Mass Calculator

What this calculator does

The Mass Calculator finds the mass of an object or quantity from its density and volume. It accepts density and volume in a wide range of metric, US customary, and UK customary units, converts both to SI base units, multiplies them, and displays the result in your chosen mass unit. A supplementary table repeats the same mass in other common units.

Mass is the amount of matter in an object and stays the same on Earth or the Moon. Weight is the gravitational force on that mass and changes with local gravity. This page calculates mass only. For weight in newtons, use the Weight Calculator.

How to use this calculator

1. Enter the density and select its unit.
2. Enter the volume and select its unit.
3. Choose the mass unit in which the result should appear.
4. Click Calculate.

The default example uses a density of 8,900 kg/m³ and a volume of 1 cubic meter. The result is 8,900 kilograms. The table then shows the same mass as 8,900,000 grams, 8.9 metric tons, about 19,621 pounds, and in other units.

Formulas

Mass is density multiplied by volume:

m = ρ × V

Here m is mass, ρ is density, and V is volume. The engine converts the density to kilograms per cubic meter and the volume to cubic meters before multiplying:

mass in kg = (density × density factor) × (volume × volume factor)

The result is then divided by the factor for the selected output mass unit. For example, because 1 pound equals 0.45359237 kilograms, a mass in kilograms is divided by 0.45359237 to express it in pounds.

What the results mean

The headline result is the mass in the unit you selected. The summary rows show density and volume in SI units, which makes it easy to check the inputs. The equivalent mass table lists the same mass in every supported unit, including kilograms, grams, milligrams, metric tons, pounds, ounces, carats, atomic mass units, grains, quarters, and stones.

A large mass does not always mean a large object. A small, dense object such as a lead weight can have more mass than a much larger foam object.

Assumptions and limitations

• Density is assumed to be uniform. Real objects may have voids, layers, moisture, or mixed materials.
• Density depends on temperature and pressure. The calculator does not adjust for those conditions.
• The metric ton is 1,000 kilograms, the pound is 0.45359237 kilograms, and the carat is 0.2 grams.
• The atomic mass unit is included for scientific contexts; it is far too small for everyday objects.
• Negative density and volume are rejected. Zero density or volume is allowed and produces zero mass.
• The calculator does not compute weight, buoyancy, center of mass, or gravitational force.
• Results are rounded. The equivalent table may differ slightly from a hand calculation because each row uses the full-precision mass in kilograms.

Frequently asked questions

How do I find mass from density and volume?

Multiply density by volume. For example, a volume of 2 cubic meters with a density of 500 kg/m³ has a mass of 1,000 kilograms. Make sure the units are consistent or convert them first.

What is the difference between mass and weight?

Mass measures the amount of matter and is independent of gravity. Weight measures the gravitational force on that mass and equals mass times the local gravitational acceleration. A 70-kilogram person has the same mass on the Moon but much less weight there.

Why does the result show 8.9 tons for 8,900 kilograms?

The calculator uses the metric ton, which is exactly 1,000 kilograms. Some countries use a short ton of 2,000 pounds or a long ton of 2,240 pounds; those units are not used in this table.

Reference table

Mass unit examples

The mass calculator converts between metric, US customary, and selected scientific units using fixed factors.

Source

Reference: Calculator.net — Mass Calculator. Unit definitions and SI relationships can be verified with NIST reference materials.

Disclaimer

This calculator provides a mathematical estimate from the density and volume you enter. Actual mass may differ because of material variation, temperature, moisture, and measurement uncertainty.