Convert Weight and Mass Units Instantly

This converter features contemporary units of weight. There is also a special converter for historical units of weight you might want to visit for ancient, medieval and other old units that are no longer used.
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Conversion settings explained

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Number of significat figures

Do you want rounded off figures or scientifically precise ones? For everyday conversions we recommend choosing 3 or 4 significant digits. If you want maximum precision, set the number to 9

Digit groups separator

Choose how you want to have your digit groups separated in long numbers:

1234567.89none
1 234 567.89space
1,234,567.89comma
1.234.567,89point

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  • Significant figures:
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Metric

kilotonne
tonne
kilonewton (on Earth surface) (kN)
metric centner
metric quintal
kilogram (kg)
newton (on Earth surface) (N)
carat (ct)
gram (g)
centigram
milligram (mg)
microgram (mcg)
atomic mass unit (amu)
Units: kilotonne  / tonne  / kilonewton (on Earth surface) (kN)  / metric centner  / metric quintal  / kilogram (kg)  / newton (on Earth surface) (N)  / carat (ct)  / gram (g)  / centigram  / milligram (mg)  / microgram (mcg)  / atomic mass unit (amu)
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Avoirdupois (U.S. / British)

long ton (UK)
short ton (US)
kilopound, kip (mass)
long hundredweight (UK)
British centner
short hundredweight (US)
stone (st)
stone, pounds, and ounces (X st Y lbs Z oz)
pound (lb)
ounce (oz)
dram (dr)
grain (gr)
Units: long ton (UK)  / short ton (US)  / kilopound, kip (mass)  / long hundredweight (UK)  / British centner  / short hundredweight (US)  / stone (st)  / stone, pounds, and ounces (X st Y lbs Z oz)  / pound (lb)  / ounce (oz)  / dram (dr)  / grain (gr)
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Troy

pound
ounce (ozt)
pennyweight (dwt)
carat
grain
mite
doite
Units: pound  / ounce (ozt)  / pennyweight (dwt)  / carat  / grain  / mite  / doite
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Apothecaries

The traditional English apothecaries' system was a subset of Roman weight system except that Roman libra (pound) was slightly lighter. In 1858 apothercaries' system was officially abolished in in the U.K. in favour of the standard Avoirdupois system. However, in the United States the apothecaries' system remained in use until 1971, when it was officially abolished in favor of the metric system.
pound (℔, ″)
ounce (℥)
dram (drachm) (ʒ)
scruple (℈)
grain (gr)
Units: pound (℔, ″)  / ounce (℥)  / dram (drachm) (ʒ)  / scruple (℈)  / grain (gr)
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Natural units

In physics, natural units are physical units of measurement based only on universal physical constants. The origin of their definition comes only from properties of nature and not from any human construct.
Planck mass (M)
Units: Planck mass (M)
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Indian units (Akbar system)

The first uniform system of units was introduced in India by the third imperor Akbar I in 16th century. Before him weights and measures varied from region to region. Unfortunately, the new measures did not replace all the previous ones, they just added another system.

Akbar system of units was based on barley corn (Jau) for both weigth and length. It was widely used in India until adoption of the metric system in 1958. The weight units were slightly altered in 1833 to align with the British system. Here we provide conversion for the units after this change.

candy
maund
dhurra
ralk
sèr
powa
chittak
parah
tank
tolä
māshā
rattī
Units: candy  / maund  / dhurra  / ralk  / sèr  / powa  / chittak  / parah  / tank  / tolä  / māshā  / rattī
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Japanese

kan, kanme (貫, 貫目)
kin (斤)
hyakume (百目)
monnme (匁)
fun (分)
Units: kan, kanme (貫, 貫目)  / kin (斤)  / hyakume (百目)  / monnme (匁)  / fun (分)
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Chinese units since 1959

dan (市担 / 擔)
jin (市斤)
liang (市两)
qian (市钱)
fen (市分)
li (市厘)
hao (毫)
si (絲)
hu (忽)
Units: dan (市担 / 擔)  / jin (市斤)  / liang (市两)  / qian (市钱)  / fen (市分)  / li (市厘)  / hao (毫)  / si (絲)  / hu (忽)
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Chinese units between 1930 and 1959

dan (擔 / 担)
jin (市斤)
liang (市兩)
qian (市錢)
fen (市分)
li (市釐)
hao (毫)
si (絲)
Units: dan (擔 / 担)  / jin (市斤)  / liang (市兩)  / qian (市錢)  / fen (市分)  / li (市釐)  / hao (毫)  / si (絲)
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Chinese units of 1915 before 1930

jin (斤)
liang (兩)
qian (錢)
fen (分)
li (釐)
hao (毫)
Units: jin (斤)  / liang (兩)  / qian (錢)  / fen (分)  / li (釐)  / hao (毫)
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Thai units

Some of these units are still in use even though metric system was formally established in 1923. Before the metrication the old units were standartied to exact metric values. The baht (current Thai currency) originated as a corresponding measure of silver. The smaller units in this section were corresponding silver coins.
hap (หาบ)
chang (ชั่ง)
tamlueng (ตำลึง)
baht (บาท)
baht in gold trading
mayon/mayong (มายน/มะยง)
salueng (สลึง)
fueang (เฟื้อง)
seek (ซีก)
siao/pai (เสี้ยว/ไพ)
ath (อัฐ)
solos (โสฬส)
bia (เบี้ย)
Units: hap (หาบ)  / chang (ชั่ง)  / tamlueng (ตำลึง)  / baht (บาท)  / baht in gold trading  / mayon/mayong (มายน/มะยง)  / salueng (สลึง)  / fueang (เฟื้อง)  / seek (ซีก)  / siao/pai (เสี้ยว/ไพ)  / ath (อัฐ)  / solos (โสฬส)  / bia (เบี้ย)
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Hong Kong

picul (tam)
catty (kan)
tael (leung)
mace (tsin)
candareen (fan)
tael troy
mace troy
candareen troy
Units: picul (tam)  / catty (kan)  / tael (leung)  / mace (tsin)  / candareen (fan)  / tael troy  / mace troy  / candareen troy

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