oz - Ounce. Conversion Chart

This conversion page features historical units (ancient, medieval, etc.) that are mostly no longer in use. If you are looking for units of weight that are used today, including many national units of various countries, please switch to our main weight and mass conversion page.
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1This is a conversion chart for ounce (Avoirdupois (U.S.)). To switch the unit simply find the one you want on the page and click it.
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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

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

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Your value (ounce, oz):
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Metric

We only include several basic units here for you to convert historical units to contemporary ones. A more comprehensive list of metric units is available on the main weight conversion page.
ounce to tonne
ounce to kilogram (kg)
ounce to gram (g)
Units: tonne  / kilogram (kg)  / gram (g)
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Avoirdupois (U.S.)

We only include several basic units here for you to convert historical units to contemporary ones. A more comprehensive list of U.S. units is available on the main weight conversion page.
ounce to short ton (US)
ounce to pound (lb)
Units: short ton (US)  / pound (lb)  /
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Ancient Greek (Attic/Eubolic standard)

Many ancient weights were associated with currency designating the corresponding amount of silver. The same was true for Greek units of weight. There were two dominant weight standard, one originated in Euboea (second largest Greek island after Crete), the other was from Aegina. Archeologists have found though the real weights used in different cities varied greatly.
ounce to talent (τάλαντον)
ounce to mina (μνᾶ)
ounce to dekadrachm (δεκάδραχμον, 10 drachmae)
ounce to tetradrachm (τετράδραχμον, 4 drachmae)
ounce to didrachm (δίδραχμον, 2 drachmae)
ounce to stater (στατήρ, weight)
ounce to drachma (δραχμή, dram)
ounce to tetrobol (τετρώβολον, 4 obols)
ounce to triobol (τριώβολον, 3 obols)
ounce to diobol (διώβολον, 2 obols)
ounce to obol (ὀβολός)
ounce to tritartemorion (τριτημόριον, 3 tetartemoria)
ounce to hemiobol (ἡμιωβόλιον, ½ obol)
ounce to trihemitetartemorion (τριημιτεταρτημόριον, 1½ tetartemorion)
ounce to tetartemorion (ταρτημόριον, ¼ obol)
ounce to hemitetartemorion (ἡμιτεταρτημόριον, ½ tetartemorion)
Units: talent (τάλαντον)  / mina (μνᾶ)  / dekadrachm (δεκάδραχμον, 10 drachmae)  / tetradrachm (τετράδραχμον, 4 drachmae)  / didrachm (δίδραχμον, 2 drachmae)  / stater (στατήρ, weight)  / drachma (δραχμή, dram)  / tetrobol (τετρώβολον, 4 obols)  / triobol (τριώβολον, 3 obols)  / diobol (διώβολον, 2 obols)  / obol (ὀβολός)  / tritartemorion (τριτημόριον, 3 tetartemoria)  / hemiobol (ἡμιωβόλιον, ½ obol)  / trihemitetartemorion (τριημιτεταρτημόριον, 1½ tetartemorion)  / tetartemorion (ταρτημόριον, ¼ obol)  / hemitetartemorion (ἡμιτεταρτημόριον, ½ tetartemorion)
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Ancient Greek (Aeginetic standard)

During ancient times Aegina was a rival of Athens, the great sea power of the era.
ounce to talent (τάλαντον)
ounce to mina (μνᾶ)
ounce to dekadrachm (δεκάδραχμον, 10 drachmae)
ounce to tetradrachm (τετράδραχμον, 4 drachmae)
ounce to didrachm (δίδραχμον, 2 drachmae)
ounce to stater (στατήρ, weight)
ounce to drachma (δραχμή, dram)
ounce to tetrobol (τετρώβολον, 4 obols)
ounce to triobol (τριώβολον, 3 obols)
ounce to diobol (διώβολον, 2 obols)
ounce to obol (ὀβολός)
ounce to tritartemorion (τριτημόριον, 3 tetartemoria)
ounce to hemiobol (ἡμιωβόλιον, ½ obol)
ounce to trihemitetartemorion (τριημιτεταρτημόριον, 1½ tetartemorion)
ounce to tetartemorion (ταρτημόριον, ¼ obol)
ounce to hemitetartemorion (ἡμιτεταρτημόριον, ½ tetartemorion)
Units: talent (τάλαντον)  / mina (μνᾶ)  / dekadrachm (δεκάδραχμον, 10 drachmae)  / tetradrachm (τετράδραχμον, 4 drachmae)  / didrachm (δίδραχμον, 2 drachmae)  / stater (στατήρ, weight)  / drachma (δραχμή, dram)  / tetrobol (τετρώβολον, 4 obols)  / triobol (τριώβολον, 3 obols)  / diobol (διώβολον, 2 obols)  / obol (ὀβολός)  / tritartemorion (τριτημόριον, 3 tetartemoria)  / hemiobol (ἡμιωβόλιον, ½ obol)  / trihemitetartemorion (τριημιτεταρτημόριον, 1½ tetartemorion)  / tetartemorion (ταρτημόριον, ¼ obol)  / hemitetartemorion (ἡμιτεταρτημόριον, ½ tetartemorion)
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Ancient Roman

The base Roman unit of weight was libra (Roman pound) that contained 12 uncias. Modern estimates of the libra ranges from 322 to 329 grams with 328.9 grams an accepted figure. The base unit for coins was as that used to be 12 uncias initially and then gradually reduced to only half an uncia. Another silver coin was called denarius equal to 10 asses (from Latin dēnī - containing ten), it was later recalibrated to contain 16 asses or four sestertii. A literal meaning of each unit is given in parentheses.
ounce to libra (Roman pound, balance)
ounce to deunx (11⁄12 libra, less a twelfth)
ounce to dextans (10⁄12 libra, less a sixth)
ounce to dodrans (9⁄12 libra, less a fourth)
ounce to bes (8⁄12 libra, two of an as)
ounce to septunx (7⁄12 libra, seven-twelfths)
ounce to semis (6⁄12 libra, a half)
ounce to quincunx (5⁄12 libra, five-twelfths)
ounce to triens (4⁄12 libra, a third)
ounce to quadrans (1⁄4 libra, a fourth)
ounce to teruncius (3⁄12 libra, triple twelfth)
ounce to sextans (2⁄12 libra, a sixth)
ounce to sescuncia (1⁄8 libra, 1½ twelfths)
ounce to uncia (Roman ounce, a twelfth)
ounce to semuncia (½ uncia, half-twelfth)
ounce to duella (⅓ uncia, little double [sixths])
ounce to sicilicus (¼ uncia, little sickle)
ounce to sextula (1⁄6 uncia, little sixth)
ounce to drachma (1⁄8 uncia, from Greek unit δραχμή)
ounce to semisextula (1⁄12 uncia, half-little sixth)
ounce to scrupulum (1⁄24 uncia, small pebble)
ounce to obolus (1⁄48 uncia, from Greek unit ὀβολός 'metal spit')
ounce to siliqua (1⁄144 uncia, carat, carob seed)
Units: libra (Roman pound, balance)  / deunx (11⁄12 libra, less a twelfth)  / dextans (10⁄12 libra, less a sixth)  / dodrans (9⁄12 libra, less a fourth)  / bes (8⁄12 libra, two of an as)  / septunx (7⁄12 libra, seven-twelfths)  / semis (6⁄12 libra, a half)  / quincunx (5⁄12 libra, five-twelfths)  / triens (4⁄12 libra, a third)  / quadrans (1⁄4 libra, a fourth)  / teruncius (3⁄12 libra, triple twelfth)  / sextans (2⁄12 libra, a sixth)  / sescuncia (1⁄8 libra, 1½ twelfths)  / uncia (Roman ounce, a twelfth)  / semuncia (½ uncia, half-twelfth)  / duella (⅓ uncia, little double [sixths])  / sicilicus (¼ uncia, little sickle)  / sextula (1⁄6 uncia, little sixth)  / drachma (1⁄8 uncia, from Greek unit δραχμή)  / semisextula (1⁄12 uncia, half-little sixth)  / scrupulum (1⁄24 uncia, small pebble)  / obolus (1⁄48 uncia, from Greek unit ὀβολός 'metal spit')  / siliqua (1⁄144 uncia, carat, carob seed)
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Biblical

Israelites initially followed Babylonian system of units, but the units were later altered. There were royal and common versions of units and each of these forms had heavy and light versions. Gradually the system reformed again under the Egyptian influence. For example a shekel (silver coin) could weigh anything between 8 and 16 grams in various places and periods of history. That's why it is impossible get an exact conversion from biblical units to contemporary ones.
ounce to talent
ounce to mina
ounce to shekel
ounce to pim
ounce to beka
ounce to gerah
Units: talent  / mina  / shekel  / pim  / beka  / gerah
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Baha'i Faith Units

The Bahá'í Faith is a religion teaching the essential worth of all religions, and the unity and equality of all people. It was establised in Persia in 1863.
ounce to mithqal
ounce to nakhud
Units: mithqal  / nakhud
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Old Spanish

ounce to tonelada
ounce to fanega de trigo (bushel of wheat)
ounce to fanega de centeno (bushel of rye)
ounce to fanega de cebada (bushel of barley)
ounce to quintal
ounce to arroba
ounce to libra
ounce to marco
ounce to cuarterón
ounce to onza
ounce to ochava
ounce to adarme
ounce to grano
Units: tonelada  / fanega de trigo (bushel of wheat)  / fanega de centeno (bushel of rye)  / fanega de cebada (bushel of barley)  / quintal  / arroba  / libra  / marco  / cuarterón  / onza  / ochava  / adarme  / grano
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Old Portuguese

These units were used in Portugal, Brazil and other countries of the Portuguese Empire until the adoption of the metric system in 19th century.
ounce to tonelada
ounce to quintal
ounce to arroba
ounce to arrátel (libra)
ounce to quarta
ounce to onça
ounce to oitava
ounce to escrópulo
ounce to grão
Units: tonelada  / quintal  / arroba  / arrátel (libra)  / quarta  / onça  / oitava  / escrópulo  / grão
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Old Russian

ounce to berkovets
ounce to pood
ounce to pound
ounce to lot
ounce to zolotnik
ounce to dolya
Units: berkovets  / pood  / pound  / lot  / zolotnik  / dolya
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Old French

There were many local variations; the following are Quebec and Paris definitions
ounce to quintal
ounce to livre
Units: quintal  / livre
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Old German (Prussian)

These units were used before adoption of metric system in 1872.
ounce to schiffspfund
ounce to doppelzentner
ounce to zentner
ounce to stain
ounce to pfund
ounce to mark
ounce to unze
ounce to loth
ounce to quentchen
ounce to quint
ounce to pfennig
ounce to gran
Units: schiffspfund  / doppelzentner  / zentner  / stain  / pfund  / mark  / unze  / loth  / quentchen  / quint  / pfennig  / gran
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Old Austrian

These units were used before adoption of metric system in 1871.
ounce to karch
ounce to saum
ounce to zentner
ounce to stain
ounce to pfund
ounce to mark
ounce to vierding
ounce to unze
ounce to loth
ounce to quentchen
ounce to denzt
Units: karch  / saum  / zentner  / stain  / pfund  / mark  / vierding  / unze  / loth  / quentchen  / denzt
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Old Swedish

Common measurement system was introduced in Sweden by law in 1665. The oldest units like mark were used since Viking era. Sweden switched to metric system in 1889.
ounce to skeppspund
ounce to lispund
ounce to bismerpund
ounce to skålpund
ounce to mark
ounce to ort
Units: skeppspund  / lispund  / bismerpund  / skålpund  / mark  / ort

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