Tank sizes
Standard Fish Tank Sizes Compared
Dimensions and weights for the common glass aquarium sizes, with the heater and substrate each one needs. Pick a size for a full setup list and stocking ideas.
| Size | Dimensions (L × W × H) | Weight when full | Heater for 78°F | Substrate |
|---|---|---|---|---|
| 5 gallon | 16 × 8 × 10 in | ~62 lbs | 25 W | 12 lbs |
| 10 gallon | 20 × 10 × 12 in | ~111 lbs | 50 W | 18 lbs |
| 20 gallon | 24 × 12 × 16 in | ~225 lbs | 100 W | 25 lbs |
| 29 gallon | 30 × 12 × 18 in | ~330 lbs | 150 W | 35 lbs |
| 40 gallon | 36 × 18 × 16 in | ~458 lbs | 150 W | 60 lbs |
| 55 gallon | 48 × 13 × 21 in | ~625 lbs | 200 W | 55 lbs |
| 75 gallon | 48 × 18 × 21 in | ~850 lbs | 250 W | 75 lbs |
Heater sizes assume a 68°F room. Dimensions are the usual figures for standard glass tanks and vary a little by maker.