RightSizeTools Practical sizing calculators
Geometry Basics

Cylinder Volume Calculator

Use this for round tanks, tubes, posts, barrels, sonotubes, and other cylinder-shaped spaces or objects.

Last updated: May 2026

Unit system Switch between U.S. customary and metric units. Your choice is remembered on other calculators.

Cylinder measurements

Radius is half the diameter. Height is the length/depth of the cylinder.

Visual guide

Which measurement goes where?

Radius is half the diameter across the round face. Height (or length) is measured along the cylinder.

ft
ft

Buying and sizing notes

How to use this estimate

What this includes

  • The required inputs shown on this page
  • common planning assumptions
  • optional advanced adjustments where provided

What it does not include

  • site-specific professional design
  • local code approval
  • manufacturer-specific requirements
  • installation quality

Common mistakes

  • Leaving a required input at the default when your situation is different
  • ignoring product labels or ratings
  • treating the estimate as an exact final answer

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