mg to mcg converter
Type in either box. 1 mg equals 1,000 mcg.
1 mg = 1,000 mcg
How do you convert mg to mcg?
Multiply mg by 1,000 to get mcg: 0.25 mg is 250 mcg.
A milligram (mg) is one thousandth of a gram and a microgram (mcg) is one millionth, so every mg holds 1,000 mcg.
mg to mcg conversion chart
| mg | mcg |
|---|---|
| 0.01 | 10 |
| 0.05 | 50 |
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 2.5 | 2,500 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
How do you convert mcg to mg?
Divide mcg by 1,000 to get mg: 500 mcg is 0.5 mg.
Dividing by 1,000 is the same as moving the decimal point three places to the left. For example, 1,500 mcg becomes 1.5 mg, and 50 mcg becomes 0.05 mg.
| mcg | mg |
|---|---|
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 750 | 0.75 |
| 1,000 | 1 |
| 1,500 | 1.5 |
| 2,000 | 2 |
| 5,000 | 5 |
A quick way to check your answer
The same amount always has a bigger number in mcg than in mg, because a microgram is so much smaller.
- mg to mcg: the number should get 1,000 times bigger. 2 mg is 2,000 mcg.
- mcg to mg: the number should get 1,000 times smaller. 750 mcg is 0.75 mg.
- If your answer went the other way, you multiplied when you should have divided, or the reverse.
Why does mg to mcg matter when you mix a vial?
Vials are usually labeled in mg while small doses are often written in mcg, so the two have to be in the same unit before you divide. Leaving one in mg makes every later number 1,000 times off.
For example, a 5 mg vial mixed with 2 mL of water holds 5,000 mcg ÷ 2 mL = 2,500 mcg per mL. If you forget to convert, it looks like 2.5 per mL, and a 250 mcg dose would seem to need far more liquid than it really does.
The peptide calculator lets you enter either unit for the vial and the dose and converts for you. Reconstitution math explained walks through every step.
Other units you might see
- Grams (g): 1 g = 1,000 mg = 1,000,000 mcg.
- Micrograms written as µg: µg and mcg mean the same thing.
- International units (IU): IU measure an effect, not a weight, so there is no single IU to mg conversion. The factor is different for every substance, and only its label or a pharmacist can give it.
Frequently asked questions
How many mcg are in 1 mg?
There are 1,000 mcg in 1 mg. To convert mg to mcg, multiply by 1,000.
How do I convert mcg to mg?
Divide by 1,000. For example, 250 mcg is 0.25 mg, and 1,500 mcg is 1.5 mg.
Is mcg the same as µg?
Yes. mcg and µg both mean microgram, one millionth of a gram. mcg is used on labels because the µ symbol can be misread as "m".
Why does mixing up mg and mcg matter?
An mg is 1,000 times bigger than an mcg. Reading 0.25 mg as 0.25 mcg gives an amount 1,000 times too small, so always check the unit on the label and in the calculator.