Ounce to Milligram Converter
Weight · unit-converter
Convert Ounce to Milligram with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Ounce (oz)
To: Milligram (mg)
About Ounce
The avoirdupois ounce is 1/16 of an avoirdupois pound (about 28.35 g). Cooking and postal weights often use ounces.
About Milligram
The milligram is one thousandth of a gram. Medication doses and fine measurements use milligrams.
How to convert ounces to milligrams
1 ounce is equal to 28349.52312499999971 milligram:
1 oz = (28.349523125 g ÷ 0.001 g) mg = 28349.52312499999971 mg
Each ounce is defined as 28.349523125 g and each milligram as 0.001 g, so one oz equals 28.349523125 ÷ 0.001 mg = 28349.52312499999971 mg.
Let w(oz) be the numeric value of the same mass measured in Ounce (oz), and w(mg) the value in Milligram (mg). Then:
w(mg) = w(oz) × (28.349523125 / 0.001)
Equivalently, divide by how many oz fit into one mg (grams per mg divided by grams per oz):
w(mg) = w(oz) ÷ 0.00003527396195
Or: milligram = ounce ÷ 0.00003527396195
Examples
Example #1: Convert 20 oz to milligram
20 oz = 20 oz × (28.349523125/0.001) mg = 566990.4625 mg
20 oz = 20 oz ÷ 0.00003527396195 = 566990.4625 mg
Example #2: Convert 50 oz to milligram
50 oz = 50 oz × (28.349523125/0.001) mg = 1417476.15625 mg
50 oz = 50 oz ÷ 0.00003527396195 = 1417476.15625 mg
Summary
To convert Ounce to Milligram, multiply the value in oz by the ratio of grams per oz divided by grams per mg. Equivalently: value_mg = value_oz × (28.349523125 / 0.001). Numerically, 1 oz equals 28349.523125 mg.
Relationship context
You are converting between imperial / UK (stone, long ton, pound, ounce) (Ounces) and metric (SI) (Milligrams). Metric mass is decimal from the gram; US and imperial masses use pounds and ounces with fixed definitions relative to the kilogram. The numeric factor used here is 2.834952e+4.
Conversion tables
| Ounce (oz) | Milligram (mg) |
|---|---|
| 0.1 | 2,834.9523125 |
| 1 | 28,349.523125 |
| 2 | 56,699.04625 |
| 3 | 85,048.569375 |
| 4 | 113,398.0925 |
| 5 | 141,747.615625 |
| 6 | 170,097.13875 |
| 7 | 198,446.661875 |
| 8 | 226,796.185 |
| 9 | 255,145.708125 |
| Ounce (oz) | Milligram (mg) |
|---|---|
| 10 | 283,495.23125 |
| 20 | 566,990.4625 |
| 30 | 850,485.69375 |
| 40 | 1,133,980.925 |
| 50 | 1,417,476.15625 |
| 60 | 1,700,971.3875 |
| 70 | 1,984,466.6187499999 |
| 80 | 2,267,961.8500000001 |
| 90 | 2,551,457.0812499998 |
| 100 | 2,834,952.3125 |