/convert/micrograms-to-milligrams/ Convert micrograms (μg) to milligrams (mg) instantly. Includes a reference table and formula. article micrograms (μg) to milligrams (mg) Converter — 247QuickTools ,{ "@context": "https://schema.org", "@type": "SpeakableSpecification", "cssSelector": [".tool-intro", ".info-gain-section"] }
⚖️ Weight & Mass

micrograms (μg) to milligrams (mg) Converter

Convert micrograms (μg) to milligrams (mg) instantly. Includes a reference table and formula.

Quick answer: To convert micrograms (μg) to milligrams (mg), multiply by 0.001. For example, 1 micrograms (μg) = 0.001 milligrams (mg). Use the calculator below for any value.
micrograms (μg) to milligrams (mg)
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Common conversions
micrograms (μg) milligrams (mg)
Formula:

How to convert micrograms (μg) to milligrams (mg)

1

Enter your value

Type the number of micrograms (μg) you want to convert into the left box. The result in milligrams (mg) appears instantly in the right box. You can also type into the right box to convert in the other direction.

2

Use the swap button

Click the ⇄ Swap button to reverse the conversion — milligrams (mg) to micrograms (μg). Your current value carries across so you don't have to re-enter anything.

3

About micrograms (μg) and milligrams (mg)

micrograms (μg) and milligrams (mg) are both weight and mass. Use this converter to switch between them instantly.

💡 Did you know?

1 mg = 1,000 mcg (µg). The mcg unit is used for vitamins (Vitamin D: 10 mcg/400 IU), thyroid medication (Levothyroxine: 25-200 mcg), and food nutrients. A 400 mcg folic acid supplement = 0.4 mg. The difference between 400 mcg and 400 mg is 1,000-fold — always specify the unit.

📊 Common conversions at a glance
micrograms (μg) milligrams (mg)
100 0.1
250 0.25
500 0.5
1000 1
2000 2
5000 5
Reviewed for 2026. micrograms (μg) ↔ milligrams (mg) conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.