How Much Two Mongolian Gerbils Cost, With a Smart Budget

The short answer

A Mongolian gerbil usually costs about $5–20 each, per Omlet’s US guide, but the tank, deep bedding and food cost far more than the animals. Fat-tailed gerbils run about $20–40, and this guide covers Mongolian gerbils only. Gerbils are social, so budget for two; can gerbils live alone explains why.

Which cost to jump to

Pricing a first pair? Start with the tank in section 2. Already bought a small one? Section 7 is for you. Check the law first: Hawaii prohibits private gerbil ownership and California restricts gerbils under its permit rules.

🩺 Health Note: This is general cost information, not a substitute for an exam by a vet experienced with gerbils. If a gerbil is injured, bleeding or struggling to breathe, call a vet experienced with gerbils now rather than waiting to see if it settles. If you don’t have an exotics vet yet, find one before you need one.

One-time costs: the tank and 20–30 cm of bedding

Sources disagree on tank size for a Mongolian gerbil pair, so each figure carries its source.

Three tank figures, and what a 40-gallon costs

Merck says about 10 gallons for two, as a rule of thumb. The RSPCA gives no floor figure but wants a tank about 50 cm high, and the Irish rescue GSPCA asks for at least 100 × 50 cm, about 40 gallons. Deal-site posts list a 40-gallon breeder (648 sq in) at $99.99–$139.99 regular and $44.99–$69.99 on sale; they are undated, so check today’s price.

Our gerbil tank setup for a pair and tank size for a pair guides compare every figure. A mesh lid costs extra, and we found no verified price for this size.

How many litres 20–30 cm of bedding takes

The RSPCA recommends 20–30 cm of bedding; Merck says about one-third of the tank’s depth.

Litres are our arithmetic (4,180 cm² floor × depth), not a measured pour, priced from a 60-litre paper-bedding bag at $19.39 on Chewy on 14 Oct 2026.

🔄 Outdated Advice: Several US care sheets say 2–6 inches of bedding; the RSPCA recommends 20–30 cm.

The rest of the setup: nest box, hides and wheel

These smaller items follow the RSPCA’s housing guidance for a Mongolian gerbil pair.

Nest box and hides

The RSPCA asks for one dark nest box, plus hiding places numbering one more than the gerbils: three for a pair. Cardboard tubes and boxes are RSPCA-named nesting and enrichment items, so they cost little.

A solid, axle-free wheel

The RSPCA lists a wheel as optional, and Merck warns that slatted wheels can catch feet or tails. We did not price one, because no listing we found confirmed both a solid surface and no axle.

Sand bath, and what you can skip

Merck says gerbils need sand bathing. A chinchilla dust that lists gerbils was $11.15 on Chewy on 14 Oct 2026, container extra. Skip slatted wheels and fluffy nesting.

Monthly costs: bedding, food, hay and chews

Costs for a Mongolian gerbil pair depend on what you replace and how often, and no source gives a standard rate.

The monthly log, line by line

*Assumes one full fill replaced every two months: our illustration, not a sourced rate. Prices are listings in US dollars, not receipts.

That puts bedding and pellets near $18–26 a month; sources split on paper versus wood, as best gerbil bedding explains.

What 5 g of pellets a day adds up to

Merck’s gerbil home guide says 5 g of pellets a day and its professional page says 5–8 g, so a pair eats roughly 300–480 g a month (our arithmetic). Check the label’s protein against Merck’s 18–20% and avoid seed mixes; best gerbil food covers fat.

Three to four years, added up

The RSPCA says three to four years, some longer; Merck’s professional page says two to three. Lifetime cost is setup plus 24–48 months of running costs plus vet bills.

🔄 Outdated Advice: One cost guide says gerbils don’t use water. Merck says an adult drinks about 4 mL a day, with fresh water supplied daily.

Vet costs: what to budget for and who to ask

🚨 Vet Now: Tail skin that has come off, bleeding, a stuck or limp leg, or hard breathing needs a vet experienced with gerbils now. Don’t use this section to decide.

This section covers visits for a Mongolian gerbil, and the unplanned ones cost the most.

What a gerbil vet visit can cost

Exotics clinics set their own fees, and we could not verify a gerbil exam fee. Use AEMV’s vet finder, then ask whether the clinic sees gerbils, what the exam fee is, and whether there is an after-hours fee.

Setting money aside

Chewy’s gerbil care sheet and the Yarmouth Vet Center’s both recommend an annual exam, so budget one visit a year plus a reserve sized from your clinic’s quote.

Where to save money without cutting corners

These savings suit a Mongolian gerbil pair because the RSPCA and Merck both name them.

Free items the RSPCA and Merck name

RSPCA-named nesting items include ink-free cardboard or paper, empty toilet rolls, egg containers and plain boxes; Merck adds plain shredded facial tissue. Merck also calls an ordinary fish tank with a mesh lid an excellent home, so a used one can trim the biggest cost.

Where not to cut

Don’t skimp on floor space, height or a solid wheel surface. Never use cotton wool or fluffy strands for nesting: the RSPCA calls them a serious welfare risk, and Merck says commercial nesting strands can tangle small feet.

Already bought a small tank? The cheapest fix

This is common for a Mongolian gerbil pair: the GSPCA says most pet shop cages and kits are far too small, so you are not alone.

Measure first, for free

Measure the tank’s internal floor and height, then subtract your bedding depth from the height. The RSPCA puts an adult gerbil at about 12 cm tall and wants room for it to stand.

Fix depth before floor

If headroom allows, deeper bedding costs only bedding, and the RSPCA suggests a gerbilarium with added depth for gerbils that dig repetitively in one corner. Depth doesn’t add floor space, so move to a larger tank with a mesh lid when you can.

Quick answers about gerbil costs

Your next step: start a receipt log today

Price the tank first, since it is the biggest one-time cost. Then write down every purchase with its date and store for your first month; your own receipts will beat any range in this guide, including ours.