MG to MCG Converter
Type a value in milligrams to see it in micrograms as you type, with the exact formula and a reference chart.
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How this was calculated
- 1 milligram = 1,000 micrograms
- 0.5 × 1,000 = 500 mcg
| mg | mcg |
|---|---|
| 0.025 mg | 25 mcg |
| 0.05 mg | 50 mcg |
| 0.075 mg | 75 mcg |
| 0.1 mg | 100 mcg |
| 0.125 mg | 125 mcg |
| 0.15 mg | 150 mcg |
| 0.2 mg | 200 mcg |
| 0.25 mg | 250 mcg |
| 0.3 mg | 300 mcg |
| 0.4 mg | 400 mcg |
| 0.5 mg | 500 mcg |
| 0.75 mg | 750 mcg |
| 1 mg | 1,000 mcg |
| 1.5 mg | 1,500 mcg |
| 2 mg | 2,000 mcg |
| 2.5 mg | 2,500 mcg |
| 5 mg | 5,000 mcg |
| 10 mg | 10,000 mcg |
| 25 mg | 25,000 mcg |
| 50 mg | 50,000 mcg |
| 100 mg | 100,000 mcg |
| mcg | mg |
|---|---|
| 1 mcg | 0.001 mg |
| 5 mcg | 0.005 mg |
| 10 mcg | 0.01 mg |
| 15 mcg | 0.015 mg |
| 20 mcg | 0.02 mg |
| 25 mcg | 0.025 mg |
| 50 mcg | 0.05 mg |
| 100 mcg | 0.1 mg |
| 150 mcg | 0.15 mg |
| 200 mcg | 0.2 mg |
| 250 mcg | 0.25 mg |
| 300 mcg | 0.3 mg |
How to convert milligrams to micrograms
1 milligram = 1,000 micrograms. To convert milligrams to micrograms, multiply by 1,000. A milligram is one thousandth of a gram. A microgram (mcg or µg) is one millionth of a gram, one thousandth of a milligram.
Worked examples
- 0.1 milligrams = 100 mcg (0.1 × 1,000)
- 0.5 milligrams = 500 mcg (0.5 × 1,000)
- 2.5 milligrams = 2,500 mcg (2.5 × 1,000)
Where this conversion comes up
Milligrams are used for medicine doses, vitamins, caffeine and sodium on labels; micrograms for vitamin D, B12, folate and thyroid medication doses. Multiply by 1,000: 0.1 mg is 100 mcg and 2.5 mg is 2,500 mcg. Thyroid medication (levothyroxine) is dosed in mcg, so 0.075 mg is the 75 mcg tablet.
Quick estimate
Move the decimal point three places right.
Common mistakes
- Dividing instead of multiplying. A microgram is smaller than a milligram, so the number of micrograms must come out larger: 0.1 milligrams = 100 mcg.
Going the other way? Use the mcg to mg converter. Related weight converters: grams to ounces, oz to grams, oz to lbs, lbs to oz, grams to pounds, pounds to grams.
Frequently asked questions
How do you convert milligrams to micrograms?
Multiply the milligrams by 1,000. For example, 0.5 milligrams is 500 micrograms.
How many micrograms are in one milligram?
One milligram is 1,000 micrograms. A milligram is one thousandth of a gram.
What is 2.5 milligrams in micrograms?
2.5 milligrams is 2,500 micrograms.
Is there a quick way to estimate milligrams to micrograms?
Move the decimal point three places right.