Weight Unit Converter

Enter a value and select a starting unit to see all available conversion results.

Weight Units and Descriptions

Below are descriptions and historical context for each Weight unit available in this converter.

Milligram (mg)

One milligram, commonly used in medicine for drug dosages and precision measurements.

Gram (g)

The gram was defined in 1795 as the mass of one cubic centimeter of water at 4°C.

Carat (ct)

The carat represents the weight of a gemstone, where 1 carat is 200 milligrams.

Kilogram (kg)

The kilogram is the SI base unit of mass. Originally defined by a platinum-iridium cylinder in Paris.

Ounce (oz)

Ounce derives from Roman 'uncia' (twelfth part). Avoirdupois ounce standardized in 1959.

Pound (lb)

Pound comes from Latin 'libra pondo' (pound weight). Standardized as exactly 453.592 grams in 1959.

Stone (st)

Historical British unit, still used in UK for body weight measurements. A Stone equals 14 pounds.

Metric Tonne (t (Metric))

A metric ton is a unit of mass equal to 1,000 kilograms, or about 2,204.6 pounds. Also known as a 'tonne', it is the standard unit for mass in the metric system and is used worldwide in science, engineering, and international commerce to distinguish it from the imperial (long) ton and the US (short) ton.

Imperial Ton (t (Imperial))

An Imperial ton, also known as a long ton or British ton, is a unit of mass equal to 2,240 pounds or approximately 1,016 kilograms.

US Ton (t (US))

A US ton, also known as a short ton, is a unit of weight equal to 2,000 pounds (approximately 907.18 kilograms).

Base Unit Conversion Factors

The table below shows the conversion factors from each unit to the base unit, which is the Gram (g).

  • 1 Gram (g) = 1000 Milligram (mg)
  • 1 Gram (g) = 1 Gram (g)
  • 1 Gram (g) = 5 Carat (ct)
  • 1 Gram (g) = 0.001 Kilogram (kg)
  • 1 Gram (g) = 0.03527399072294 Ounce (oz)
  • 1 Gram (g) = 0.0022046244201838 Pound (lb)
  • 1 Gram (g) = 0.00015747312327469 Stone (st)
  • 1 Gram (g) = 1.0E-6 Metric Tonne (t (Metric))
  • 1 Gram (g) = 9.8420643926905E-7 Imperial Ton (t (Imperial))
  • 1 Gram (g) = 1.102310995001E-6 US Ton (t (US))