10 gallon fish tank: dimensions, weight & setup
A standard 10 gallon tank measures 20 × 10 × 12 inches, holds about 9.1 gallons of real water and weighs roughly 100 lb once set up. It is a great size for a betta community, a small school of nano fish, or a first tank.
10 Gallon tank dimensions
| Inches | Centimeters | |
|---|---|---|
| Length | 20 in | 50.8 cm |
| Width (front to back) | 10 in | 25.4 cm |
| Height | 12 in | 30.5 cm |
| Footprint | 200 in² (1.4 ft²) | 1,290 cm² |
| Typical glass | 1/8 in | 3 mm |
These are typical outside dimensions for US glass tanks; brands vary slightly, so measure yours before buying a stand, lid or background.
How much water does it really hold?
| US gallons | Liters | |
|---|---|---|
| Outside dimensions | 10.4 | 39.3 |
| Filled 1 in below the rim | 9.1 | 34.3 |
| With 2 in of gravel | 7.4 | 28.0 |
Dose medication and fertilizer for the real water — about 7 gallons once the tank is aquascaped, not 10.
How much does a 10 gallon tank weigh?
| Empty (estimated, 1/8 in glass) | 11 lb | 5 kg |
|---|---|---|
| Filled with fresh water | 87 lb | 39 kg |
| Set up, fresh water + 2 in gravel | 100 lb | 45 kg |
| Set up as saltwater | 102 lb | 46 kg |
| Floor load under the stand | 72 lb/ft² | 3.5 kPa |
Add rock, decor and the stand (often 40–120 lb). A floor load of 72 lb/ft² is 1.8× the 40 lb/ft² a typical home floor is designed for when averaged over a room, so place the stand across the joists and near a load-bearing wall. Use the weight calculator to include your own rock and stand.
Heater size
| Room temperature (water at 78 °F) | Heater |
|---|---|
| 73 °F (5 °F lift) | 25 W |
| 68 °F (10 °F lift) | 50 W |
| 63 °F (15 °F lift) | 50 W |
Colder room, nano heater or dual-heater setup? See the 10 gallon heater size chart.
Plan maintenance with the water change schedule: a 30% change on this tank is about 2.2 gallons.
Filter flow
| Tank type | Real flow | Filter rating |
|---|---|---|
| Community tropical | 36–54 GPH | 52–78 GPH |
| Planted tank | 45–73 GPH | 65–104 GPH |
| Goldfish, cichlids or heavy feeders | 73–91 GPH | 104–130 GPH |
Substrate
| Depth | Gravel | Sand |
|---|---|---|
| 1 in (2.5 cm) | 11 lb | 11 lb |
| 2 in (5.1 cm) | 22 lb | 22 lb |
| 3 in (7.6 cm) | 33 lb | 32 lb |
Stocking ideas
- 1 betta + 6 pygmy corydoras + 1 nerite snail
- 8 ember tetras + 6 pygmy corydoras + 3 amano shrimp
- 3 male guppies (no females, to avoid a population boom) + cherry shrimp
Check any combination — including temperature and group size — in the stocking calculator.
Setup tips
- The 20-inch length is short for active swimmers — zebra danios and most tetras are happier in a 20 long.
- Cycle the tank for 4–6 weeks before adding fish; small tanks have little margin for ammonia spikes.
- Most 10-gallon kits include a 20-inch hood: check the light can grow plants before buying them.
FAQ
What are the dimensions of a 10 gallon fish tank?
A standard 10 gallon glass tank measures 20 × 10 × 12 inches (50.8 × 25.4 × 30.5 cm) on the outside, a footprint of 1.4 square feet. Brands differ by up to about half an inch.
How much does a 10 gallon fish tank weigh?
About 10 lb empty, 85 lb filled with water and roughly 100 lb set up with 2 inches of gravel, before rock, decor and the stand.
How many gallons does a 10 gallon tank really hold?
10.4 gallons by its outside dimensions, about 9.1 gallons (34 liters) filled an inch below the rim, and about 7.4 gallons with 2 inches of gravel.
What size heater does a 10 gallon tank need?
50 W to hold 78 °F in a 68 °F room; 25 W in a 73 °F room and 50 W in a 63 °F room.
How much gravel or sand for a 10 gallon tank?
About 11 lb of gravel per inch of depth: 22 lb for a 2-inch bed, or 22 lb of sand.
What filter flow does a 10 gallon tank need?
36–54 GPH of real flow for a community tank (4–6× turnover), so choose a filter rated about 52–78 GPH.