Welcome to mg to mcg, our article explaining the milligrams to micrograms conversion. If you have been googling for how many mcg in a mg or mg in mcg, then you have definitively come to the right place. Using the SI unit symbols, milligrams are abbreviated as mg, and micrograms, using the official symbol, is written as μg. However, especially in the US it’s common to spell the unit microgram in short form as mcg. Read on to learn all about the conversion of mg to mcg, and make sure to check out our mass converter on this page.

Convert MG to MCG

In mg the m stands for milli (10-3), and in μg (mcg) the μ denotes micro (10-6). Therefore, the milligrams to micrograms formula is [mcg] = [mg] × 1000.

To convert mg to mcg simply multiply mass in mg by 1000, because both, the milligram as well as the microgram, are submultiples of the metric base unit of mass kilogram.

For example, if you have 3 milligrams then this mass is equivalent to 3000 micrograms. Doing mental arithmetic or by means of a calculator: 3 mg = 3 × 1000 mcg = 3000 mcg.

More convenient than applying the mg to mcg formula is our mass converter right below. Insert your mass in mg with a decimal point for fractions, our calculator then does the rest on the fly.

MG to MCG Converter

Change mg to mcg


If you hit the swap button, then our mg to ug conversion calculator changes to converting mcg to mg. BTW: Frequent milligram to microgram conversions on our website include, for example:

This article covers all about mcg to mg. In the paragraph ahead we are going to give you more information on milligrams to micrograms; particularly, we will explain mg to μg and mg to ug.

Milligrams to Micrograms

It is important to note that except mainly for the United States of America, milligrams to micrograms is often spelled as milligrammes to microgrammes.

Using the International System of Units (SI) symbols, mg to mcg would be written as mg to μg; μ is the lowercase Greek letter Mu denoting a factor of one millionth.

Yet, as people sometimes seem to have difficulties typing the letter μ, many times they resort to typing ug to mg in the search engine of their liking as the “u” looks like the “μ”.

One g (gram) is one thousandth of a kg (kilogram), and one mg is one thousandth of a gram. As one mcg is one millionth of a gram, it follows that a mcg is one billionth of a kg.

Other search terms visitors of our site are frequently looking for include, for instance, mcg per mg, convert mg to ug, how many micrograms in a milligram and mg vs mcg.

Next, in the concluding section of our article, we look at the frequently asked questions on the topic, go on explaining our custom search form, and the summarize convert mg into mcg.


By now, you certainly know mg in mcg inside out, but you might also be interested in learning about the FAQs about milligram to microgram, which include, but are not limited to:

  • How many mcg in a mg?
  • How many micrograms in a milligram?
  • How many mcg in mg?
  • How many micrograms are in a milligram?
  • How many micrograms in milligram?
  • How many micrograms equal a milligram?
  • How much mcg in mg?

Reading our information we are convinced that you can also answer mg in ug. Yet, for everything else about mcg in mg by fill in the comment form at the bottom.

You could also get in touch by email using the subject mg mcg. We really appreciate all feedback and promise to reply asap. Have a look at our mg to mcg conversion search form now.

Utilizing that form located either in the sidebar or at the bottom, you can find our mg to mcg conversions entering, for instance, x mg in mcg, supposed that x stands for you mass in mg.

Give it a try now, typing, x mg to mcg conversion, x milligram microgram, or x ug to mg conversion, just to name a few examples. The result lists all post related to x mg to ug.

More information on milligrams and micrograms can be found in the header articles. In summary:

mg to mcg

If you are pleased with our content, then hit the social buttons, and make sure to bookmark us as how to convert milligrams to micrograms or something alike.

Thanks for visiting our article about how to convert mg to mcg.

Search Conversions