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Enter the number of rabbits and the run space you want per rabbit in square feet. The calculator multiplies them to give the total run area, the fencing length for a square run of that area, and a suggested length and width for a 2 to 1 rectangular run. The default of 32 sq ft per rabbit matches the older 8x4 rabbit run standard (8 ft by 4 ft). These are planning estimates based on published welfare guidance, not veterinary advice, and a run never replaces daily free roam time.
Every rabbit run calculation starts from one allowance: run space per rabbit. Run area = rabbits × run space per rabbit. If you build the run as a square, fencing length = 4 × sqrt(run area), because each side of a square is the square root of its area. This page also shows a 2 to 1 rectangle, which suits rabbits better than a square because rabbits run in straight lines and need a long sprint line. Suggested length = sqrt(run area × 2) and suggested width = sqrt(run area / 2).
Worked example: 2 rabbits at 32 sq ft each need 64 sq ft of run. A square run needs 32 ft of fencing, and a 2 to 1 rectangle measures about 11.31 ft by 5.66 ft. For 4 rabbits at the same allowance the run is 128 sq ft, with 46 ft of square fencing and a rectangle of 16 ft by 8 ft.
First count the rabbits that will share the run. Bonded pairs and groups share space, but every rabbit still needs its own allowance, so enter the full group size. Then pick run space per rabbit: 32 sq ft is the widely quoted older minimum exercise space, while the current Rabbit Welfare Association and Fund (RWAF) guidance asks for a larger permanently available area (see the section on why sources differ). Press Calculate and read the run area first, then the fencing length, then the suggested run length and width. Adjust the allowance up for large breeds and down only if your rabbits also get several hours of daily free roam time outside the run.
Small rabbits under 4 lb, such as Netherland Dwarfs, manage on the smaller end of the range, but dwarf rabbit run size should still allow full sprints, so do not drop below about 24 sq ft per rabbit. Medium rabbits of 4 to 9 lb are the reference case for the 32 sq ft allowance. Large rabbits of 9 to 15 lb need more sprint room, so plan on 40 sq ft or more per rabbit. Giant breeds over 15 lb, including the Flemish Giant, need the most room: a Flemish Giant run size of 50 sq ft or more per rabbit is a sensible planning figure, with a taller run to match their height. The table below summarises planning allowances in square feet per rabbit: dwarf 24 to 32, medium 32, large 40, giant 50.
A hutch is the enclosed sleeping quarters, a run is the attached exercise area, and a pen is an enclosed area that can include both. The classic 6x2 hutch with run combination pairs a 6 ft by 2 ft sleeping box with an 8 ft by 4 ft run. The run size in this calculator is only the exercise area: it does not include the hutch footprint. Treat this page as a rabbit run dimensions guide and as a companion to any rabbit cage size calculator: the same formula sizes an outdoor rabbit run size and, with a smaller allowance for supervised play, an indoor rabbit pen size. The current RWAF minimum for two average rabbits is a single enclosed area of at least 3 m by 2 m by 1 m high, available at all times, with sleeping quarters of at least 1.8 m by 0.6 m by 0.6 m inside or attached to it. Upper floors, platforms and tunnels do not count toward that footprint, because rabbits need flat ground to run on.
Rabbit run size for 2 rabbits at the default allowance is 64 sq ft, for example an 8x4 rabbit run of 8 ft by 4 ft. Rabbit run size for 4 rabbits is 128 sq ft, for example 16 ft by 8 ft. Each additional rabbit adds one full allowance: there is no shared-space discount for runs, because rabbits that cannot move apart will squabble. One rabbit kept alone still needs the same minimum as a pair, since the minimum is set by the need to sprint, hop and stand upright, not by body count alone. If you keep a bonded group, size the run for the largest group that will ever use it at once.
Rabbit run height matters: rabbits stand upright and jump, so a run should be at least 2 ft high for small and medium rabbits and about 3 ft for large breeds, matching the older hutch height guidance. A predator proof rabbit run needs a roof or strong mesh top, mesh no wider than the gaps a stoat or rat can pass, and buried wire or a mesh skirt to make it dig proof, since rabbits dig out and foxes dig in. Site the run on grass where possible, add a shaded corner and a hide, and link it permanently to the hutch so rabbits can move between shelter and exercise at will. A permanently attached rabbit run beats a run that is only offered for an hour a day.
Published figures differ because standards changed. Older guidance quoted a 6 ft by 2 ft hutch plus an 8 ft by 4 ft run, 32 sq ft of exercise space, while current RWAF guidance asks for a 3 m by 2 m area available at all times. Some guides quote a 2.5 sq m (27 sq ft) run, others 32 sq ft, and some quote a pen of 2.75 sq m (30 sq ft) including sleeping space. This calculator does not hide the disagreement: it lets you enter any allowance, defaults to the familiar 32 sq ft exercise figure, and the sections above explain the larger current standard so you can plan above the minimum if you have the space.
For exercise, the older widely quoted minimum is 32 sq ft of run per rabbit group share, often shown as an 8 ft by 4 ft run. Current RWAF guidance asks for a larger permanently available area of 3 m by 2 m for two average rabbits. This calculator lets you plan with either figure by changing the space per rabbit.
Multiply rabbits by run space per rabbit. Two rabbits at 32 sq ft each need a 64 sq ft run, for example 11.31 ft by 5.66 ft as a 2 to 1 rectangle or 8 ft by 8 ft as a square. Larger breeds and rabbits with little free roam time need more.
At the default 32 sq ft per rabbit, a run for two rabbits is 64 sq ft. At the current RWAF standard the enclosed area for two rabbits is 3 m by 2 m (about 64.6 sq ft) available at all times, with sleeping quarters inside or attached.
Dwarf rabbits need slightly less floor area than large breeds, but they still need room to sprint and stand upright. Plan on at least 24 sq ft of run per dwarf rabbit, and do not treat a small body as a reason for a tiny run.
A 4 ft by 2 ft hutch alone is not enough for a rabbit: it is only 8 sq ft, below even the older 12 sq ft living-space minimum for one rabbit. A hutch of that size only works if it is permanently attached to a run of at least 32 sq ft that the rabbit can reach at all times.
RWAF recommends sleeping quarters of at least 1.8 m by 0.6 m by 0.6 m (6 ft by 2 ft by 2 ft) within a larger permanently available area. Older RSPCA-linked guidance quoted a 6 ft by 2 ft hutch plus an 8 ft by 4 ft run as the minimum combination.
No. Rabbits kept in a hutch full time without a run develop sore hocks, obesity and boredom behaviours. They need daily access to a run and, ideally, free roam time outside it. A run should be attached permanently, not offered as a rare treat.
Rabbits need space to sprint, hop and play every day, ideally for several hours. An exercise run of 24 to 32 sq ft per rabbit, plus free roam time when you can supervise, covers the daily need. A run that is only a few square feet cannot provide real exercise no matter how long the rabbit stays in it.
Plan on at least 2 ft of height for small and medium rabbits and about 3 ft for large and giant breeds, so rabbits can stand upright and jump safely. The run also needs a roof or mesh top for predator protection.
A run is essential, but supervised free roam time in a larger safe space is still valuable, especially for single rabbits and rabbits in smaller runs. Think of the run as the daily minimum and free roam as the bonus, not the other way round.