# Mass conversion: unit selection

The conversion calculator converts to and from carats, grams, hectograms, kilograms, milligrams, ounces, pounds as well as other less commonly used units (see below). Select what you want to convert from and what you want to convert to. Then press the "Conversion calculator" button.

### Mass conversion calculator

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Mass is the measure of the amount of matter in an object. In everyday use weight is synonym of mass.
Units of mass supported by the converter:

UnitSymbolDescription
attogramagMetric system. One Quintillionth of a gram.
attotonneatOne quintillionth of a tonne.
caratCDThe carat is used to measure gems and pearls. One carat is equal to 200 mg.
centalcwtCental is another name for short hundredweight. One cental is equal to 100 pounds avoirdupois.
centigramcgA hundredth of a gram in the metric system
centitonnectOne hundredth of a tonne
decagramdagMetric system. One decagram is 10 grams
decatonnedatOne decatonne is 10 tonnes
decigramdgA tenth of a gram in the metric system.
decitonnedtOne tenth of a tonne.
exagramEgOne exagram in the metric system is equal to one quadrillion (1000000000000000) kilograms.
exatonneEtOne exatonne is equal to one quintillion (1000000000000000000) tonnes.
femtogramfgMetric system. One quadrillionth of a gram.
gigagramGgMetric system. One gigagram is equal to one million kilograms.
gigatonneGtOne gigatonne is equal to one billion (1000000000) tonnes.
graingrOne grain is equal to 64.79891 mg.
gramgA gram, in the metric system, is equal to one thousandth of a kilogram.
gross tonL/TGross ton is another name for the long ton. It has been replaced by the metric ton for most uses.
hectogramhgMetric system. One hectogram is 100 grams.
hectotonnehtOne hectotonne is 100 tonnes.
hundredweight (long)cwtIn the imperial system, the long hundredweight is equal to 112 pounds avoirdupois.
hundredweight (short)cwtIn US customary units, one short hundredweight is equal to 100 pounds avoirdupois.
imperial tonL/TImperial ton is another name for the long ton. It has been replaced by the metric ton for most uses.
kilogramkgMetric system. Kilogram is the base unit for mass in the International System of Units. It's equal to about 2.2 lb.
kilotonnektOne kilotonne is equal to 1000 tonnes.
long tonL/TThe long ton is equal to 2240 pounds. It has been replaced by the metric ton in most uses.
megagramMgMetric system. One megagram is one thousand kilograms.
megatonneMtOne megatonne is one million tonnes.
metric graingrmetric grain is a unit used to measure pearls and diamonds. One metric grain is equal to 50 mg.
metric tonM/TMetric ton is another name for tonne. It's equal to one thousand kilogram.
microgramugMetric system. One millionth of a gram.
microtonneutOne millionth of a tonne.
millicentigrammcgAn obsolete unit of measure that is equal to 10ug
milligrammgA thousandth of a gram in the metric system.
millitonnemtOne thousandth of a tonne (one kilogram).
nanogramngMetric system. One billionth of a gram.
nanotonnentOne billionth of a tonne.
ounceozOne avoirdupois ounce is equal to 437.5 grains or about 28.350 grams.
pennyweightdwt1 pennyweight is equal to 24 grains. It's an obsolete unit of measure.
petagramPgMetric system. One petagram is equal to one trillion (1000000000000) kilograms.
petatonnePtMetric system. One petatonne is equal to one quadrillion (1000000000000000) tonnes.
picogrampgMetric system. One trillionth of a gram.
picotonneptOne trillionth of a tonne.
poundlbThis is the international avoirdupois pound and is equal to 16 ounces or 453.59237 grams.
short tonS/TOne short ton is also referred to as ton in the United States. It's equal to 2000 pounds.
stonestThe stone is a unit of measure in the imperial system. One stone is equal to 14 pounds.
teragramTgMetric system. One teragram is equal to one billion (1000000000) kilograms.
teratonneTtOne teratonne is equal to one trillion (1000000000000) tonnes.
tonS/T1 ton (short ton) is equal to 2000 pounds.
tonnetOne tonne, also known as metric tonne is equal to 1000 kilograms.
troy ounceozOne troy ounce is equal to 480 grains in the troy system.
troy poundlbOne troy pound equals 12 troy ounces. The troy pound is used for measuring precious metals and stones.
weight tonL/TWeight ton is another name for the long ton. It has been replaced by the metric ton for most uses.