Milligram [mg] to Microgram [mcg] Converter

Quick Reference

1 Milligram (mg) = 1000 Microgram (mcg)

1 Microgram (mcg) = 0.001 Milligram (mg)

How to Convert Milligram to Microgram

1 mg = 1000.0000000000001 mcg
1 mcg = 0.001 mg

To convert Milligram to Microgram, multiply the value by 1000. To convert Microgram back to Milligram, divide by 1000.

Example: convert 10 mg to mcg:
10 mg = 10 x 1000.0000000000001 = 10000.000000000002 mcg

↔ Convert Microgram to Milligram

Milligram

Definition: A milligram (symbol: mg) is a unit of mass in the metric system. It is defined as one thousandth (1/1000) of a gram.

History/origin: The milligram is derived from the gram, the base unit of mass in the metric system. The metric system originated in France in the late 18th century. The prefix 'milli-' denotes a factor of 1/1000.

Current use: Milligrams are commonly used for measuring small quantities of substances, such as pharmaceutical drugs, vitamins, and food additives. It is also used in scientific research and analysis.

Microgram

Definition: A microgram (mcg or µg) is a unit of mass in the metric system, equal to one millionth (10⁻⁶) of a gram.

History/origin: The microgram is derived from the gram, which was defined during the French Revolution as the mass of one cubic centimeter of water at the temperature of melting ice. The prefix 'micro-' indicates one millionth.

Current use: Micrograms are commonly used to measure very small amounts of substances, such as vitamins, medications, and pollutants. They are frequently used in pharmaceuticals, biochemistry, and environmental science.

Milligram to Microgram Conversion Table

Milligram [mg]	Microgram [mcg]
1 mg	1000.0000000000001 mcg
2 mg	2000.0000000000002 mcg
5 mg	5000 mcg
10 mg	10000 mcg
20 mg	20000 mcg
50 mg	50000.00000000001 mcg
100 mg	100000.00000000001 mcg
200 mg	200000.00000000003 mcg
500 mg	500000 mcg
1000 mg	1000000 mcg

Common pairs of Mass

Microgram

Microgram to Milligram Microgram to Gram Microgram to Kilogram Microgram to Metric Tonne Microgram to Ounce

Milligram

Milligram to Microgram Milligram to Gram Milligram to Kilogram Milligram to Metric Tonne Milligram to Ounce

Gram

Gram to Microgram Gram to Milligram Gram to Kilogram Gram to Metric Tonne Gram to Ounce

Kilogram

Kilogram to Microgram Kilogram to Milligram Kilogram to Gram Kilogram to Metric Tonne Kilogram to Ounce

Metric Tonne

Metric Tonne to Microgram Metric Tonne to Milligram Metric Tonne to Gram Metric Tonne to Kilogram Metric Tonne to Ounce

Ounce

Ounce to Microgram Ounce to Milligram Ounce to Gram Ounce to Kilogram Ounce to Metric Tonne

Pound

Pound to Microgram Pound to Milligram Pound to Gram Pound to Kilogram Pound to Metric Tonne

Ton

Ton to Microgram Ton to Milligram Ton to Gram Ton to Kilogram Ton to Metric Tonne

Milligram [mg] to Microgram [mcg] Converter

To convert Milligram to Microgram, enter your value in the mg field above and the result in mcg will appear instantly. You can also use the conversion factor shown in the table on this page to calculate manually. The formula is always the same: multiply your mg value by the fixed conversion ratio to get the equivalent in mcg.

Our Milligram to Microgram converter uses standardized conversion factors defined by international scientific and metrological organizations. All calculations are performed with full floating-point precision. You can also choose how many decimal places to display in the result, so you get exactly the level of detail you need.

Yes, absolutely. Simply swap the source and destination units in the converter — select mcg as your input unit and mg as your output unit. The same precision and standardized conversion factor applies in both directions.

Converting between Milligram and Microgram comes up regularly in engineering, scientific research, construction, and everyday tasks that involve measurements from different unit systems. Our converter eliminates the risk of manual calculation errors and saves time whenever you need to switch between these two units.

Yes, the Milligram to Microgram converter is completely free. No account or registration is required, and there are no usage limits. It works on any device — smartphones, tablets, and desktop computers — directly in your browser.

Milligram and Microgram are both units used to measure the same physical quantity, but they belong to different measurement systems or represent different scales. The mathematical relationship between them is fixed and constant, which is what makes accurate conversion possible. Scroll up to see the exact conversion factor, formula, and a reference table for common values.

Milligram [mg] to Microgram [mcg] Converter

Quick Reference

1 Milligram (mg) = 1000 Microgram (mcg)

1 Microgram (mcg) = 0.001 Milligram (mg)

How to Convert Milligram to Microgram

1 mg = 1000.0000000000001 mcg
1 mcg = 0.001 mg

To convert Milligram to Microgram, multiply the value by 1000. To convert Microgram back to Milligram, divide by 1000.

Example: convert 10 mg to mcg:
10 mg = 10 x 1000.0000000000001 = 10000.000000000002 mcg

↔ Convert Microgram to Milligram

Milligram

Definition: A milligram (symbol: mg) is a unit of mass in the metric system. It is defined as one thousandth (1/1000) of a gram.

Microgram

Definition: A microgram (mcg or µg) is a unit of mass in the metric system, equal to one millionth (10⁻⁶) of a gram.

Milligram to Microgram Conversion Table

Milligram [mg]	Microgram [mcg]
1 mg	1000.0000000000001 mcg
2 mg	2000.0000000000002 mcg
5 mg	5000 mcg
10 mg	10000 mcg
20 mg	20000 mcg
50 mg	50000.00000000001 mcg
100 mg	100000.00000000001 mcg
200 mg	200000.00000000003 mcg
500 mg	500000 mcg
1000 mg	1000000 mcg

Common pairs of Mass

Microgram

Microgram to Milligram Microgram to Gram Microgram to Kilogram Microgram to Metric Tonne Microgram to Ounce

Milligram

Milligram to Microgram Milligram to Gram Milligram to Kilogram Milligram to Metric Tonne Milligram to Ounce

Gram

Gram to Microgram Gram to Milligram Gram to Kilogram Gram to Metric Tonne Gram to Ounce

Kilogram

Kilogram to Microgram Kilogram to Milligram Kilogram to Gram Kilogram to Metric Tonne Kilogram to Ounce

Metric Tonne

Metric Tonne to Microgram Metric Tonne to Milligram Metric Tonne to Gram Metric Tonne to Kilogram Metric Tonne to Ounce

Ounce

Ounce to Microgram Ounce to Milligram Ounce to Gram Ounce to Kilogram Ounce to Metric Tonne

Pound

Pound to Microgram Pound to Milligram Pound to Gram Pound to Kilogram Pound to Metric Tonne

Ton

Ton to Microgram Ton to Milligram Ton to Gram Ton to Kilogram Ton to Metric Tonne