Cylinder Volume Gallons

Calculate cylinder volume in US gallons from radius and height using V = pir^2h. Supports inches, feet, cm, and meters with instant unit conversion for tanks and containers.

Calculate cylinder volume in gallons

About This Calculator

This Cylinder Volume Gallons Calculator helps you quickly convert cylinder measurements into US gallons and cubic units. Simply enter the radius and height of your cylinder, select the measurement unit, and get the volume instantly.

The calculator uses the formula V = pir^2h to compute the cubic volume. It then applies the appropriate conversion factor based on your selected unit to display the result in US liquid gallons. A breakdown chart shows the relationship between base area and height.

How the conversion works:

  • Inches (in^3 -> US gal): Divide by 231 (1 US gallon = 231 cubic inches)
  • Feet (ft^3 -> US gal): Multiply by 7.48052 (1 ft^3 = 7.48052 US gallons)
  • Centimeters (cm^3 -> US gal): Divide by 3785.41
  • Meters (m^3 -> US gal): Multiply by 264.172

This calculator is ideal for water tanks, fuel storage, aquarium volume, pool capacity, and any cylindrical container where gallon capacity is needed.

Frequently Asked Questions

How do you calculate cylinder volume in gallons?

First calculate the volume in cubic units using V = pir^2h, then convert to gallons. For inches, divide by 231 (1 US gal = 231 in^3). For feet, multiply by 7.48052 (1 ft^3 = 7.48052 US gal). For meters, multiply by 264.172. For cm, divide by 3785.41.

How many gallons are in a cubic foot?

There are 7.48052 US gallons in one cubic foot. To convert cubic feet to gallons, multiply the volume in cubic feet by 7.48052. For example, a 2 ft^3 container holds approximately 14.96 gallons.

How many gallons are in a cubic inch?

There are 0.004329 US gallons in one cubic inch, or equivalently 1 US gallon = 231 cubic inches. To convert cubic inches to gallons, divide the volume by 231. This is the standard conversion used in the US.

How do I find the volume of a cylinder in gallons for a water tank?

Measure the radius and height of the tank in the same unit (preferably inches or feet for US gallons). Calculate V = pir^2h to get cubic volume, then convert using the appropriate factor. For a 2 ft radius, 5 ft tall tank: V = pi x 4 x 5 = 62.83 ft^3 x 7.48052 = 470 gallons.

What is the difference between US gallons and Imperial gallons?

A US gallon equals 231 cubic inches or approximately 3.785 liters. An Imperial gallon (UK) equals 277.42 cubic inches or approximately 4.546 liters. Imperial gallons are about 20% larger than US gallons. This calculator uses US gallons.

Can I calculate the volume of a horizontal cylinder tank in gallons?

This calculator computes full cylinder volume. For partially filled horizontal tanks, the formula involves calculating the segment area of the circle and multiplying by the length. For a quick estimate, this full-volume calculator gives the maximum capacity, which you can then multiply by the fill percentage.

Is this tool free to use?

Yes, all calculators on Calculy are completely free to use with no registration required. You can also share your calculation results via URL.