Ounce (oz) Weight Conversion Calculator

Ounce Conversion Calculator

Enter a value in ounces below to convert to another unit of weight.

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What Is an Ounce?

An ounce is a unit used to measure weight.

The ounce is a US customary and imperial unit of weight. Ounces can be abbreviated as oz; for example, 1 ounce can be written as 1 oz.

How Much Is an Ounce?

One ounce is a unit of mass/weight equal to 1/16 of a pound or 28.349523 grams. The common ounce should not be confused with the troy ounce, which is equal to 1/12 of a troy pound.^[1]

How to Convert Ounces

To convert ounces to another unit of weight, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.^[2]

You can find the conversion factors for ounces in the conversion table below.

Then, multiply the weight measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

ounces × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

Ounce Conversion Table

Common ounce values and equivalent imperial and metric weight measurements
ounces	tons	pounds	metric tons	kilograms	grams	milligrams	calories	long tons	carats
1 oz	0.00003125 t	0.0625 lb	0.00002835 t	0.02835 kg	28.349523 g	28,350 mg	218.75 kcal	0.000027902 lt	141.747616 ct
2 oz	0.0000625 t	0.125 lb	0.000056699 t	0.056699 kg	56.699046 g	56,699 mg	437.5 kcal	0.000055804 lt	283.495231 ct
3 oz	0.00009375 t	0.1875 lb	0.000085049 t	0.085049 kg	85.048569 g	85,049 mg	656.25 kcal	0.000083705 lt	425.242847 ct
4 oz	0.000125 t	0.25 lb	0.000113 t	0.113398 kg	113.398093 g	113,398 mg	875 kcal	0.000112 lt	566.990463 ct
5 oz	0.000156 t	0.3125 lb	0.000142 t	0.141748 kg	141.747616 g	141,748 mg	1,094 kcal	0.00014 lt	708.738078 ct
6 oz	0.000188 t	0.375 lb	0.00017 t	0.170097 kg	170.097139 g	170,097 mg	1,313 kcal	0.000167 lt	850.485694 ct
7 oz	0.000219 t	0.4375 lb	0.000198 t	0.198447 kg	198.446662 g	198,447 mg	1,531 kcal	0.000195 lt	992.233309 ct
8 oz	0.00025 t	0.5 lb	0.000227 t	0.226796 kg	226.796185 g	226,796 mg	1,750 kcal	0.000223 lt	1,134 ct
9 oz	0.000281 t	0.5625 lb	0.000255 t	0.255146 kg	255.145708 g	255,146 mg	1,969 kcal	0.000251 lt	1,276 ct
10 oz	0.000313 t	0.625 lb	0.000283 t	0.283495 kg	283.495231 g	283,495 mg	2,188 kcal	0.000279 lt	1,417 ct
11 oz	0.000344 t	0.6875 lb	0.000312 t	0.311845 kg	311.844754 g	311,845 mg	2,406 kcal	0.000307 lt	1,559 ct
12 oz	0.000375 t	0.75 lb	0.00034 t	0.340194 kg	340.194278 g	340,194 mg	2,625 kcal	0.000335 lt	1,701 ct
13 oz	0.000406 t	0.8125 lb	0.000369 t	0.368544 kg	368.543801 g	368,544 mg	2,844 kcal	0.000363 lt	1,843 ct
14 oz	0.000438 t	0.875 lb	0.000397 t	0.396893 kg	396.893324 g	396,893 mg	3,063 kcal	0.000391 lt	1,984 ct
15 oz	0.000469 t	0.9375 lb	0.000425 t	0.425243 kg	425.242847 g	425,243 mg	3,281 kcal	0.000419 lt	2,126 ct
16 oz	0.0005 t	1 lb	0.000454 t	0.453592 kg	453.59237 g	453,592 mg	3,500 kcal	0.000446 lt	2,268 ct
17 oz	0.000531 t	1.0625 lb	0.000482 t	0.481942 kg	481.941893 g	481,942 mg	3,719 kcal	0.000474 lt	2,410 ct
18 oz	0.000563 t	1.125 lb	0.00051 t	0.510291 kg	510.291416 g	510,291 mg	3,938 kcal	0.000502 lt	2,551 ct
19 oz	0.000594 t	1.1875 lb	0.000539 t	0.538641 kg	538.640939 g	538,641 mg	4,156 kcal	0.00053 lt	2,693 ct
20 oz	0.000625 t	1.25 lb	0.000567 t	0.56699 kg	566.990463 g	566,990 mg	4,375 kcal	0.000558 lt	2,835 ct