This converter turns milligrams into micrograms instantly, using the exact factor 1 milligram = 1000 micrograms. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
One thousandth of a gram, the standard unit for medication doses and nutrients. One millionth of a gram, used for vitamins, hormones and trace analysis.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
milligrams- The amount you are converting, measured in milligrams
1000- The exact number of micrograms in one milligram
micrograms- The converted result
How it works, step by step
- Enter the number of milligrams you want to convert.
- The value is multiplied by 1000, the exact conversion factor.
- The result is displayed in micrograms, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 milligrams
Multiply 5 by 1000. That gives 5,000 micrograms. A quick sanity check: one milligram is larger than one microgram, so the number should get bigger — and it does.
Converting 72 milligrams
72 × 1000 = 72,000 micrograms. Working backwards, 72,000 ÷ 1000 returns 72 milligrams, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many micrograms are in one milligram?
Exactly 1000. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert milligrams to micrograms?
Micrograms = milligrams × 1000. To reverse it, divide instead: milligrams = micrograms ÷ 1000, which is the same as multiplying by 0.001.
Is the milligram bigger than the microgram?
Yes. One milligram equals 1000 micrograms, so it is the larger unit.
Why does my answer differ slightly from other mg to micrograms converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a milligram?
One thousandth of a gram, the standard unit for medication doses and nutrients.
What is a microgram?
One millionth of a gram, used for vitamins, hormones and trace analysis.
Milligrams to micrograms reference table
| Milligrams | Micrograms |
|---|---|
| 0.5 mg | 500 µg |
| 1 mg | 1000 µg |
| 2 mg | 2,000 µg |
| 3 mg | 3,000 µg |
| 5 mg | 5,000 µg |
| 10 mg | 10,000 µg |
| 15 mg | 15,000 µg |
| 20 mg | 20,000 µg |
| 25 mg | 25,000 µg |
| 50 mg | 50,000 µg |
| 75 mg | 75,000 µg |
| 100 mg | 100,000 µg |
| 250 mg | 250,000 µg |
| 500 mg | 500,000 µg |
| 1000 mg | 1,000,000 µg |
Exact factor: 1 milligram = 1000 micrograms. Values rounded for display.