Convert Ounces to Milligrams

Enter your ounce value in the form below to get the value calculated in milligrams.

Results in Milligrams:

1 oz = 28,349.523125 mg

How to Convert Ounces to Milligrams

Save Share Tweet

Convert ounces to milligrams with this simple formula:

milligrams = ounces × 28,349.523125

Converting an ounce weight measurement to a milligram measurement involves multiplying the weight by the conversion ratio to find the result. One ounce is equal to 28,349.523125 milligrams, so to convert simply multiply by 28,349.523125.

For example, here's how to convert 5 ounces to milligrams using the formula above.

5 oz = (5 × 28,349.523125) = 141,747.615625 mg

Ounces and milligrams are both units used to measure weight. Learn more about weight and find more weight measurement conversion calculators. Ounces are an imperial measurement and can be abbreviated as oz, for example 1 oz. Milligrams are a metric measurement and can be abbreviated as mg, for example 1 mg. Learn more about the metric system, including the common unit prefixes and how to convert between metric units.

ounces and milligrams are units used to measure weight

Convert Milligrams to Ounces

Ounce Measurements and Equivalent Milligram Conversions

Common ounce values converted to the equivalent milligram value
Ounces	Milligrams
1 oz	28,350 mg
2 oz	56,699 mg
3 oz	85,049 mg
4 oz	113,398 mg
5 oz	141,748 mg
6 oz	170,097 mg
7 oz	198,447 mg
8 oz	226,796 mg
9 oz	255,146 mg
10 oz	283,495 mg
11 oz	311,845 mg
12 oz	340,194 mg
13 oz	368,544 mg
14 oz	396,893 mg
15 oz	425,243 mg
16 oz	453,592 mg
17 oz	481,942 mg
18 oz	510,291 mg
19 oz	538,641 mg
20 oz	566,990 mg
21 oz	595,340 mg
22 oz	623,690 mg
23 oz	652,039 mg
24 oz	680,389 mg
25 oz	708,738 mg
26 oz	737,088 mg
27 oz	765,437 mg
28 oz	793,787 mg
29 oz	822,136 mg
30 oz	850,486 mg
31 oz	878,835 mg
32 oz	907,185 mg
33 oz	935,534 mg
34 oz	963,884 mg
35 oz	992,233 mg
36 oz	1,020,583 mg
37 oz	1,048,932 mg
38 oz	1,077,282 mg
39 oz	1,105,631 mg
40 oz	1,133,981 mg