bedding, contain scatter, and suit dwarfs because there are no bars to escape through. They are heavy and need a large mesh top for ventilation, so they suit a permanent spot rather than frequent moving.
Not as a substitute for floor area: levels do not count toward unbroken floor space, and hamsters need one large flat level for running and burrowing. Low, gentle levels can add enrichment to a cage that already meets the floor minimum, but they never rescue a small cage.
Syrian hamsters must live alone and will fight. Some dwarf species can live in pairs or groups, but only in a cage well above the single-hamster minimum, with multiple hides, wheels and feeding spots, and a spare cage ready to separate them if fighting starts.
Yes, with a secure mesh lid for ventilation and escape prevention. A 20 gallon long tank (about 360 sq in) only meets the US dwarf minimum, while a 40 gallon breeder (about 576 sq in) or a 75 gallon tank (about 864 sq in) gives far more room. Never use cedar or pine shavings as bedding.
Syrians need about 28 to 32 cm, Chinese about 25 to 27 cm, Campbell's and Winter White dwarfs about 22 to 25 cm, and Roborovskis about 20 to 22 cm. The wheel must let the hamster run with a straight back, and the cage must be tall enough for the wheel standing on deep bedding.