Volume Calculator

Calculate volume and surface area for cubes, boxes, cylinders, spheres, and cones.

By Konstantin Iakovlev · Updated April 2026 · Source: Khan Academy

Shape
ft
ft
ft

Volume

200.00 ft³

Surface Area

220.00 ft²

Volume Conversions

Cubic Feet200.00 ft³
Cubic Inches345,600.00 in³
Gallons (US)1,496.10 gal
Liters5,663.36 L
Surface Area220.00 ft²

Use the Volume Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Five everyday 3D shapes—cubes, boxes (rectangular prisms), cylinders, spheres, and cones—are covered here, with both volume and surface area computed for each. Anyone estimating materials in manufacturing or construction, or simply sizing up a home project, can get the numbers they need to plan accurately against 2026's range of demands.

Each shape draws on its own standard geometric formula. A cylinder's volume, for example, is π * r² * h and its surface area is 2πr(r + h), while a sphere's volume works out to (4/3)πr³ with a surface area of 4πr². Supply the relevant dimensions and the matching formula does the rest.

Unit consistency is where most errors start: mixing centimeters with meters throws off every result, so settle on one unit before you begin. It also pays to be clear about what 'surface area' means for your task, since the figure may describe the total surface or only the lateral surface depending on the application you have in mind.

Example: Calculating the volume and surface area of a new 2026 cylindrical water tank

  1. 1 Input the shape as 'Cylinder'. For the tank, a radius of 1.5 meters and a height of 3 meters are provided.
  2. 2 The calculator uses the formula V = π * (1.5m)² * 3m for volume and SA = 2π(1.5m)(1.5m + 3m) for surface area.
  3. 3 The calculated volume is approximately 21.21 cubic meters and the total surface area is approximately 42.41 square meters.
  4. 4 This means the 2026 water tank can hold 21,210 liters of water (since 1 cubic meter = 1000 liters) and requires 42.41 square meters of material for its construction, crucial for procurement and installation planning.

Source: Khan Academy · Last updated: April 2026

Frequently Asked Questions

How do you calculate the volume of a cylinder?
Volume of a cylinder equals pi times radius squared times height. A cylinder with a 3-foot radius and 5-foot height has a volume of 3.14159 times 9 times 5 = 141.37 cubic feet.
How many gallons are in a cubic foot?
One cubic foot equals 7.481 gallons. To convert cubic feet to gallons, multiply by 7.481. For example, a 10 cubic foot tank holds about 74.8 gallons.
How do you calculate cubic yards for concrete?
Calculate volume in cubic feet (length times width times depth in feet), then divide by 27 to convert to cubic yards. A 10x12 foot patio at 4 inches thick is 10 x 12 x 0.333 = 40 cubic feet or 1.48 cubic yards.

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