---
title: "Ounces to Milligrams — oz to mg converter"
description: "1 ounce = 28,349.523 milligrams. Convert ounces to milligrams with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/oz-to-mg/
site: "At One Place"
---

# Ounces to milligrams

**1 ounce in milligrams: 1 oz = 28,349.523 mg**

mg = oz × 28,349.52313

To convert ounces to milligrams, multiply by 28,349.52313. The table below gives the values people look up most often, and the converter works for any number.

## Ounces to milligrams table

*Common ounce values converted to milligrams.*

| Ounces | Milligrams |
| --- | --- |
| 1 oz | 28,349.523 |
| 2 oz | 56,699.046 |
| 3 oz | 85,048.569 |
| 4 oz | 113,398.09 |
| 5 oz | 141,747.62 |
| 10 oz | 283,495.23 |
| 15 oz | 425,242.85 |
| 20 oz | 566,990.46 |
| 25 oz | 708,738.08 |
| 30 oz | 850,485.69 |
| 40 oz | 1,133,980.9 |
| 50 oz | 1,417,476.2 |
| 75 oz | 2,126,214.2 |
| 100 oz | 2,834,952.3 |
| 250 oz | 7,087,380.8 |
| 500 oz | 14,174,762 |
| 1,000 oz | 28,349,523 |

## How the conversion works

The relationship is mg = oz × 28,349.52313. Both units measure mass, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

## Common questions

### How many milligrams are in one ounce?

One ounce equals 28,349.523 milligrams. mg = oz × 28,349.52313.

### How do you convert ounces to milligrams?

Use mg = oz × 28,349.52313. So 10 oz is 283,495.23 mg.

### How many ounces are in one milligram?

One milligram equals 0.00003527 ounces, which is the reverse of the conversion above.

## Related pages

- [Milligrams to Ounces](https://atoneplace.net/convert/mg-to-oz/)
- [Ounces to Kilograms](https://atoneplace.net/convert/oz-to-kg/)
- [Ounces to Grams](https://atoneplace.net/convert/oz-to-grams/)
- [Ounces to Tonnes](https://atoneplace.net/convert/oz-to-tonnes/)
- [Ounces to Pounds](https://atoneplace.net/convert/oz-to-lbs/)
- [Ounces to Stone](https://atoneplace.net/convert/oz-to-stone/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)