Metric grain conversions

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Convert metric grains to

The metric grain conversion selector here selects the mass/weight measurement unit to convert to starting from metric grains (metric gr). To make a conversion starting from a unit of mass other than metric grain, simply click on the "Reset" button.

What is metric grain?

The metric grain (or pearl grain) is a unit of mass in the metric system equal to 0.050x10-3 kilograms (1 metric grain = 0.050x10-3 kg), the base unit of mass in the International System of Units (SI). It is also equal to 0.050 grams (g), or 50 milligrams (mg) or 50,000 micrograms (μg) (SI units of mass), or about 1.102311x10-4 pounds (lb) or 0.001763698 ounces (oz), which are US customary / Imperial units of mass.

The grain definition varies depending on the system of units used, as follows:

  • 1 grain = 1 avoirdupois grain = 1 troy grain = 1 Apothecaries grain = 64.79891 milligrams
  • 1 metric grain = 1 pearl grain = 50 milligrams = 1/4 (metric) carats

The metric grain (or pearl grain) is used as a unit of mass for pearls and diamonds.


metric gr


metric grains

Also called:

pearl grain (plural: pearl grains)

Metric grain conversions: quick links

A compehensive list with conversions from metric grains to other (metric, imperial, or customary) mass and weight measurement units is presented below.