Weight Converter

Free online weight converter — convert kg to lb, g to oz, stones to pounds. Interactive comparison chart shows your value in all supported weight units at once.

Convert weight units

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About This Calculator

The Weight Converter lets you instantly convert between seven weight units: milligrams (mg), grams (g), kilograms (kg), metric tons (tonne), ounces (oz), pounds (lb), and stones (st). Whether you are cooking with international recipes, shipping packages across borders, tracking fitness goals, or working on engineering projects, this tool provides fast and accurate conversions between metric and imperial weight systems.

The converter uses kilograms (kg) as its base unit for all calculations. Each source unit is first converted to kilograms using a precise, internationally accepted conversion factor, then divided by the target unit's factor to produce the final result. For example, 1 kilogram equals 2.20462 pounds, 35.274 ounces, 0.157473 stones, 1,000 grams, and 0.001 metric tons. The comparison chart and breakdown table display your value in all seven units at once, making it easy to see every equivalent side by side.

Regional Notes

India (IN): The metric system is the official standard. Body weight is measured in kilograms, grocery items in grams and kilograms, and industrial goods in metric tons. Pounds and ounces are rarely used except in some imported product packaging.

United States (US): Pounds (lb) and ounces (oz) are the primary units for everyday weight — body weight, food packaging, and postal shipping. Kilograms are understood but less commonly used in daily life, though the scientific and medical fields use metric.

United Kingdom (UK): A mixed system is in use. Body weight is commonly quoted in stones and pounds (e.g., 11 st 4 lb), while kilograms appear on medical records and gym equipment. Food packaging typically shows both metric (g/kg) and imperial (lb/oz). Metric tons are standard for industry.

Frequently Asked Questions

How does the Weight Converter work?

Enter a numeric value, select the source unit and target unit from the dropdown menus, and click Convert. The tool uses kilograms as the base unit: it converts your input to kilograms using precise standard factors, then divides by the target unit's factor to produce the result. The comparison chart updates automatically to show your value across all seven supported units.

How many weight units are supported?

The converter supports seven weight units: milligrams (mg), grams (g), kilograms (kg), metric tons (tonne), ounces (oz), pounds (lb), and stones (st). The comparison chart and breakdown table display your value in every unit simultaneously so you can compare all equivalents at a glance.

Is the conversion accurate?

Yes. All conversion factors follow internationally accepted standards from the International System of Units (SI) and the international avoirdupois system. Kilograms are the base SI unit for mass, and every other unit is converted using its legally defined equivalence relative to the kilogram.

How do I convert kilograms to pounds manually?

To convert kilograms to pounds manually, multiply the kilogram value by 2.20462. For example, 70 kg × 2.20462 = 154.32 lb. To convert pounds back to kilograms, divide the pound value by 2.20462. Our converter handles both directions instantly.

What is the difference between a metric ton and a US ton?

A metric ton (tonne) equals 1,000 kilograms or approximately 2,204.62 pounds. A US short ton equals 2,000 pounds (907.18 kg), while a UK long ton equals 2,240 pounds (1,016 kg). This converter uses the metric ton (1,000 kg), which is the standard tonne unit worldwide.

Why is stone used as a weight unit?

The stone (14 lb) is primarily used in the United Kingdom and Ireland for measuring body weight. People commonly say "I weigh 11 stone" rather than 154 pounds or 70 kilograms. The unit dates back to medieval times when actual stones were used as counterweights on balances.

Which countries use pounds and which use kilograms?

The metric system (kg, g, tonne) is the official standard in every country except the United States, Liberia, and Myanmar. The US primarily uses pounds and ounces for everyday weight. The UK uses both kilograms and stones for body weight, and pounds for many other measurements. Canada officially uses metric, but many older generations still reference imperial units.

Can I convert between any two weight units?

Yes. You can convert from any of the seven supported units to any other. Select the source unit in the From dropdown and the target unit in the To dropdown, enter a value, and click Convert. The result shows the equivalent value in your target unit, while the chart and table show all unit equivalents.