How Much Does a Hermit Crab Cost?
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Hermit crabs are often sold as an impulse buy at beach shops and boardwalk stands, which is exactly the wrong way to think about them. Done properly, they need a real setup, and they're social animals that shouldn't be kept alone.
The Crabs Themselves: $5 to $40 Each
Usually the smallest line item in the whole budget. Keep at least two, hermit crabs are social and don't do well in isolation, so budgeting for a single crab isn't really an option if you want to keep them properly.
Upfront Setup: $135 to $245
| Item | Cost Range |
|---|---|
| 20-gallon long tank for a pair (at least 10 gallons per crab; check the dimensions before you buy) | $35 - $60 |
| Substrate (sand and coconut fiber) | $10 - $30 |
| Digital thermometer and hygrometer | $10 - $20 |
| Extra shells, dishes, hides, dechlorinator, marine salt | $25 - $60 |
| Glass lid that seals humidity in (the link fits a 20 gallon long) | $25 - $30 |
| Side- or back-mounted heat mat with a thermostat | $25 - $40 |
| Cuttlebone as a calcium source | about $5 |
| Setup total | $135 - $245 |
Typical price ranges across retailers.
The table prices a pair in a 20-gallon long, before the crabs themselves. A bigger group needs a bigger tank, priced below.
Pricing a Tank for a Group
Plan on at least 10 gallons for each small to medium crab and 15 for each large one, so a pair starts at 20 gallons, three need 30 and four need 40. Bigger is better. A bare 20-gallon long runs about $60 and a 40-gallon breeder about $150 at full price, before a lid. The rest of the list scales with the floor: a larger tank takes proportionally more sand and coconut fiber to reach the same 6-inch depth, a longer heat mat, and more spare shells, since every crab needs several to choose from. Planning for the final group size at the start is cheaper than buying a small tank now and replacing it when the colony grows. That last line covers the extras that are easy to underestimate, including a pair of soakable water dishes, since hermit crabs need both a fresh water dish and a separate marine saltwater dish, not just one.
In the wild, hermit crabs looking to trade up will actually queue by size next to a vacant shell in what researchers call a vacancy chain, waiting their turn to try it on before the next crab in line gets a shot. It's part of why keeping several spare shells on hand, even in captivity, keeps a crab from settling for one that fits poorly.
Ongoing Costs: Roughly $10 to $30 a Month
Food and general supplies make up most of the monthly spend for hermit crabs. This is a genuinely low-cost pet to maintain once the initial setup is built, most of the expense is front-loaded into getting the tank right the first time.
Why "Cheap Boardwalk Crab" Is a Misleading Way to Think About Cost
The low individual price of a hermit crab, often just a few dollars, creates the impression that this is a low-investment pet overall. In reality, the setup, tank, substrate depth, humidity control, and multiple spare shells, is what determines whether a hermit crab thrives, and none of that is optional. Skipping that setup to save money is a common reason hermit crabs from boardwalk shops don't survive long, not because the species is inherently fragile, but because the cheap version of ownership isn't adequate care. Most hermit crab health problems trace straight back to that gap.
Hermit crabs can live 10 years or more when kept well, and some reach 30, which makes the upfront investment in a proper setup a reasonable one relative to how long you'll actually have the animal. That lifespan is one reason it sits beside the axolotl and the goldfish among pets that break the usual mold. The wild side of the species is in the Hermit Crab encyclopedia profile.
Sources & Further Reading
Last reviewed 21 Jul 2026 · 3 sources
Frequently Asked Questions
How much does a hermit crab itself cost?
Usually $5 to $40 per crab, the smallest line item in the budget. Budget for at least two: hermit crabs are social and don't do well kept alone, so a single crab isn't the way to keep them properly.
What does a proper hermit crab setup cost?
Plan on $135 to $245 for a pair's full setup before the crabs: tank and lid, substrate, a heat mat and thermostat, a thermometer and hygrometer, extra shells, dishes, dechlorinator, marine salt and cuttlebone. Tank size and how many crabs you're starting with are what move you around in that range.
What are the ongoing monthly costs for a hermit crab?
Around $10 to $30 a month, mostly food and general supplies. Upkeep is cheap once the tank is built, since most of the expense is front-loaded into getting that setup right the first time.
Why is 'cheap boardwalk crab' a misleading way to think about hermit crab cost?
Because the low price of the crab itself hides what determines whether it thrives: the tank, substrate depth, humidity control, and multiple spare shells. Skipping that real setup to save money is a common reason boardwalk-shop crabs don't survive long, and it doesn't change the fact that a well-kept hermit crab can live 10 years or more, and some reach 30.
More on the Hermit Crab
Hermit Crab care guide
🦀 How to Handle a Hermit Crab (Minimally, and On Its Terms)
🦀 Common Hermit Crab Health Issues (There's Almost No Vet Care, So Prevention Is Everything)
🦀 Hermit Crab Enclosure Setup: Humidity, Deep Substrate, and Extra Shells
🦀 Hermit Crab Feeding: Scatter It, Vary It, and Watch the Label
🕷️ 10 Surprising Hermit Crab Facts
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Written by Michael Ryan
Mike has kept three hermit crabs for about five years, each one passed along by his niece and nephews.
Mike keeps two rescued bearded dragons, Dex and Cera, and writes the care guides on BeastlyFacts from his own research and mistakes. He is not a veterinarian.
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