Gerbils are burrowers first and climbers second. In the wild they dig deep tunnel systems, and a shallow cage denies them their main natural behaviour. That is why gerbil housing is judged by floor area and bedding depth, not by height. This free calculator gives the minimum tank floor area and bedding depth for your gerbil count.
What this tool does
This free gerbil cage size calculator – tank size and bedding depth runs entirely in your browser. Nothing you type is sent to a server, and nothing is stored online. You enter a few simple facts about your gerbils, press the button, and the result appears at once. You can change any value and run it again as often as you like. That makes it easy to test what happens when weight, count, or age changes, and to prepare good questions for your vet.
How to use it
Start with the facts you know for sure. Weigh your gerbils if you can, because a guessed weight makes the whole result less useful. Then pick the options that match your gerbils best, such as age group or count. Press the calculate button and read the result lines one by one. If a value looks surprising, check the inputs first: a wrong unit or a wrong age group is the most common cause of a strange result.
Reading your result
The first line is minimum floor area in square metres, and the second line is the same area in square centimetres, which matches how tanks are sold. The third line is bedding depth in centimetres. Depth is not decoration: gerbils need at least 20 cm to dig stable tunnels. A tank with a huge floor but 5 cm of bedding still fails the gerbil test.
Worked example
Take 2 gerbils. The calculator gives a minimum floor area of 0.5 square metres, which is 5000 square centimetres, with 20 cm of bedding. A 100 by 50 cm tank hits that floor area exactly. Groups of more than 2 gerbils get 25 cm of bedding in the result, because bigger groups dig more and need deeper, more stable tunnels.
Practical tips
Use a glass tank or a deep-base cage, not a barred cage with a shallow tray, because bedding will end up on your floor. Mix bedding types, such as wood shavings with hay and paper, so tunnels hold their shape. Add a solid wheel, a sand bath, and cardboard tunnels, and never use a wire wheel, which can injure feet and tails. Spot-clean daily and keep one corner of old bedding at each change so the tank still smells familiar.
When to ask your vet
Book a vet visit if a gerbil stops burrowing, sits hunched, or develops a swollen nose or tail. A sudden behaviour change in a burrowing animal often signals illness or stress. Tell the vet about cage size and bedding depth, because housing is often part of the picture.
Common questions
Is this veterinary advice? No. This tool gives educational estimates for healthy pet gerbils. It does not diagnose illness, and it does not replace a vet, especially for sick animals or animals on medication.
How accurate is the result? It is a good starting point for most gerbils, but real needs vary with breed, body shape, weather, and daily routine. Use the result for two to four weeks, watch the trend, and then fine-tune.
What if my gerbil is very active one day and lazy the next? Feed and plan for the average week, not for a single day. Active days can take a small extra, and rest days can take a slightly smaller amount, as long as the weekly total stays near the target.
Spanish version: Tamaño de jaula para jerbos – Superficie y madrigueras