1 gr = 0.0647989 g (grain → gram)
1 gr = 0.0647989 g
1 grain equals 0.0647989 grams. To convert grains to grams, multiply the grain value by 0.0647989. For quick reference: 1 gr = 0.0647989 g, 5 gr = 0.323995 g, 10 gr = 0.647989 g, 100 gr = 6.47989 g.
Start with your value in grains.
Multiply the grain value by 0.0647989. This is the exact conversion factor from grains to grams.
The product is your value in grams. For example, 5 gr × 0.0647989 = 0.323995 g.
The exact factor from grains to grams is 0.0647989.
Grams = Grains × 0.0647989
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Grains (gr) | Grams (g) |
|---|---|
| 0.1 gr | 0.0064799 g |
| 0.25 gr | 0.0162 g |
| 0.5 gr | 0.032399 g |
| 1 gr | 0.064799 g |
| 1.5 gr | 0.097198 g |
| 2 gr | 0.1296 g |
| 2.5 gr | 0.162 g |
| 3 gr | 0.1944 g |
| 4 gr | 0.2592 g |
| 5 gr | 0.32399 g |
| 6 gr | 0.38879 g |
| 7 gr | 0.45359 g |
| 8 gr | 0.51839 g |
| 9 gr | 0.58319 g |
| 10 gr | 0.64799 g |
| 12 gr | 0.77759 g |
| 15 gr | 0.97198 g |
| 18 gr | 1.1664 g |
| 20 gr | 1.296 g |
| 25 gr | 1.62 g |
| 30 gr | 1.944 g |
| 35 gr | 2.268 g |
| 40 gr | 2.592 g |
| 45 gr | 2.916 g |
| 50 gr | 3.2399 g |
| 60 gr | 3.8879 g |
| 70 gr | 4.5359 g |
| 75 gr | 4.8599 g |
| 80 gr | 5.1839 g |
| 90 gr | 5.8319 g |
| 100 gr | 6.4799 g |
| 120 gr | 7.7759 g |
| 125 gr | 8.0999 g |
| 150 gr | 9.7198 g |
| 175 gr | 11.34 g |
| 180 gr | 11.664 g |
| 200 gr | 12.96 g |
| 225 gr | 14.58 g |
| 250 gr | 16.2 g |
| 275 gr | 17.82 g |
| 300 gr | 19.44 g |
| 350 gr | 22.68 g |
| 400 gr | 25.92 g |
| 450 gr | 29.16 g |
| 500 gr | 32.399 g |
| 600 gr | 38.879 g |
| 750 gr | 48.599 g |
| 1000 gr | 64.799 g |
| 2000 gr | 129.6 g |
| 5000 gr | 323.99 g |
A typical rifle bullet weighs 55–180 grains. A recurve bow might have a 40-grain arrow point. In grams, that gives you: 1 gr = 0.0647989 g, 10 gr = 0.647989 g, 100 gr = 6.47989 g.
The grain (gr) equals exactly 64.79891 milligrams — historically the weight of a single grain of barley, and the common base unit underlying both the avoirdupois and troy weight systems (7,000 grains = 1 avoirdupois pound). It survives today in ammunition (bullet and gunpowder charge weights) and archery (arrow and bow draw-weight specs).
The gram (g) is a metric unit of mass equal to one-thousandth of a kilogram. It is the everyday unit for food labeling, postage, jewelry, and laboratory measurements. The 2019 SI redefinition fixed the kilogram (and therefore the gram) in terms of Planck's constant, ending more than a century of dependence on a physical prototype.
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