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mg to mcg Converter — Milligrams & Micrograms
Convert mg to mcg or mcg to mg instantly. See the formula, worked examples, and a quick conversion table. Free, no signup.
How to convert mg to mcg
mcg = mg × 1,000
mg = mcg ÷ 1,000
A milligram is one thousandth of a gram; a microgram is one millionth. That makes 1 mg equal to 1,000 mcg. The symbol µg also means micrograms. Source: NIST: Metric prefixes.
Conversion examples
| Milligrams (mg) | Micrograms (mcg) |
|---|---|
| 0.1 | 100 |
| 0.25 | 250 |
| 1 | 1,000 |
| 5 | 5,000 |
Can mg be converted directly to mL?
No. Milligrams measure mass and millilitres measure volume. You need the solution concentration to connect the two. Use the concentration calculator below to calculate mass per millilitre.