What is the formula for the volume of a cylinder?

The volume of a cylinder is calculated using the formula V = π × r² × h, where r is the radius of the circular base and h is the height of the cylinder. π (pi) is approximately 3.14159. Square the radius, multiply by pi, then multiply by the height.

How do I calculate cylinder volume in US gallons?

Calculate the volume in cubic inches using V = π × r² × h with measurements in inches, then divide by 231 (since 1 US gallon equals exactly 231 cubic inches). If measurements are in feet, calculate cubic feet and multiply by 7.48052 to get US gallons.

How do I find cylinder volume if I only have the diameter?

Divide the diameter by 2 to get the radius, then use the formula V = π × r² × h. For example, if the diameter is 10 inches, the radius is 5 inches. Our calculator has a Diameter/Radius toggle so you can enter the diameter directly.

What is the actual volume of a standard 55-gallon drum?

A standard US 55-gallon drum has an inside diameter of approximately 22.5 inches and an inside height of about 34.5 inches. Using the cylinder volume formula, this yields approximately 13,717 cubic inches or about 59.4 US gallons of total capacity. The name 55-gallon is a nominal rating.

How many gallons fit in a cylindrical tank?

Measure the internal diameter and height in inches. Calculate: Gallons = π × (diameter/2)² × height ÷ 231. For feet: Gallons = π × (diameter/2)² × height × 7.48052. Always use internal dimensions since wall thickness affects actual capacity.

What is the difference between US gallons and Imperial gallons?

A US gallon equals 231 cubic inches (3.785 liters), while an Imperial gallon (UK) equals 277.42 cubic inches (4.546 liters). An Imperial gallon is approximately 20% larger than a US gallon. This calculator uses US gallons throughout.

✓ Verified Accurate | Reviewed by Engineering Experts | Updated: January 2025

Volume Formula Cylinder Calculator (USA)

Calculate the volume of any cylinder instantly in US gallons, cubic feet, and cubic inches. Built specifically for US users with standard American units — ideal for water tanks, oil drums, pipes, concrete columns, and industrial storage containers. Includes step-by-step solutions, pre-loaded common US sizes, and a visual cylinder diagram.

⚡ Quick Select — Common US Sizes

Diameter (across the circle)

Please enter a positive number greater than zero.

Height (top to bottom)

Please enter a positive number greater than zero.

Unit of Measurement

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US Gallons

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Cubic Inches

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Cubic Feet

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Liters

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Cubic Meters

Step-by-Step Solution

Cylinder Diagram

V = π × r² × h

V = Volume | π ≈ 3.14159 | r = Radius | h = Height

💡 US Quick Conversions

1 US Gallon = 231 cubic inches (exact)

1 Cubic Foot = 7.48052 US gallons

1 Cubic Foot = 1,728 cubic inches

1 US Gallon = 3.78541 liters

1 US Gallon = 0.133681 cubic feet

US Unit Conversion Reference Table

Convert From	Convert To	Operation
Cubic Inches	US Gallons	÷ 231
Cubic Inches	Cubic Feet	÷ 1,728
Cubic Feet	US Gallons	× 7.48052
Cubic Feet	Cubic Inches	× 1,728
US Gallons	Cubic Inches	× 231
US Gallons	Liters	× 3.78541
Liters	US Gallons	× 0.264172
Cubic Meters	US Gallons	× 264.172
Cubic Meters	Cubic Feet	× 35.3147

Common Cylinder Volumes (US Standard Sizes)

Click any item to auto-calculate its volume.

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Volume Formula Cylinder Calculator (USA)

Step-by-Step Solution

Cylinder Diagram

💡 US Quick Conversions

US Unit Conversion Reference Table

Common Cylinder Volumes (US Standard Sizes)

Alsyed Construction

Office Hours

Contact Info

Volume Formula Cylinder Calculator (USA)

Step-by-Step Solution

Cylinder Diagram

💡 US Quick Conversions

US Unit Conversion Reference Table

Common Cylinder Volumes (US Standard Sizes)

Alsyed Construction

Office Hours

Contact Info

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