In 1 grams there are 1,000,000 micrograms. Meanwhile in 1 micrograms there are 0.00000100000 grams. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Micrograms to Grams calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert grams (g) to micrograms (µg), use this metric rule:
Formula:
Quick examples:
This grams to micrograms conversion is common when reporting very small amounts, like trace levels of pollutants in environmental samples.
There are 1,000,000 micrograms (mcg) in 1 gram (g). Micro means one-millionth of a gram, so the number gets much larger in micrograms.
Multiply the grams value by 1,000,000.
Formula: micrograms = grams × 1,000,000
The conversion factor from grams to micrograms is:
1 g = 1,000,000 mcg
Divide the micrograms value by 1,000,000.
Formula: grams = micrograms ÷ 1,000,000
Yes. mcg and µg both mean microgram. Many labels use mcg because it avoids confusion if the µ symbol is hard to read.
Micrograms are a much smaller unit than grams. When you express the same amount in a smaller unit, the number increases. That’s why 0.001 g becomes 1,000 mcg.
Here are quick examples people use often:
0.25 g = 250,000 mcg
You get this by multiplying 0.25 by 1,000,000.
0.01 g = 10,000 mcg
That’s one-hundredth of a gram written in micrograms.
0.001 g = 1,000 mcg
This is a common dose size on nutrition labels and supplements.
Yes. Many vitamins, minerals, and medicines use micrograms (mcg) because doses can be very small. Always double-check the unit so you don’t mix up mg and mcg.
This matters because 1 mg is much larger than 1 mcg.
Write the unit next to every number and use the full conversion:
A quick check helps: the micrograms number should be much larger than the grams number.
Yes. Both grams and micrograms are part of the metric system. They measure mass, often used for food, lab work, and dosing.
You can, but rounding can change small amounts a lot. If the amount is used for dosing or lab results, keep more decimal places in grams or keep the result in whole micrograms when possible.
“Micro” means one-millionth. A microgram is 0.000001 grams. This is why converting from grams to micrograms multiplies by one million.
The Calculate Box tool to convert grams to micrograms uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a grams value in the box and have it instantly converted to micrograms.