Convert Ounces to Micrograms

About converting Ounces to Micrograms

Ounces (oz) and Micrograms (µg) are both units of weight & mass, so converting between them is a single multiplication: multiply your Ounces figure by 28,349,523.13. Ten Ounces comes to 283,495,231.25 Micrograms, and a hundred works out at 2,834,952,312.5 Micrograms.

Rule of thumb: going from Ounces to Micrograms multiplies, so the figure always grows — one Ounce is already 28,349,523.13 Micrograms. If your answer came out smaller, you have the conversion the wrong way round.

What is an Ounce?

The ounce here is the avoirdupois ounce, one sixteenth of a pound, and the qualifier matters. The troy ounce used to price gold and silver is noticeably heavier, so a "one ounce" gold coin is not an ounce of anything else — a confusion that has cost people real money. Muddier still is the fluid ounce, which measures volume rather than mass and differs between the US and the UK. The name comes from the Latin uncia, a twelfth part: it was a twelfth of the Roman libra, and the move to sixteen ounces to the pound came later.

What is a Microgram?

A microgram is one millionth of a gram, and in medicine it is a genuinely dangerous unit. Several important drugs — levothyroxine for the thyroid, fentanyl, digoxin — are dosed in micrograms while others are dosed in milligrams, and a prescription misread across that thousandfold gap is a well-documented category of medication error. Because a handwritten Greek µ can be mistaken for an m, hospital safety guidance often requires the abbreviation to be spelled out as "mcg" instead. Outside the clinic, micrograms measure vitamins and airborne pollutants.

To put both in perspective: a slice of sandwich bread weighs about an ounce, while a single grain of table salt weighs a few dozen micrograms.

The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Micrograms to Ounces converter, or browse all Weight & Mass converters.