Home / Weight and Mass Conversion / Convert grams to milligrams

Convert grams to milligrams

Please provide values below to convert gram [g] to milligram [mg], or quite the opposite.

From: gram
To: milligram


Definition: A gram (symbol: g) is a unit of mass in the International System of Units (SI). The definition of the gram is based on the kilogram, where a gram is one thousandth of a kilogram (the SI base unit of mass, currently based on an international prototype).

History/origin: Originally, a gram was defined as the absolute weight of pure water in a cubic centimeter at the temperature of melting ice (later 4 °C). The gram used to be a fundamental unit of mass as part of centimeter-gram-second systems of units up until the widespread adoption of SI, which uses kilograms as the base unit of mass. The gram was later redefined as one thousandth of a kilogram, the SI (meter-kilogram-second system of units) base unit of mass, which is currently (May 2018) based on the mass of a physical prototype of a specific alloy.

Current use: The gram is typically used to measure non-liquid ingredients used for cooking or groceries. Standards on the nutrition labels of food products often require the relative contents to be stated per 100 grams of the product.


Definition: A milligram is a unit of weight and mass that is based on the SI (International System of Units) base unit of mass, the kilogram. It is equal to 1/1,000 grams, or 1/1,000,000 kilograms.

History/origin: The milligram is based on the SI unit of weight and mass, the kilogram. As an SI unit, it uses the "milli" SI prefix to denote that it is a submultiple of the base unit. Although the "milli" prefix denotes a submultiple with respect to the gram, the kilogram, not the gram, is technically the SI base unit of mass.

Current use: As a submultiple of an SI base unit, the milligram is widely used in many applications, from everyday use to measure the weight or mass of foods, substances, etc., to widespread use in scientific labs, among other areas.

Gram to Milligram Conversion Table

Gram [g]Milligram [mg]
0.01 g10 mg
0.1 g100 mg
1 g1000 mg
2 g2000 mg
3 g3000 mg
5 g5000 mg
10 g10000 mg
20 g20000 mg
50 g50000 mg
100 g100000 mg
1000 g1000000 mg

How to Convert Gram to Milligram

1 g = 1000 mg
1 mg = 0.001 g

Example: convert 15 g to mg:
15 g = 15 × 1000 mg = 15000 mg

Popular Weight And Mass Unit Conversions

Convert Gram to Other Weight and Mass Units