90 gallon tank: size, liters and setup numbers
The 90 gallon shares the 75's footprint but is 24 inches tall. The extra height adds volume and room for tall plants and fish like angelfish, though reaching the bottom takes a long arm.
| Typical dimensions | 48 × 18 × 24 in 121.9 × 45.7 × 61 cm |
|---|---|
| Volume | 90 US gallons 340.7 liters |
| Realistic water after substrate and decor | About 76.5 gal About 289.6 L |
| Water weight | About 751 lb About 341 kg |
| Gravel for a 1 inch bed | About 50 lb About 23 kg |
| Gravel for a 2 inch bed | About 100 lb About 45 kg |
| Heater (room 8°F / 4.4°C cooler) | 2 × 150 W |
| Heater (room 15°F / 8.3°C cooler) | 2 × 250 W |
| Filter flow (4 to 6 times per hour) | 360 to 540 GPH 1,363 to 2,044 L/h |
Dimensions vary a little between brands. For exact numbers, measure your tank and use the calculators below.
Plan the rest of your 90 gallon tank
Common questions
- How many liters is a 90 gallon tank?
- A 90 gallon tank holds about 340.7 liters when filled to the brim. With substrate and decorations, the real water volume is usually closer to 290 liters.
- How much does a 90 gallon tank weigh when full?
- The water alone weighs about 751 pounds (341 kg). Glass, substrate and rock add more on top, so choose a stand rated for the full weight.
- What size heater does a 90 gallon tank need?
- If your room stays around 8°F below your target water temperature, a 2 × 150 W heater is a good fit. For colder rooms, around 15°F below target, go with 2 × 250 W.