Cylinder Aquarium Volume Calculator

Determine the water volume of cylindrical or column fish tanks. Calculate gallons from diameter and height.

1Tank Dimensions

Diameter (inch)

Height (inch)

2Adjustments

Filled Percentage90%

Most tanks are not filled to the brim, and gravel/decor takes up space. 85-90% is a safe estimate.

Estimated Water Volume

15.86US Gal

Metric Volume

60 Liters

UK Volume

13.21 UK Gal

Total Weight (Approx)

~132.3 lbs / ~60 kg

Recommended Heater

75 Watts

Based on ~4-5 watts per gallon

Filter Flow Rate

63-95 GPH

Target 4-6x turnover per hour

Calculating Cylinder Tank Volume

Cylindrical or "Column" tanks are stunning centerpieces but present unique challenges for filtration and stocking due to their small surface area relative to volume.

The Math Behind the Circle

To find the volume, we use the formula for a cylinder: V = π · r² · h. Our tool simplifies this—just measure the **Diameter** (total width across the center) and **Height**.

Stocking Considerations

Remember that cylinder tanks have less surface area for gas exchange compared to rectangular tanks of the same volume. It is often recommended to understock these tanks or ensure vigorous aeration to maintain high oxygen levels for your fish.

Why "Gallon" matters?

Many medications and water conditioners are dosed by US Gallons. Knowing your exact water volume prevents overdosing. Remember that substrate (gravel/sand) can reduce actual water volume by 10-20%.

Stocking Guide

A common rule of thumb is "1 inch of fish per gallon", but this is outdated. Surface area (Length × Width) is often more important for oxygen exchange than total volume.

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Frequently Asked Questions

How do I calculate volume for a round tank?

Measure the diameter (width across the center) and the height. The formula involves Pi × Radius² × Height.

Cylinder Aquarium Volume Calculator

1Tank Dimensions

2Adjustments

Estimated Water Volume

Recommended Heater

Filter Flow Rate

Calculating Cylinder Tank Volume

The Math Behind the Circle

Stocking Considerations

Why "Gallon" matters?

Stocking Guide

Frequently Asked Questions

How do I calculate volume for a round tank?

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Cube Aquarium Volume Calculator

Cylinder Aquarium Volume Calculator

1Tank Dimensions

2Adjustments

Estimated Water Volume

Recommended Heater

Filter Flow Rate

Calculating Cylinder Tank Volume

The Math Behind the Circle

Stocking Considerations

Why "Gallon" matters?

Stocking Guide