About This Tool
Need to know how much water fits in a tank? How many liters a pipe holds? The volume of a barrel or a can? This calculator gives you the answer in seconds β in every unit you need.
Enter the diameter (or radius) and height of any cylinder, and get the volume in liters, gallons, cubic meters, cubic feet, and cubic inches. For pipes and tubes, switch to hollow mode and enter the wall thickness to calculate the internal volume β the part that actually holds liquid.
Whether you're sizing a water tank, estimating fuel in a barrel, figuring out how much concrete fills a sonotube, or checking if a pot is big enough β this is the tool that does the math.
How to Use
1. Choose a preset (pipe, barrel, water tank, etc.) or enter custom dimensions
2. Enter diameter and height in your preferred unit (mm, cm, m, in, ft)
3. For hollow cylinders (pipes), toggle "Hollow" and enter wall thickness
4. Read the volume in multiple units β liters, gallons, cubic meters, cubic feet
5. Use "Fill level" to calculate partial volumes (tank half full, etc.)
6. Click "Copy Link" to share your calculation
Formula
V = Ο Γ rΒ² Γ h
Where:
r = radius (diameter Γ· 2)
h = height (or length for horizontal cylinders)
Hollow cylinder:
V = Ο Γ (RΒ² β rΒ²) Γ h
R = outer radius, r = inner radius
Unit conversions:
1 mΒ³ = 1,000 liters = 264.172 US gallons
1 ftΒ³ = 28.3168 liters = 7.481 US gallons