Weight Converter
Convert Kilograms, Pounds, Ounces, Stones, Tons, Grains, Carats, Atomic Mass Units, Slugs, and Quintals
Free online weight converter for metric and imperial units. Instantly convert between all major mass units with accuracy and ease.
What is a Weight Converter?
A weight converter is a tool that allows you to quickly and accurately convert between different units of mass, such as kilograms, pounds, ounces, stones, tons, grains, carats, atomic mass units, slugs, and quintals. This is essential for science, cooking, engineering, and everyday life when working with different measurement systems.
Supported Weight & Mass Units
- Kilogram (kg): The base unit of mass in the International System of Units (SI). Used worldwide for most scientific and everyday measurements.
- Gram (g): 1/1000 of a kilogram. Commonly used for small quantities in cooking, science, and retail.
- Milligram (mg): 1/1,000,000 of a kilogram. Used for very small masses, such as in medicine and chemistry.
- Microgram (µg): 1/1,000,000,000 of a kilogram. Used for trace amounts, especially in pharmacology and science.
- Pound (lb): The primary unit of mass in the US customary and British imperial systems. 1 pound = 0.45359237 kg.
- Ounce (oz): 1/16 of a pound. Used for small weights in the US and UK, especially in food and postal services.
- Stone (st): Equal to 14 pounds. Used in the UK and Ireland for measuring body weight.
- Tonne (t): Also called metric ton. Equal to 1,000 kilograms. Used for large masses, especially in industry and shipping.
- US Ton (short ton): Equal to 2,000 pounds (907.185 kg). Used mainly in the United States.
- UK Ton (long ton): Equal to 2,240 pounds (1,016.047 kg). Used mainly in the United Kingdom.
- Grain (gr): An old unit, equal to 1/7000 of a pound (64.79891 mg). Used in measuring bullets, arrows, and some pharmaceuticals.
- Carat (ct): Used for gemstones and pearls. 1 carat = 0.2 grams.
- Atomic Mass Unit (u or amu): Used in atomic and molecular physics. 1 u ≈ 1.66053906660 × 10⁻²⁷ kg.
- Slug: A unit of mass in the US customary system, mainly used in physics and engineering. 1 slug = 14.5939 kg.
- Quintal (q): Metric unit equal to 100 kilograms. Used in agriculture and trade, especially in Europe and India.
How to Use the Weight Converter
- Enter the value you want to convert.
- Select the unit you are converting from.
- View instant conversions to all other supported units below.
Why Use ManyCalcs Weight Converter?
- Completely free and ad-free.
- Supports all major metric and imperial weight units.
- Instant, accurate, and easy-to-use interface.
- Mobile-friendly and accessible on any device.
- Educational content for every unit.
Frequently Asked Questions
- How do I convert kilograms to pounds?
- Enter the value in kilograms, select "Kilogram (kg)", and view the result in pounds in the output list.
- What is the difference between a US ton and a UK ton?
- A US ton (short ton) is 2,000 pounds (907.185 kg), while a UK ton (long ton) is 2,240 pounds (1,016.047 kg).
- What is a carat used for?
- Carat is used for measuring gemstones and pearls. 1 carat = 0.2 grams.
- What is an atomic mass unit?
- An atomic mass unit (u or amu) is used in atomic and molecular physics. 1 u ≈ 1.66053906660 × 10⁻²⁷ kg.
- Is this weight converter free?
- Yes, the ManyCalcs weight converter is 100% free and always will be.
Related Converters
For more information, see Units of mass on Wikipedia.