How do you calculate the volume of a 3D shape?

Volume measures 3D space occupied by an object. For a rectangular box, V = length × width × height. For a cylinder, V = π × radius² × height. For a sphere, V = (4/3) × π × radius³.

What is the SI unit for volume?

The official SI unit of volume is the cubic meter (m³). Commonly used metric sub-units include the liter (1,000 L = 1 m³) and cubic centimeter (cm³).

How do you calculate liquid volume in a horizontal cylindrical tank?

Use the circular segment formula: V = [r² arccos((r-d)/r) - (r-d)√(2rd - d²)] × L, where r is radius, d is liquid depth, and L is tank length.

Quick & Easy Volume Calculator

Online Volume Calculator

Quickly calculate the volume of boxes, cylinders, spheres, cubes, and cones. Enter your measurements and get immediate answers in gallons, liters, cubic feet, and meters.

Rectangular Box

Calculates the volume of boxes, shipping packages, rooms, and rectangular containers.

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Need Tanks, Pipes, Pyramids, or Specialized Shapes?

Explore our complete directory of all 16 dedicated 3D tools with instant step-by-step arithmetic.

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Shipping & Moving Boxes

Multiply Length × Width × Height in inches, then divide by 1,728 to find cubic feet for freight and moving trucks.

Pools & Water Tanks

For round pools, calculate the cylinder volume and multiply cubic feet by 7.48 to get the exact water capacity in US gallons.

Kitchen & Recipes

Convert between cups, pints, quarts, fluid ounces, and milliliters effortlessly without mental math mistakes.

Everyday Volume Questions

Quick answers to common household, shipping, and tank calculations

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How do I calculate the volume of a package or cardboard box?▼

Measure the length, width, and height of the box using a tape measure. Select Rectangular Box on our calculator above, enter the three dimensions in inches, and you will instantly get the volume in cubic feet, cubic inches, and liters.

How many gallons are in a cubic foot of water?▼

There are exactly 7.48052 US liquid gallons in one cubic foot (ft³) of water. To convert cubic feet to gallons, simply multiply by 7.48.

What if my container is a cylinder, sphere, or cone?▼

Use the tabs at the top of the calculator to pick Cylinder, Sphere, or Cone. For more specialized shapes (like horizontal tanks with liquid fill depth, capsules, pipes, and pyramids), open our All 16 Calculators Hub.