Aquarium Volume Calculator

Aquarium Length (inches):

Aquarium Width (inches):

Water Depth (inches):

Calculate

Aquarium Volume (gallons):

An aquarium volume calculator helps determine the total water capacity of a fish tank. Knowing the exact volume is essential for proper fish stocking, filtration, and water treatment.

Formula

The aquarium volume is calculated using the formula:

AV = (AL × AW × WD) / 231

Where:

• AV is the aquarium volume in gallons.
• AL is the aquarium length in inches.
• AW is the aquarium width in inches.
• WD is the water depth in inches.
• 231 is the conversion factor from cubic inches to gallons.

How to Use

1. Enter the length of the aquarium in inches.
2. Input the width of the aquarium in inches.
3. Enter the water depth in inches.
4. Click the Calculate button.
5. The total aquarium volume in gallons will be displayed.

Example

For an aquarium with:

• Length = 36 inches
• Width = 18 inches
• Water Depth = 20 inches

The volume calculation is:
AV = (36 × 18 × 20) / 231
AV = 55.84 gallons

FAQs

1. Why do I need to calculate aquarium volume?
   • It helps determine water treatment, stocking levels, and filtration needs.
2. Does the aquarium volume include decorations?
   • No, decorations and gravel reduce the actual water volume.
3. How do I measure water depth?
   • Measure from the bottom to the water surface, not the tank’s top.
4. What if my aquarium is not rectangular?
   • For cylindrical or irregular tanks, different formulas apply.
5. Why is 231 used in the formula?
   • 231 cubic inches equal one gallon of water.
6. Can I use this calculator for saltwater tanks?
   • Yes, but ensure additional volume for filtration and equipment.
7. How accurate is this calculator?
   • It provides a close estimate but may vary slightly due to tank shape.
8. Does glass thickness affect volume?
   • No, this formula measures internal water capacity.
9. Can I use centimeters instead of inches?
   • Convert centimeters to inches first, then use the calculator.
10. How does water displacement affect volume?

• Decorations, substrate, and equipment reduce actual water capacity.

11. What is the best tank size for beginners?

• A 20- to 55-gallon tank is ideal for most beginners.

12. How does aquarium shape affect volume?

• Bow-front or irregular shapes require different calculations.

13. Is the formula the same for reef aquariums?

• Yes, but you should also factor in sump volume.

14. Why does water evaporate from my tank?

• Evaporation happens due to heat; cover the tank to reduce it.

15. Do I need an exact volume for fish stocking?

• Yes, to ensure proper space and oxygen levels.

16. How do I account for filtration in volume calculations?

• Include sump or external filter volume separately.

17. Is more water volume better for fish health?

• Yes, larger volumes provide better stability and water quality.

18. Can I use this for ponds?

• No, ponds require a different formula considering depth and shape.

19. Does this calculator work for nano tanks?

• Yes, but small errors have a bigger impact in smaller tanks.

20. How do I increase my aquarium’s water capacity?

• Use external sumps or taller tanks for more volume.

Conclusion

The aquarium volume calculator is a valuable tool for fishkeepers, helping with tank setup, filtration selection, and stocking decisions. Accurate volume estimation ensures a healthier aquatic environment for fish and plants.