Convert Milligrams to Ounces
Milligram (mg) to Ounce (oz) unit conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 mg = 3.5274E-05 oz
1 Milligram = 3.5274E-05 Ounces
1 Ounce = 28349.523 Milligrams
1 mg in every supported unit
Conversion chart: Milligram to Ounces
Conversion table
| Milligram (mg) | Ounce (oz) |
|---|---|
| 0.01 mg | 3.5274E-07 oz |
| 0.1 mg | 3.5274E-06 oz |
| 1 mg | 3.5274E-05 oz |
| 2 mg | 7.05479E-05 oz |
| 3 mg | 0.00010582189 oz |
| 5 mg | 0.00017636981 oz |
| 10 mg | 0.00035273962 oz |
| 20 mg | 0.00070547924 oz |
| 50 mg | 0.0017636981 oz |
| 100 mg | 0.0035273962 oz |
| 1000 mg | 0.035273962 oz |
Milligram (mg)
Definition: One thousandth of a gram (10⁻³ g), or one millionth of a kilogram — the smallest commonly used decimal unit of mass.
History: Introduced as part of the French metric reform of the 1790s, defined as a decimal subdivision of the gram once the gram itself was fixed relative to a cubic centimeter of water.
Current use: Used almost exclusively in contexts demanding fine precision — pharmaceutical dosing, nutrition labels (vitamins and minerals), and laboratory chemistry, where even small mass errors matter.
Ounce (oz)
Definition: Defined internationally since 1959 as exactly 28.349523125 grams; equal to one-sixteenth of an avoirdupois pound.
History: Derived from the Roman "uncia," a twelfth part of the Roman pound (libra), the same root that also gives the inch its name as a twelfth of a foot. England adopted the avoirdupois system in the 13th–14th centuries, fixing the ounce at 1/16 of its pound.
Current use: Common in the US, UK, and a few other countries for food portions, postal weight, and precious metals — though gold, silver, and other precious metals use the separate troy ounce (31.1035 g), not the avoirdupois ounce used here.
Supported Units
| Unit | Symbol | In Kilograms |
|---|---|---|
| Milligram | mg | 1E-06 kg |
| Gram | g | 0.001 kg |
| Kilogram | kg | 1 kg |
| Metric Ton | t | 1000 kg |
| Ounce | oz | 0.028349523 kg |
| Pound | lb | 0.45359237 kg |
| Stone | st | 6.3502932 kg |
| US Ton | tn | 907.18474 kg |
| Long Ton | long tn | 1016.0469 kg |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Weight Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to the kilogram. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Milligram → Ounce: multiply by 3.5274E-05. For example, 1 mg × 3.5274E-05 = 3.5274E-05 oz.
Weight vs. Mass
Strictly speaking, mass measures the amount of matter in an object, while weight measures the force gravity exerts on that mass — an object's mass stays the same on the Moon, but its weight (in newtons) drops to about one-sixth of its Earth value. In everyday language and on this page, "weight" and "mass" are used interchangeably, as they are in commerce and daily life, because all the units here (kilogram, pound, ounce, and so on) are technically units of mass measured under standard Earth gravity.
Metric vs. Avoirdupois
The metric units on this page (milligram through metric ton) all scale by powers of ten, so converting between them is just moving a decimal point. The avoirdupois system (ounce, pound, stone, US ton, long ton) uses irregular multiples — 16 ounces to a pound, 14 pounds to a stone, 2,000 pounds to a US ton — inherited from centuries of English trade custom that predate the metric system.
Metric Tonne vs. US Ton vs. Long Ton
These three "ton" units are often confused but are meaningfully different: a metric ton (tonne) is exactly 1,000 kg (≈2,204.6 lb), a US or "short" ton is 2,000 lb (≈907.2 kg), and a British or "long" ton is 2,240 lb (≈1,016.0 kg). The metric tonne sits between the two — about 10% heavier than a US ton and about 1.6% lighter than a long ton — which makes it easy to misquote freight or cargo weights if the unit isn't specified explicitly.
Example
1 mg equals 3.5274E-05 oz. For scale, that's about 0× the weight of an average adult (70 kg, or 70000000 mg).
Frequently Asked Questions
How many Ounces are in 1 Milligram?
1 Milligram (mg) equals exactly 3.5274E-05 Ounces (oz).
What is the difference between a US ton and a metric ton?
A US (short) ton is 2,000 pounds (907.18 kg), while a metric ton (tonne) is exactly 1,000 kg (about 2,204.6 lb) — the metric ton is roughly 10% heavier, so the two should never be used interchangeably in shipping, trade, or engineering documents.
Why do the UK and Ireland measure body weight in stone?
Stone (14 lb) has been used informally for body weight in Britain and Ireland since the 19th century and remains common in everyday speech, medical settings, and sports reporting there, even though the UK officially uses the metric system for trade and most other measurements.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally standardized value (e.g. 1 pound = exactly 0.45359237 kg, fixed by international agreement in 1959) — results are limited only by floating-point display precision, not by rounded conversion constants.