mg to mcg – Milligrams to Micrograms

Convert milligrams to micrograms and other weight units. 1 mg = 1,000 mcg.

Milligrams (mg)

About This Calculator

Convert milligrams to micrograms and other weight units. 1 mg = 1,000 mcg. Use the calculator above for instant results.

Worked Examples

Example 1: 5 mg

5 × 1,000 = 5,000 mcg

Answer: 5,000 mcg

Example 2: 0.1 mg

0.1 × 1,000 = 100 mcg

Answer: 100 mcg

Example 3: Vitamin D 1000 IU ≈ 25 mcg = 0.025 mg

0.025 mg = 25 mcg

Answer: 0.025 mg = 25 mcg

Who Uses This Calculator?

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Patients

Convert medication dosages.

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Pharmacists

Drug measurement conversion.

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Students

Chemistry measurement units.

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Nutritionists

Convert supplement dosages.

Common Mistakes to Avoid

❌ mg vs mcg dose errors

This is a critical medical safety issue. A 10x or 100x dosage error can be life-threatening. Always double-check units with a pharmacist.

❌ IU vs mg/mcg

International Units (IU) vary by substance — not a universal conversion. 1000 IU vitamin D = ~25 mcg, but 1000 IU vitamin A = different amount.

Frequently Asked Questions

mg to mcg conversion?

Multiply by 1,000. 1 mg = 1,000 mcg (μg).

mcg to mg?

Divide by 1,000. 500 mcg = 0.5 mg.

Common supplement dosages?

Vitamin D: 1,000-5,000 IU = 25-125 mcg. Vitamin B12: 1,000 mcg = 1 mg. Iron: 18-27 mg. Zinc: 8-11 mg.