Convert grains to grams

1 gr=0.0648g

Use the converter below to change any grains value into grams instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.064799

Conversion formula

Forward

grams = grains × 0.0648

Reverse

grains = grams × 15.4324

Example: 10 gr × 0.0648 = 0.648 g.

About both units

From

Grain

The grain equals 64.79891 milligrams exactly, one of the oldest units of mass. Originally defined as the weight of a single grain of barley. Today used almost exclusively in firearms (bullet and gunpowder weights) and pharmaceuticals.

Real-world: A 9 mm bullet typically weighs 115–124 grains (7.45–8.03 g). Aspirin grain dosing: "5 grain aspirin" = 325 mg.

Read full grain reference →

Gram

The gram equals one thousandth of a kilogram. It is the standard unit in European cooking, pharmaceuticals and jewellery. An A4 sheet of 80 g/m² paper weighs about 5 g; a regular chicken egg is around 60 g. The word "gram" comes from the Greek "gramma", a small weight.

Real-world: A chicken egg weighs about 60 g. A standard bar of chocolate is 100 g. A euro coin weighs 7.5 g.

Read full gram reference →

Grain to Gram conversion table

Common grains to grams values for quick reference.

Grain (gr)	Gram (g)
1 gr	0.0648 g
5 gr	0.324 g
10 gr	0.648 g
25 gr	1.61997 g
50 gr	3.23995 g
100 gr	6.47989 g
250 gr	16.1997 g
500 gr	32.3995 g
1,000 gr	64.7989 g
5,000 gr	323.995 g

Tips & common mistakes

Quick tips

1 grain = 64.79891 mg exactly. 7000 grains = 1 pound.
Ballistics is one of the few modern contexts where grains are essential.
Some older pharmacology dosing survives in grain units — 5 gr ≈ 325 mg.

Avoid these

Confusing the grain (mass) with the troy grain in older precious-metal contexts — they are identical (64.8 mg).
Assuming "grain" refers to an amount of cereal — in firearms it is always a weight.
Reading "5 gr" as 5 grams — it is 5 grains (324 mg).

Frequently asked questions

How many grams in a grain?

One grain equals 0.0648 grams.

How do I convert grains to grams?

Multiply the grain value by 0.0648 to get the equivalent in grams.

What is 100 grains in grams?

100 grains equals 6.47989 grams.

Is a grain bigger than a gram?

No. 1 grain equals 0.0648 grams, so one grain is smaller.

How to convert grains to grams without a calculator?

Multiply by 0.06 for a quick estimate; use a calculator for precise results.

Related weight conversions

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