The volume charts below provide a rough guide to the volume of water held in rectangular aquariums.
Metric Volume Table
| Width (cm) | 20 | 25 | 30 | 38 | 45 | |||||||
| Depth (cm) | 20 | 25 | 30 | 38 | 45 | 30 | 38 | 45 | 30 | 38 | 45 | 60 |
| Length (cm) |
Volume (Litres) |
|||||||||||
| 30 | 10 | 15 | 23 | 29 | 35 | 29 | 37 | 44 | 35 | 44 | 53 | 70 |
| 38 | 12 | 19 | 27 | 34 | 41 | 34 | 43 | 53 | 41 | 52 | 62 | 83 |
| 45 | 15 | 24 | 35 | 44 | 53 | 44 | 56 | 67 | 53 | 67 | 80 | 107 |
| 60 | 20 | 33 | 47 | 59 | 71 | 59 | 74 | 89 | 71 | 89 | 107 | 143 |
| 90 | 30 | 49 | 71 | 89 | 107 | 89 | 112 | 134 | 107 | 134 | 161 | 215 |
| 120 | 40 | 65 | 95 | 119 | 143 | 119 | 149 | 179 | 143 | 179 | 215 | 287 |
Imperial Volume Table
| Width (in) | 8 | 10 | 12 | 15 | 18 | |||||||
| Depth (in) | 8 | 10 | 12 | 15 | 18 | 12 | 15 | 18 | 12 | 15 | 18 | 24 |
| Length (in) |
Volume (Gallons) |
|||||||||||
| 12 | 2 | 4 | 5 | 6 | 8 | 6 | 8 | 10 | 8 | 10 | 12 | 16 |
| 15 | 3 | 4 | 6 | 7 | 9 | 7 | 9 | 12 | 9 | 12 | 14 | 18 |
| 18 | 4 | 5 | 8 | 10 | 12 | 10 | 12 | 15 | 12 | 15 | 18 | 24 |
| 24 | 5 | 7 | 10 | 13 | 16 | 13 | 16 | 20 | 16 | 20 | 24 | 31 |
| 36 | 7 | 11 | 16 | 20 | 24 | 20 | 25 | 30 | 24 | 30 | 35 | 47 |
| 48 | 9 | 15 | 21 | 26 | 32 | 26 | 33 | 39 | 32 | 39 | 47 | 63 |
