Grams to Grains (g to gr)

1 gram equals 15.43235835 grains (rounded).

1 gram = 15.43235835 grains

How to convert grams to grains

To convert grams to grains, multiply the number of grams by 15.43235835. The factor is rounded to 10 significant digits. To go the other way, multiply grains by 0.06479891.

grains = grams × 15.43235835

Example: 10 grams = 154.3235835 grains.

About these units

Gram (g)

Metric (SI)Current unit

One thousandth of a kilogram. The standard unit for food quantities and small objects.

A gram was once defined as a small drop of the natural world. The French National Convention of 1795 set it as the absolute weight of a volume of pure water equal to a cube one hundredth of a metre on each side, a cubic centimetre. The reference temperature was first the melting point of ice and was later changed to the temperature of maximum density of water, about 4 degrees Celsius. The word came into French as gramme, from Late Latin gramma, itself from the Greek for a letter or small mark; in Late Antiquity it meant about one twenty-fourth of an ounce.

The gram was the base unit of mass in the centimetre-gram-second system, but in 1960 the SI took the kilogram as its base unit, which made the gram one thousandth of it. That is why it appears in so many everyday places: it is the standard for non-liquid ingredients in cooking and shopping, and nutrition labels commonly list contents per 100 g. For a sense of scale, a small paper clip or a pen cap weighs about a gram, and a Japanese 1-yen coin is close to exactly that, while a US penny is around 2.5 g.

1 gram = 0.001 kilograms (exactly).

Sources: Wikipedia: Gram; Wikipedia: Kilogram

Grain (gr)

US & ImperialTraditional unit (still used in some regions)

Exactly 64.79891 mg, based on the weight of a grain of barley. Still used for the weight of bullets, arrows and some medicines.

Barley and wheat seeds served as the earliest common weights in the Mediterranean, because a dry seed is small and fairly consistent. Medieval English law tied weights to the average mass of such grains, and the name grain stuck even after the link to actual cereal faded. The unit is exactly 64.79891 milligrams, fixed by the 1959 international yard and pound agreement, and NIST lists the same figure of 6.479891 x 10^-5 kilogram as exact.

Grain is unusual in being identical in the troy, avoirdupois and apothecaries' systems. A troy pound has 5,760 grains and an avoirdupois pound has 7,000. Modern use is mostly in niches: bullet and propellant weights, arrow weights in archery, and water hardness expressed as grains per gallon. Older drug doses were also given this way, with a standard 325 milligram aspirin tablet equal to five grains. Jewelers once used a pearl grain, a quarter of a carat. In the United Kingdom the unit has no legal standing for trade.

1 grain = 0.00006479891 kilograms (exactly).

Sources: Wikipedia: Grain (unit); NIST SP 811 Appendix B.8 (conversion factors)

Related conversions

See all weight & mass units.