Ounce to Milligram (oz to mg)
Result
28,349.52313 Milligram
Formula
mg = oz × 28,349.52313
1 oz = 28,349.52313 mg, and 1 mg = 0.000035273962 oz.
The kilogram is the SI base unit of mass, defined through the Planck constant since 2019. The international avoirdupois pound is exactly 0.45359237 kg; the ounce is 1/16 lb and the stone 14 lb.
Worked examples
- 1 oz × 28,349.52313 = 28,349.523 mg
- 10 oz × 28,349.52313 = 283,495.23 mg
- 100 oz × 28,349.52313 = 2,834,952.3 mg
Common mistakes
- Precious metals use the troy ounce (31.1034768 g), about 10% heavier than the avoirdupois ounce (28.349523125 g) used for food and parcels.
- "Ton" is ambiguous: the metric tonne used here is 1,000 kg, the US short ton 907.18474 kg and the UK long ton 1,016.0469088 kg.
- Kilograms and pounds measure mass. Pound-force (lbf) and newtons measure force — they are not interchangeable with kg.
Ounce to Milligram table
| Ounce (oz) | Milligram (mg) |
|---|---|
| 1 | 28,349.523 |
| 2 | 56,699.046 |
| 5 | 141,747.62 |
| 10 | 283,495.23 |
| 20 | 566,990.46 |
| 50 | 1,417,476.2 |
| 100 | 2,834,952.3 |
| 1,000 | 28,349,523 |
The units
- Ounce (oz)
- The avoirdupois ounce, 1/16 lb = 28.349523125 g. Not the troy ounce used for gold.
- Milligram (mg)
- One millionth of a kilogram (0.001 g).
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy