Ounces to milligrams

milligrams = ounces × 28,349.52

How to convert ounces to milligrams

One ounce is 28,349.52 milligrams, so multiply the number of ounces by 28,349.52. For example, 20 ounces is 20 × 28,349.52 = 566,990.46 milligrams. To go back, divide by the same number, or multiply by 0.00003527.

Quick estimate

Multiplying by about 30000 gets within 5.8% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Mass conversions come up in cooking and baking, shipping and luggage limits, body weight, medicine doses and buying food by weight.

ounces	milligrams
1 oz	28,349.52 mg
2 oz	56,699.05 mg
3 oz	85,048.57 mg
4 oz	113,398.09 mg
5 oz	141,747.62 mg
6 oz	170,097.14 mg
7 oz	198,446.66 mg
8 oz	226,796.19 mg
9 oz	255,145.71 mg
10 oz	283,495.23 mg
11 oz	311,844.75 mg
12 oz	340,194.28 mg
13 oz	368,543.8 mg
14 oz	396,893.32 mg
15 oz	425,242.85 mg
16 oz	453,592.37 mg
17 oz	481,941.89 mg
18 oz	510,291.42 mg
19 oz	538,640.94 mg
20 oz	566,990.46 mg
25 oz	708,738.08 mg
30 oz	850,485.69 mg
40 oz	1,133,980.93 mg
50 oz	1,417,476.16 mg
60 oz	1,700,971.39 mg
70 oz	1,984,466.62 mg
75 oz	2,126,214.23 mg
80 oz	2,267,961.85 mg
90 oz	2,551,457.08 mg
100 oz	2,834,952.31 mg
120 oz	3,401,942.78 mg
150 oz	4,252,428.47 mg
200 oz	5,669,904.63 mg
250 oz	7,087,380.78 mg
300 oz	8,504,856.94 mg
400 oz	11,339,809.25 mg
500 oz	14,174,761.56 mg
750 oz	21,262,142.34 mg
1,000 oz	28,349,523.13 mg
1,500 oz	42,524,284.69 mg
2,000 oz	56,699,046.25 mg
5,000 oz	141,747,615.63 mg
10,000 oz	283,495,231.25 mg

Questions

How many milligrams are in a ounce?

28,349.52 milligrams.

How do I convert ounces to milligrams in a spreadsheet?

Put the value in A1 and type =A1*28349.52, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.