This calculator applies standard geometric formulas for five shapes: cube (V = s³), rectangular prism (V = l × w × h), sphere (V = 4/3 × π × r³), cylinder (V = π × r² × h), and cone (V = 1/3 × π × r² × h). Surface area formulas vary by shape but follow the same mathematical principles taught in geometry. All calculations assume regular shapes with the dimensions you provide.
One gallon equals 231 cubic inches. So if your volume is in cubic inches, divide by 231 to get gallons. For example, 462 in³ ÷ 231 = 2 gallons.
This calculator covers the most common 3D shapes. For irregular or composite shapes, you may need specialized tools or need to break the shape into smaller geometric pieces and sum their volumes.
The formula is exact for ideal mathematical cones with a circular base and a single apex point. Real-world cones may have slightly different volumes due to manufacturing tolerances, but the calculator provides a close estimate.
Volume is the space inside an object; capacity is how much that object can hold (often slightly less due to wall thickness). For a theoretical hollow container, they're equivalent. For physical containers, capacity is usually smaller.
No — this calculator only works for regular geometric shapes. Irregular shapes require advanced methods like displacement (water or sand) or 3D scanning software.
Possible reasons: rounding errors in your measurements, misalignment of dimensions (e.g., measuring a slanted edge instead of the true height), or the real object not being a perfect shape.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.