Weight Converter
Convert between metric and US/imperial units of weight and mass, from micrograms to tons. Conversions between kilograms, pounds, ounces, stones and tons are exact by definition.
Convert kilograms
Convert pounds
Convert grams
Convert ounces
Convert stone
Convert milligrams
Convert metric tons
Convert US tons
Convert micrograms
Convert imperial tons
Weight units
- Kilogram (kg)
- The kilogram is the SI base unit of mass, defined since 2019 by fixing the value of the Planck constant. It is the standard unit of mass in science and in everyday use in most countries.
- Pound (lb)
- The international avoirdupois pound is exactly 0.45359237 kilograms and is divided into 16 ounces. It is the everyday unit of weight in the United States and is still widely used in the United Kingdom.
- Gram (g)
- A gram is one thousandth of a kilogram. It is the usual unit for food portions, recipe ingredients and other small quantities in countries that use the metric system.
- Ounce (oz)
- The avoirdupois ounce is one sixteenth of a pound, exactly 28.349523125 grams. It is used for food, postal items and other light goods in the United States.
- Stone (st)
- A stone is 14 pounds, exactly 6.35029318 kilograms. It is used mainly in the United Kingdom and Ireland for body weight.
- Milligram (mg)
- A milligram is one thousandth of a gram, or one millionth of a kilogram. It is the usual unit for medicine doses and for nutrients listed on food labels.
- Metric ton (t)
- A metric ton, also called a tonne, is exactly 1,000 kilograms. It is the standard large unit of mass in international trade, shipping and industry.
- US ton
- The US ton, also called the short ton, is 2,000 pounds, exactly 907.18474 kilograms. It is the ton used in everyday and commercial contexts in the United States.
- Microgram (µg)
- A microgram is one millionth of a gram, or one thousandth of a milligram. It is used for very small doses of medicines and vitamins, where it is often written mcg.
- Imperial ton (long ton)
- The imperial ton, also called the long ton, is 2,240 pounds, exactly 1,016.0469088 kilograms. It was the standard ton in the United Kingdom before metrication and is still used for some ship measurements.
- Carat (ct)
- The metric carat is exactly 200 milligrams. It is used to weigh diamonds, other gemstones and pearls.
- Troy ounce (oz t)
- The troy ounce is 480 grains, exactly 31.1034768 grams. It is the unit in which gold, silver, platinum and other precious metals are priced and traded.
- Grain (gr)
- A grain is exactly 64.79891 milligrams, one seven-thousandth of an avoirdupois pound. It is used for bullets, gunpowder and arrows.