Size to Weight Calculator

Choose the shape and unit system, enter the dimensions shown, and provide the material density. Metric dimensions use centimeters and density uses kg/m³. Imperial dimensions use inches and density uses lb/in³. Confirm these units before copying a value from a supplier’s data sheet.

​

HOW MASS IS ESTIMATED

​

The calculation uses mass = volume × density. A larger object or a denser material produces a larger result. Although commonly called weight, results in kilograms or pounds describe a mass estimate rather than the force exerted by gravity.

​

WORKED EXAMPLE

​

A solid block measuring 10 cm × 10 cm × 10 cm has volume 1,000 cm³, or 0.001 m³. At a density of 1,000 kg/m³, its estimated mass is 1 kg. At 2,700 kg/m³, the same volume has estimated mass 2.7 kg. The density values here are illustrative; use a value for your specific material.

​

CHOOSING A DENSITY

​

Density depends on the material’s grade, moisture, temperature, and structure. A bulk material such as loose gravel includes air gaps, so use bulk density when estimating a pile or container. A solid-material density can overestimate that load. Avoid entering kg/m³ into an imperial density field.

​

HOLLOW AND IRREGULAR OBJECTS

​

Outer dimensions alone describe the enclosing volume. For a hollow object, calculate the outside volume and subtract the empty inside volume before applying density. For a mixed-material object, estimate each material separately and add the masses.

​

Treat the result as an estimate for planning, then compare it with manufacturer specifications or a scale. Packaging, fittings, absorbed moisture, and dimensional tolerances can change the real mass. Do not use this estimate alone to establish safe lifting, structural, or vehicle load limits.