Weight and Mass Converter

Enter the mass value you want to convert.

Select the source unit.

Choose the target unit.

View the converted result and the equivalent values in other supported units.

Adjust the number of decimal places to control how the results are displayed.

Copy the result or an equivalent value for use elsewhere.

Use the swap control to reverse the source and target units. The converter updates the calculation using the new unit selection.

Convert mass measurements between metric and customary units with this online weight and mass converter. Enter a value, select the units, and see the converted result alongside equivalent values in the other supported units.

Use it to convert kilograms to pounds, grams to ounces, milligrams to micrograms, or metric tonnes to kilograms. You can also swap units, adjust decimal precision, and copy individual results.

Mass and weight are related, but they do not mean exactly the same thing.

Mass describes how much matter an object contains. It does not change when the object moves from Earth to the Moon or another location. Mass is commonly measured in kilograms, grams, pounds, and ounces.

Weight is the force of gravity acting on an object's mass. It can change depending on the strength of the gravitational field. Weight as a force is measured in newtons (N), not kilograms or pounds.

In everyday conversation, people often use the word "weight" when they mean mass. For example, someone might say that a package weighs 5 kilograms. More precisely, 5 kilograms describes the package's mass.

This converter changes mass measurements between units. It does not calculate gravitational force or convert mass into newtons.

The converter includes eight units from the metric and customary measurement systems.

Metric units

Kilogram (kg): The standard SI unit of mass. Commonly used for body mass, luggage, products, and many everyday measurements.

Gram (g): One-thousandth of a kilogram, often used for food, ingredients, and smaller objects.

Milligram (mg): One-thousandth of a gram, used for very small quantities.

Microgram (µg): One-millionth of a gram, used for extremely small masses.

Metric tonne (t): Equal to 1,000 kilograms. Often used for vehicles, materials, cargo, and large quantities.

Customary units

Pound (lb): Commonly used to express body mass and the mass of products in the United States and other regions.

Ounce (oz): One-sixteenth of a pound, used for smaller quantities of food and other items.

Stone (st): A unit equal to 14 pounds, traditionally used for body mass in the United Kingdom and Ireland.

The following examples use standard metric and customary mass definitions.

A few practical examples:

5 kg to pounds: Approximately 11.0231 lb.

500 g to ounces: Approximately 17.6370 oz.

150 lb to kilograms: Approximately 68.0389 kg.

10 stone to kilograms: Approximately 63.5029 kg.

2 metric tonnes to kilograms: 2,000 kg.

The displayed values may be rounded according to your selected precision.

Mass conversions are useful in everyday activities, shopping, cooking, shipping, and technical work.

Travel and luggage: Compare baggage limits listed in kilograms and pounds.

Cooking: Convert ingredient quantities between grams and ounces.

Shopping: Understand product weights when sellers use different measurement systems.

Shipping and logistics: Convert package, cargo, and material masses between kilograms, pounds, and metric tonnes.

Fitness: Compare body mass measurements expressed in kilograms, pounds, or stone.

Education and science: Work with metric and customary mass units in calculations.

The precision setting controls how many decimal places appear in the converted result and equivalent values. Fewer decimal places make results easier to read, while more decimal places can be useful for detailed calculations.

The converter uses the selected precision for display. It should retain full conversion accuracy internally and round only the values shown on screen.