Milligram to Microgram Converter
Enter the value that you want to convert milligram (mg) to microgram (µg) or microgram to milligram.Also written as MG to ΜG conversion.
1 milligram = 1000.0000000 microgram
Formula: microgram = milligram value × 1000.0000000
MG to ΜG — milligram to microgram
10 milligram = 10000.00000 microgram
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Converting Milligram to Microgram
What is Milligram?
Milligram (mg) is a unit of weight measurement. 1 milligram is equal to 1000.0000000 microgram.
The Microgram Explained
Microgram (µg) is a unit of weight measurement. 1 microgram is equal to 0.0010000 milligram.
Understanding Weight Conversions
Weight unit conversions are among the most frequently performed in daily life. International commerce ships in metric tonnes and kilograms, while US domestic logistics uses pounds and ounces. Recipes from different countries use different systems — a European cake recipe in grams versus an American one in cups and ounces. Pharmacists convert between milligrams and grains for medication dosing. Athletes track body weight across metric and imperial systems depending on their country and sport federation requirements.
milligram to microgram metric conversion table
| 0.01 mg | = | 10.00000 µg |
| 0.1 mg | = | 100.00000 µg |
| 1 mg | = | 1000.00000 µg |
| 2 mg | = | 2000.00000 µg |
| 3 mg | = | 3000.00000 µg |
| 4 mg | = | 4000.00000 µg |
| 5 mg | = | 5000.00000 µg |
| 6 mg | = | 6000.00000 µg |
| 7 mg | = | 7000.00000 µg |
| 8 mg | = | 8000.00000 µg |
| 9 mg | = | 9000.00000 µg |
| 10 mg | = | 10000.00000 µg |
| 11 mg | = | 11000.00000 µg |
| 12 mg | = | 12000.00000 µg |
| 13 mg | = | 13000.00000 µg |
| 14 mg | = | 14000.00000 µg |
| 15 mg | = | 15000.00000 µg |
| 16 mg | = | 16000.00000 µg |
| 17 mg | = | 17000.00000 µg |
| 18 mg | = | 18000.00000 µg |
| 19 mg | = | 19000.00000 µg |
| 20 mg | = | 20000.00000 µg |
| 30 mg | = | 30000.00000 µg |
| 40 mg | = | 40000.00000 µg |
| 50 mg | = | 50000.00000 µg |
| 60 mg | = | 60000.00000 µg |
| 70 mg | = | 70000.00000 µg |
| 80 mg | = | 80000.00000 µg |
| 90 mg | = | 90000.00000 µg |
| 100 mg | = | 100000.00000 µg |
| 200 mg | = | 200000.00000 µg |
| 300 mg | = | 300000.00000 µg |
| 400 mg | = | 400000.00000 µg |
| 500 mg | = | 500000.00000 µg |
| 600 mg | = | 600000.00000 µg |
| 700 mg | = | 700000.00000 µg |
| 800 mg | = | 800000.00000 µg |
| 900 mg | = | 900000.00000 µg |
| 1000 mg | = | 1000000.00000 µg |
How to Convert MG to ΜG (Milligram to Microgram)?
We can convert milligram to microgram by using an example.
Example:
Convert 20 Milligram to Microgram?
We know 1 Milligram = 1000.0000000 microgram; 1 Microgram = 0.0010000 milligram.
20 milligram = ___µg
20 × 1000.0000000 = 20000.00000 µg (we know 1 milligram = 1000.0000000 microgram)
Answer:
20 milligram = 20000.00000 microgram
How to Convert Milligrams to Micrograms (Step-by-Step)
Converting milligrams to micrograms is critical in medical dosing, especially for potent drugs where mg vs mcg confusion has caused patient deaths. The conversion is 1 mg = 1000 micrograms (mcg or μg).
- Identify the dose in milligrams (mg) to convert.
- Multiply the mg value by 1000 to get micrograms.
- Alternatively, move the decimal point 3 places to the right.
- CRITICAL: always verify the unit — mg/mcg confusion is a top cause of medication errors.
Common mg to Microgram Conversions (Medical Dosing)
Medications commonly dosed in both mg and mcg — understanding the relationship prevents potentially fatal dosing errors.
| Milligram | Microgram |
|---|---|
| 0.025 mg | 25 mcg |
| 0.05 mg | 50 mcg |
| 0.1 mg | 100 mcg |
| 0.2 mg | 200 mcg |
| 0.4 mg | 400 mcg |
| 0.5 mg | 500 mcg |
| 1 mg | 1000 mcg |
| 5 mg | 5000 mcg |
Solved Examples: mg to Micrograms
Question 1: A thyroid prescription reads "0.125 mg levothyroxine." The pharmacy stocks 25 mcg and 50 mcg tablets. What combination works?
Solution:
Convert to mcg: 0.125 × 1000 = 125 mcg
Options: one 50 mcg + one 25 mcg = 75 mcg (wrong)
Or: two 50 mcg + one 25 mcg = 125 mcg ✓
Answer: 0.125 mg = 125 mcg. Dispense two 50 mcg tablets + one 25 mcg tablet.
Question 2: A fentanyl patch delivers 0.075 mg/hour. Express the delivery rate in mcg/hour.
Solution:
mcg/hour = 0.075 × 1000
= 75 mcg/hour
Answer: 0.075 mg/hr = 75 mcg/hr fentanyl delivery rate.
Question 3: A prenatal vitamin contains 0.8 mg of folate. Express in mcg. Is this the recommended 400 mcg?
Solution:
mcg = 0.8 × 1000 = 800 mcg
Compare with recommendation: 800 > 400
Answer: 0.8 mg = 800 mcg — twice the minimum recommended 400 mcg.
Question 4: A medication error report shows "500 mg given instead of 500 mcg." What fold overdose occurred?
Solution:
500 mg in mcg = 500 × 1000 = 500,000 mcg
Intended dose: 500 mcg
Overdose factor: 500,000 ÷ 500 = 1000×
Answer: A 1000-fold overdose — exactly why mg/mcg confusion is classified as a "never event" in healthcare.
Practice Questions: mg to Micrograms
Try solving these on your own to test your understanding:
- Convert 0.3 mg to mcg. (Answer: 300 mcg)
- A dose is 0.015 mg. Express in micrograms. (Answer: 15 mcg)
- Convert 2.5 mg to mcg. (Answer: 2,500 mcg)
- A vitamin label says 0.002 mg selenium. How many mcg? (Answer: 2 mcg)
- Convert 0.75 mg to micrograms. (Answer: 750 mcg)
Patient Safety: Why mg/mcg Confusion Kills
The ISMP lists mg/mcg confusion among the most dangerous medication errors. Real cases: colchicine 0.5 mg prescribed, 0.5 mg given (correct) vs 500 mcg written unclearly and 500 mg dispensed → fatal. Fentanyl, digoxin, and levothyroxine are especially dangerous because they're dosed in mcg but packaged near mg-dose medications. FDA now requires tall-man lettering (mcg vs mg) and prohibits the "μg" abbreviation on prescriptions.
Vitamins and Supplements: The mcg Revolution
Supplement labels are shifting from mg to mcg for small doses: Vitamin D (formerly "0.01 mg" now "10 mcg" or "400 IU"), Vitamin B12 ("0.5 mg" now "500 mcg"), Selenium ("0.055 mg" now "55 mcg"), Chromium ("0.2 mg" now "200 mcg"). This change makes doses more intuitive — "200 mcg" is clearer than "0.2 mg" for consumers comparing products on store shelves.
International Units (IU) vs Micrograms: The Vitamin D Example
Some vitamins use IU (International Units) alongside mcg. Vitamin D: 1 mcg = 40 IU. So 10 mcg = 400 IU, 25 mcg = 1000 IU, 50 mcg = 2000 IU. Vitamin A: 1 mcg RAE = 3.33 IU. These conversion factors are substance-specific — you cannot use IU-to-mcg conversion for one vitamin and apply it to another. Always check the specific vitamin's equivalence factor.
Key Takeaways
- Multiply mg by 1000 to get micrograms (mcg/μg).
- NEVER abbreviate microgram as "μg" in handwriting — write "mcg" or spell it out.
- mg/mcg confusion causes 1000× dosing errors — classified as a "never event."
- Levothyroxine, fentanyl, and digoxin: always verify mg vs mcg on prescriptions.
- Supplement labels increasingly use mcg for clarity (500 mcg instead of 0.5 mg).
- Vitamin D: 1 mcg = 40 IU (substance-specific, not universal).
Milligram to Microgram Conversion Formula
microgram = milligram × 1000.0000000
1 milligram = 1000.0000000 microgram
1 microgram = 0.0010000 milligram
Reverse: milligram = microgram × 0.0010000
Frequently Asked Questions
How many microgram are in 1 milligram?
There are 1000.0000000 microgram in 1 milligram. To convert milligram to microgram, multiply the value by 1000.0000000.
How do I convert milligram to microgram?
Multiply your milligram value by 1000.0000000 to get the equivalent in microgram. For example, 5 milligram = 5 × 1000.0000000 = 5000.00000 microgram.
How do I convert microgram to milligram?
Multiply your microgram value by 0.0010000 to get the equivalent in milligram. Alternatively, divide by 1000.0000000.
What is 10 milligram in microgram?
10 milligram is equal to 10000.00000 microgram.
What is 100 milligram in microgram?
100 milligram is equal to 100000.00000 microgram.