Grams to Micrograms
Convert grams to micrograms instantly — one gram is 1e+06 micrograms.
| Grams | Micrograms |
|---|---|
| 1 g | 1000000 µg |
| 2 g | 2000000 µg |
| 3 g | 3000000 µg |
| 5 g | 5000000 µg |
| 10 g | 10000000 µg |
| 25 g | 25000000 µg |
| 50 g | 50000000 µg |
| 100 g | 100000000 µg |
How to use
- Enter a value in the Grams field.
- The Micrograms figure appears immediately — no button to press.
- Typing in the Micrograms field converts back to Grams the same way.
- Use the reference table for the values that come up most often.
Grams to Micrograms formula
To convert grams to micrograms, multiply by 1000000.
µg = g × 1000000
Why this factor: the gram and the microgram are both defined against the kilogram, so dividing one definition by the other gives 1000000 directly. Both definitions are set out in full below.
To go the other way, divide by 1000000 — or use the Micrograms to Grams converter, which is the same calculation reversed.
Worked example
Take 2 g and multiply by the factor 1000000: the result is 2000000 µg.
2 g × 1000000 = 2000000 µg
The converter above does this for any value you type, in either direction.
What is a gram?
A gram is one thousandth of a kilogram, the everyday unit for food and small-object mass.
Definition: Exactly 0.001 kilogram by SI prefix definition.
Where it is used: Nutrition labels, recipes, postal rates, and laboratory weighing.
What is a microgram?
A microgram is one millionth of a gram, used where quantities are vanishingly small but still matter.
Definition: Exactly 1×10⁻⁹ kilogram by SI prefix definition. Symbol µg.
Where it is used: Trace nutrients such as vitamin B12 and folate, hormone doses, and air-quality measurements.
Worth knowing: Sometimes abbreviated 'mcg' on labels specifically to avoid µg being misread as mg — a thousandfold dosing error.
Grams vs Micrograms
The gram and the microgram belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many micrograms are in a gram?
One gram equals 1000000 micrograms.
What is the formula to convert grams to micrograms?
Multiply the number of grams by 1000000. To reverse it, divide by 1000000 instead.
How do I convert micrograms back to grams?
Divide by 1000000, which is the same as multiplying by 1e-06.
How many micrograms are in 10 grams?
10 g works out to 10000000 µg.
Is there anything to watch out for with micrograms?
Sometimes abbreviated 'mcg' on labels specifically to avoid µg being misread as mg — a thousandfold dosing error.
How is the gram defined?
Exactly 0.001 kilogram by SI prefix definition.