Convert weight and mass units — kilograms, pounds, ounces, grams, tons, stones.
| Unit | Name | Value |
|---|---|---|
| kg | Kilogram | 0.0283495 |
| g | Gram | 28.3495 |
| mg | Milligram | 28349.5 |
| t | Metric Ton | 0.0000283495 |
| lb | Pound | 0.0625 |
| st | Stone | 0.0044642843 |
The Ounce (oz) and the Milligram (mg) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 oz = 28349.5 mg
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Ounce (oz) | Milligram (mg) | Real-world context |
|---|---|---|
| 0.001 oz | 28.3495 mg | |
| 0.01 oz | 283.495 mg | |
| 0.1 oz | 2834.95 mg | |
| 1 oz | 28349.5 mg | letter envelope |
| 10 oz | 283495 mg |
1 ounce (oz) equals exactly 28349.5 milligrams (mg). Use the formula: oz × 28349.5 = mg.
To convert ounces to milligrams, multiply your value in ounces by 28349.5. For example, 5 oz × 28349.5 = 141747.5 mg.
100 ounces = 2,834,950 milligrams. Calculation: 100 × 28349.5 = 2,834,950.
To convert milligrams back to ounces, divide by 28349.5 (or multiply by 3.5274e-05). Example: 10 mg ÷ 28349.5 = 0.00035274 oz.
Yes. This converter uses the internationally recognised exact conversion factor: 1 oz = 28349.5 mg. All calculations are performed in your browser with no rounding until display.
10 ounces = 283495 milligrams. Simply multiply by 28349.5.
Converting ounces to milligrams is commonly needed for medical dosing, laboratory measurements, pharmaceutical calculations, and quality control testing where one system uses oz and another uses mg.
The avoirdupois ounce (oz) equals exactly 28.349523125 grams or 1/16 of an avoirdupois pound. It is widely used in the US and UK for food portions, product packaging, and everyday measurements. Note that the troy ounce (31.1035 g), used for precious metals like gold and silver, is a different and heavier unit than the avoirdupois ounce.
The milligram (mg) is a unit of mass equal to one-thousandth of a gram (0.001 g) or one-millionth of a kilogram (10⁻⁶ kg). It is the standard unit for drug dosing in medicine and pharmacology, where precise small quantities are critical for safety and efficacy. The prefix "milli-" comes from Latin mille meaning one thousand.
The word "ounce" derives from Latin uncia (a twelfth), originally 1/12 of the Roman pound. The avoirdupois ounce developed in medieval England specifically for the wool trade, creating a 16-ounce pound distinct from the Troy 12-ounce pound. The British Imperial system codified the ounce in 1824. The modern exact definition (28.349523125 g) was set by the 1959 International Yard and Pound Agreement.
Interesting fact: A troy ounce (31.1 g) used for gold is heavier than an avoirdupois ounce (28.35 g) used for food — so an "ounce" of gold contains more metal than an "ounce" of flour. A standard large hen's egg weighs approximately 56–63 grams (about 2 oz).
Established as a derived unit when the metric system was formalised in the late 18th century. The milligram rose to critical importance with the growth of pharmacology in the 19th and 20th centuries, as chemists isolated active compounds and found that tiny quantities produced strong therapeutic — or toxic — effects. Modern pharmacopoeias worldwide specify drug doses in milligrams.
Interesting fact: A single grain of table salt weighs about 58 mg. One standard 325 mg aspirin tablet means that 1,000 tablets weigh only 325 grams — less than a can of soft drink.