Mg to Oz Converter

Common questions

What is the formula for mg to oz?

Ounces = milligrams / 28,349.523125. The pound has been exactly 0.45359237 kilograms since the 1959 international agreement on the yard and the pound, and an avoirdupois ounce is a sixteenth of it, so 0.028349523125 kg, or 28,349.523125 mg, is a definition rather than a measurement. This converter divides by that full figure instead of multiplying by a rounded 0.000035, which is why 28,349.523125 mg comes back as exactly 1 oz and not as 0.99999.

How many mg are in an ounce?

28,349.523125 mg in one avoirdupois ounce. Half an ounce is 14,174.7615625 mg, and sixteen ounces, one pound, is 453,592.37 mg. To run it that way round, press the swap button between the two boxes: the page becomes ounces to milligrams and 1 oz gives 28,349.523125 mg.

What is 500 mg in ounces?

0.0176369809748 oz. Because the whole conversion is one division, the digits repeat as the amount scales: 100 mg is 0.00352739619496 oz, 250 mg is 0.0088184904874 oz, 2,500 mg is 0.088184904874 oz and 1 gram, 1,000 mg, is 0.0352739619496 oz. Only the decimal point moves.

Avoirdupois, troy or fluid: which ounce is this?

The avoirdupois ounce, 28.349523125 g, the one used for food, post and everyday weights. A troy ounce is a separate unit of 31.1034768 g, about 10 percent heavier, and it is used only for precious metals; it is deliberately not in the mass list here, because converting bullion with the avoirdupois factor gives the wrong number. For a troy figure, divide the milligrams by 31,103.4768 instead. A fluid ounce is not a mass at all: it is 29.5735295625 mL in the US and 28.4130625 mL imperial, and both sit under the Volume category on the chip strip above the converter.

Why does the decimal never end?

Because 1 mg is 1600/45,359,237 of an ounce, and 45,359,237 is 7 times 6,479,891. A fraction only gives a terminating decimal when its denominator has no prime factor other than 2 and 5, so this one runs on for ever: 0.0000352739619495804129... The page rounds at twelve significant digits and shows 0.0000352739619496. Amounts that are whole ounces come back clean: type 28,349.523125 and the answer is 1.

Why does a tiny amount show as 3.527396e-7?

Below 0.000001 the readout switches to exponential form, because counting leading zeroes is where mistakes happen. 0.01 mg is 3.527396e-7 oz, which is 0.0000003527396 oz written out. Anything larger stays as an ordinary decimal with thousands separators.

Can I convert milligrams to grains or carats here?

Yes. Both unit menus carry the whole mass list, so you can pick Grain or Carat as the target directly: 1 mg is 0.0154323583529 gr and 0.005 ct, since a carat is exactly 200 mg. The list under the answer shows the common units only until you turn on the Uncommon units switch, which adds those three, grain, carat and the UK long ton, to it.

Why does the page open on milligrams and ounces when I last converted something else?

Because a page that names a pair should show that pair. This one sets milligrams and ounces on arrival, ahead of whatever the converter last remembered, and it leaves the main unit converter's own memory alone: go back there and it is still on the pair you left it on. The number you last typed does travel with you, since it is usually the one you are still working on.

Does anything I type leave my browser?

No. The conversion is arithmetic done in the page itself, with the factors built into it, so nothing is uploaded and no account is needed. Copy result puts the plain unformatted number on your clipboard, and each row in the list has its own Copy button.