ConvBolt — Unit ConverterMilligrams to Ounces Converter
Converting milligrams to ounces is a multiplication by a fixed factor: 1 mg = 3.5274e-5 oz. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one milligram works out to 3.5274e-5 oz, the ounce is the far smaller unit of the two: a figure given in ounce always carries a smaller number than the same measurement in milligram. A chart drawn in mg can hide that, so check which label the axis uses before you compare two readings.
Where a legal or postal limit is set in ounces, the same limit expressed in milligrams has to be exact — an overshoot of even one unit can change the chargeable band.
The conversion factor used here is 3.5274e-5 oz per milligram (7 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 mg a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 28349.52 mg per oz, the exact reciprocal, so a round trip through both pages returns your original number.
Milligrams to Ounces formula
Use this formula to convert any milligram value to ounces:
Worked example: 100 mg × 3.5274e-5 = 0.003527396 oz.
Milligrams to Ounces conversion table
| Milligrams (mg) | Ounces (oz) |
|---|---|
| 0.5 mg | 1.7637e-5 oz |
| 1 mg | 3.5274e-5 oz |
| 2 mg | 7.0548e-5 oz |
| 5 mg | 0.0001763698 oz |
| 10 mg | 0.0003527396 oz |
| 20 mg | 0.0007054792 oz |
| 50 mg | 0.001763698 oz |
| 100 mg | 0.003527396 oz |
| 500 mg | 0.01763698 oz |
| 1000 mg | 0.03527396 oz |
How to convert milligrams to ounces
Multiply the milligram value by 3.5274e-5 to get the equivalent in ounces. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Ounces to Milligrams converter instead of dividing by hand; both pages use the same source factors. For every other mg conversion in one place, see the mg conversion hub.
Frequently asked questions
How many ounces are in 1 milligram?
1 milligram = 3.5274e-5 oz.
What is 100 milligrams in ounces?
100 mg = 0.003527396 oz.
Is converting milligrams to ounces the same as ounces to milligrams?
No — the direction changes the multiplier. The reverse conversion (1 oz = 28349.52 mg) is on the Ounces to Milligrams page.
Related conversions
Try the ConvBolt Unit Converter for any other weight unit, browse the Weight conversions, or read our conversion guides.