Conversion Factor: 1 Milligram (mg) = 1000 Micrograms (mcg) | 1 Microgram (mcg) = 0.001 Milligrams (mg)

Milligram to Microgram Converter

Accurately convert between milligrams (mg) and micrograms (mcg) for medication doses, laboratory measurements, or supplement calculations. Default precision: 0 decimal places.

Currently converting: Milligrams (mg) → Micrograms (mcg)

Enter Value in Milligrams (mg)

Enter any non-negative number (e.g., 5, 0.25, 10.5)

Result in Micrograms (mcg)

mcg

Precision: 0 Decimal Places | Formula: mcg = mg × 1000

Common Conversion Table

Milligrams (mg)	Equals	Micrograms (mcg)
0.001 mg	=	1 mcg
0.01 mg	=	10 mcg
0.1 mg	=	100 mcg
0.25 mg	=	250 mcg
0.5 mg	=	500 mcg
1 mg	=	1,000 mcg
2 mg	=	2,000 mcg
5 mg	=	5,000 mcg
10 mg	=	10,000 mcg
25 mg	=	25,000 mcg
50 mg	=	50,000 mcg
100 mg	=	100,000 mcg
500 mg	=	500,000 mcg
1,000 mg	=	1,000,000 mcg

Micrograms to Milligrams Conversion Table

Micrograms (mcg)	Equals	Milligrams (mg)
1 mcg	=	0.001 mg
10 mcg	=	0.01 mg
100 mcg	=	0.1 mg
250 mcg	=	0.25 mg
500 mcg	=	0.5 mg
1,000 mcg	=	1 mg
5,000 mcg	=	5 mg
10,000 mcg	=	10 mg

Quick Conversion Shortcuts

Milligrams (mg) → Micrograms (mcg)

About Milligrams and Micrograms

Conversion Formulas

Milligrams to Micrograms

mcg = mg × 1000

Example: 2.5 mg × 1000 = 2500 mcg

Micrograms to Milligrams

mg = mcg ÷ 1000

Example: 3500 mcg ÷ 1000 = 3.5 mg

Unit Definitions

Milligram (mg)

A unit of mass equal to one thousandth of a gram (0.001 g) and one thousand micrograms (1000 mcg). Commonly used for medication dosages and small measurements.

Microgram (mcg)

A unit of mass equal to one millionth of a gram (0.000001 g) and one thousandth of a milligram (0.001 mg). Used for very small measurements like vitamin dosages.

Practical Examples

Medication Dosage

If a prescription calls for 0.75 mg of a medication, how many micrograms is that?

mcg = 0.75 mg × 1000

mcg = 750

Result: 0.75 mg equals 750 mcg

Vitamin Supplement

A vitamin label lists 5000 mcg of B12. What is this measurement in milligrams?

mg = 5000 mcg ÷ 1000

mg = 5

Result: 5000 mcg equals 5 mg

Frequently Asked Questions

There are 1000 micrograms (mcg) in one milligram (mg). This means 1 mg = 1000 mcg. This conversion factor is consistent because "micro-" means one millionth, while "milli-" means one thousandth, making a milligram 1000 times larger than a microgram.

Both are metric units of mass, but they differ significantly in scale:

mg (milligram): 1 mg = 0.001 grams
mcg (microgram): 1 mcg = 0.000001 grams
1 mg = 1000 mcg (so a microgram is 1000 times smaller than a milligram)

This difference is crucial in medical settings, as confusing these units can result in dangerous medication errors.

"µg" (with the Greek letter mu) and "mcg" are identical in meaning. "µg" is the scientific symbol where "µ" represents "micro-", while "mcg" is a common alternative used in consumer products because the "µ" symbol can be difficult to read or type on some devices. Both represent micrograms, so 500 µg = 500 mcg.

Common situations requiring conversion between mg and mcg include:

Reading medication labels and prescriptions
Measuring vitamin and supplement dosages
Laboratory work and scientific measurements
Preparing solutions with precise concentrations
Comparing product specifications across different units
Adjusting dosages for children or pets based on weight

To convert 0.5 mg to micrograms, use the conversion formula:

mcg = mg × 1000

mcg = 0.5 × 1000

mcg = 500

Therefore, 0.5 mg equals 500 mcg. This is a common conversion for medications and supplements that require precise dosing.

To convert 2500 micrograms to milligrams, use the conversion formula:

mg = mcg ÷ 1000

mg = 2500 ÷ 1000

mg = 2.5

Therefore, 2500 mcg equals 2.5 mg. This conversion is useful when dealing with larger microgram measurements that are easier to understand in milligrams.

Precision is critical when converting between milligrams and micrograms because these units are used for measurements where small differences matter, especially:

Medication dosing: A difference of just 0.1 mg equals 100 mcg, which could be an underdose or overdose
Laboratory work: Scientific experiments require precise measurements for accurate results
Supplement administration: Many vitamins and minerals have narrow therapeutic ranges
Medical testing: Blood tests and other diagnostic measurements often use mcg for trace elements

For example, a 0.025 mg difference in a medication dose equals 25 mcg, which could be significant for certain drugs.

Different items are typically measured in milligrams versus micrograms based on their typical quantities:

Commonly measured in mg:

Most prescription medications
Over-the-counter pain relievers (e.g., 200 mg ibuprofen)
Calcium and magnesium supplements
Caffeine in beverages (e.g., 50 mg per cup)
Small quantities of spices in cooking

Commonly measured in mcg:

Vitamin B12 (e.g., 1000 mcg supplements)
Vitamin D (e.g., 1000 mcg daily dose)
Trace minerals like iodine and selenium
Thyroid medications (e.g., 125 mcg levothyroxine)
Certain hormones in blood tests

Converting milligrams to micrograms for a child's medication follows the same formula as for adults (mcg = mg × 1000), but with extra care:

Check the prescription for the exact dosage (e.g., 0.25 mg)
Apply the conversion: 0.25 mg × 1000 = 250 mcg
Verify with the medication's concentration (e.g., "500 mcg per mL")
Calculate the volume needed: 250 mcg ÷ 500 mcg/mL = 0.5 mL
Always double-check with a pharmacist or doctor

Important: Never guess a child's medication dosage. Always confirm conversions with a healthcare professional to avoid dangerous errors.

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Milligram to Microgram Converter

Calculation Details

Recent Conversions

Common Conversion Table

Micrograms to Milligrams Conversion Table

Quick Conversion Shortcuts

Milligrams (mg) → Micrograms (mcg)

About Milligrams and Micrograms

Conversion Formulas

Unit Definitions

Milligram (mg)

Microgram (mcg)

Practical Examples

Medication Dosage

Vitamin Supplement

Frequently Asked Questions

Commonly measured in mg:

Commonly measured in mcg:

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