Mass Calculator

What Is a Mass Calculator?

A mass calculator converts a numerical mass measurement from one unit to another. This free online tool supports common metric and imperial units, allowing you to convert measurements such as kilograms, grams, milligrams, tonnes, pounds, ounces and stones without performing manual calculations.

Mass conversions are useful for cooking, science, education, manufacturing, shipping, engineering, fitness, product specifications and everyday measurements where different measurement systems are used.

Why Use the Mass Calculator?

The calculator provides a straightforward way to convert mass between commonly used metric and imperial units while also displaying a complete conversion table for the entered measurement.

How to Use the Mass Calculator

Converting a mass measurement takes only a few seconds. Enter the measurement and select the units you want to convert between.

1. Enter the mass — Type the numerical mass you want to convert into the Mass field.
2. Choose the starting unit — Select the unit of your original measurement from the From menu.
3. Choose the target unit — Select the unit you want the mass converted into from the To menu.
4. Read the result — The converted mass and a full conversion table are displayed automatically.

Convert Mass Between Metric and Imperial Units

Mass measurements are commonly expressed using metric, imperial or US customary units. The metric system uses units such as milligrams, grams, kilograms and tonnes, while imperial and US customary measurements commonly include ounces, pounds and stones. Converting between these systems makes measurements easier to compare when information is supplied using different units.

For example, kilograms and grams are widely used for everyday mass measurements and scientific work, while pounds and ounces are frequently used in the United Kingdom and United States. The Mass Calculator handles conversions between these units without requiring you to remember individual conversion formulas.

Common Mass Conversions

Common conversions include kilograms to pounds, pounds to kilograms, grams to ounces, ounces to grams, kilograms to stones, stones to kilograms and tonnes to pounds. Enter the original measurement and select the appropriate units to calculate the conversion.

Metric, Imperial and US Customary Mass Units

Metric mass units are based on the gram and use decimal relationships. For example, one kilogram contains 1,000 grams and one tonne contains 1,000 kilograms. Imperial and US customary units use different relationships. One avoirdupois pound contains 16 ounces, while one UK stone contains 14 pounds. The calculator applies these relationships automatically.

Mass Conversion Accuracy

The calculator uses standard conversion factors based on internationally defined metric relationships and the international avoirdupois pound. For example, one pound is exactly 0.45359237 kilograms, one ounce is exactly 28.349523125 grams and one stone is exactly 6.35029318 kilograms.

Although mass and weight have different technical meanings in physics, everyday language often uses the word weight when referring to a measurement in kilograms or pounds. This calculator is intended for unit conversion and does not calculate gravitational force or weight in newtons.

Frequently Asked Questions