Gram [g] to Milligram [mg] Converter

Quick Reference

1 Gram (g) = 1000 Milligram (mg)

1 Milligram (mg) = 0.001 Gram (g)

How to Convert Gram to Milligram

1 g = 1000 mg
1 mg = 0.001 g

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

Example: convert 10 g to mg:
10 g = 10 x 1000 = 10000 mg

↔ Convert Milligram to Gram

Gram

Definition: A gram (symbol: g) is a unit of mass in the metric system. It was originally defined as the mass of one cubic centimeter of pure water at the temperature of maximum density.

History/origin: The gram is the base unit of mass in the metric system, which was established in France in the late 18th century. It was intended to be a universal and rational system of measurement.

Current use: Grams are widely used for measuring the mass of food items, ingredients, and small objects. It's a standard unit in cooking, chemistry, and various industries.

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.

Gram to Milligram Conversion Table

Gram [g]	Milligram [mg]
1 g	1000 mg
2 g	2000 mg
5 g	5000 mg
10 g	10000 mg
20 g	20000 mg
50 g	50000 mg
100 g	100000 mg
200 g	200000 mg
500 g	500000 mg
1000 g	1000000 mg

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

Gram [g] to Milligram [mg] Converter

To convert Gram to Milligram, enter your value in the g field above and the result in mg 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 g value by the fixed conversion ratio to get the equivalent in mg.

Our Gram to Milligram 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 mg as your input unit and g as your output unit. The same precision and standardized conversion factor applies in both directions.

Converting between Gram and Milligram 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 Gram to Milligram 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.

Gram and Milligram 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.

Gram [g] to Milligram [mg] Converter

Quick Reference

1 Gram (g) = 1000 Milligram (mg)

1 Milligram (mg) = 0.001 Gram (g)

How to Convert Gram to Milligram

1 g = 1000 mg
1 mg = 0.001 g

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

Example: convert 10 g to mg:
10 g = 10 x 1000 = 10000 mg

↔ Convert Milligram to Gram

Gram

Definition: A gram (symbol: g) is a unit of mass in the metric system. It was originally defined as the mass of one cubic centimeter of pure water at the temperature of maximum density.

History/origin: The gram is the base unit of mass in the metric system, which was established in France in the late 18th century. It was intended to be a universal and rational system of measurement.

Current use: Grams are widely used for measuring the mass of food items, ingredients, and small objects. It's a standard unit in cooking, chemistry, and various industries.