How to Convert Milligrams to Ounces (mg to oz)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert milligrams into ounces by hand, with examples and a quick-reference table.
The conversion
To convert milligrams to ounces, multiply the value by 3.527396e-05. To go the other way, divide by the same number (or multiply by 28,349.523125). Because the factor is tiny, scientific notation keeps the numbers manageable.
Ounces = milligrams × 3.527396e-05
Worked examples
- 3 mg = 0.000106 oz
- 12.5 mg = 0.000441 oz
- 75 mg = 0.002646 oz
Milligrams to Ounces table
| Milligrams | Ounces |
|---|---|
| 1 mg | 3.527396e-5 oz |
| 2 mg | 7.054792e-5 oz |
| 5 mg | 0.000176 oz |
| 10 mg | 0.000353 oz |
| 20 mg | 0.000705 oz |
| 25 mg | 0.000882 oz |
| 50 mg | 0.001764 oz |
| 100 mg | 0.003527 oz |
| 250 mg | 0.008818 oz |
| 500 mg | 0.017637 oz |
| 1,000 mg | 0.035274 oz |
Common questions
Is mg to oz exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Ounces to Milligrams converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Milligrams to Ounces Converter or browse all weight converters.
Run your own numbers: Milligrams to Ounces Converter