How do I convert Ounce (oz) to Milligram (mg)?

1 oz equals 28349.523125 mg using SI-based conversion and precise factors.

What is the formula to convert Ounce (oz) to Milligram (mg)?

This is a linear unit conversion using a constant factor between units.

Yes, it uses exact definitions or standardized constants (e.g., 1 in = 25.4 mm).

Use the shareable URL pattern: /convert/oz-to-mg/1

Category: Mass

Value From To Precision

28349.523125 mg

1 oz = 28349.523125 mg

High-precision rounding: 6 decimals

We convert by pivoting through the SI base unit for Mass and applying exact factors where applicable.

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Mass quantifies matter. The SI kilogram is defined via fundamental constants.

Ounce (oz)

1/16 lb; 28.349523125 g (exact).

History: Evolved from medieval trade systems.

Milligram (mg)

1/1,000,000 of a kilogram; micro-dosing, lab work.

History: Used widely with precision balances.