Grains to Grams Converter
Convert grains to grams and grams to grains. Perfect for ammo reloading, archery, and jewelry weights.
← Back to Weight Converter | Home
Grains to Grams Converter
Grains (gr)
Grams (g)
Common Conversion Examples
1 gr = 0.064799 g
1 grain = 0.06479891 grams
10 gr = 0.647989 g
10 grains = 0.6479891 grams
55 gr = 3.563940 g
55 grains = 3.563940 grams
100 gr = 6.479891 g
100 grains = 6.479891 grams
150 gr = 9.719836 g
150 grains = 9.719837 grams
300 gr = 19.439673 g
300 grains = 19.439673 grams
Grains to Grams: Formula and Quick Guide
Quick gr ⇄ g calculator for reloading, archery arrows, bullets, powder and jewelry. Get instant results with the exact formula.
Formula
- grams = grains × 0.06479891
- grains = grams ÷ 0.06479891
Unique example
A 150 gr hunting bullet weighs 150 × 0.06479891 = 9.719837 g (≈ 9.72 g).
Grains to Grams: Definition, History, Uses, and Examples
Definition
A grain (gr) is a traditional unit of mass used in ammunition reloading, archery, and jewelry. It is legally defined as exactly 64.79891 milligrams. A gram (g)is the SI unit of mass widely used in science and everyday measurements.
Grams (g) = Grains (gr) × 0.06479891
Grains (gr) = Grams (g) ÷ 0.06479891
Origin or History
The grain originated from the mass of a typical cereal grain. It became a common base unit across the troy, apothecaries, and avoirdupois systems. Modern standards fix the grain at 64.79891 mg, ensuring consistent conversions with grams.
Current Use
- Ammo reloading: Bullet weights like 55 gr, 150 gr, powder charges in grains.
- Archery: Arrow weights and inserts often listed in grains.
- Jewelry: Small masses occasionally measured in grains alongside carats.
- Lab/precision: Historical references and niche applications.
Examples
| Grains (gr) | Grams (g) | Example Use |
|---|---|---|
| 55 gr | ≈ 3.56394 g | .223/5.56 bullet weight |
| 100 gr | ≈ 6.47989 g | Archery arrow component |
| 125 gr | ≈ 8.09986 g | Handgun bullet weight |
| 150 gr | ≈ 9.71984 g | Hunting bullet (e.g., .308) |
| 300 gr | ≈ 19.43967 g | Heavy projectile |
| 700 gr | ≈ 45.35924 g | Large arrow or specialty load |
Step-by-step example
Convert 150 grains to grams: 150 × 0.06479891 = 9.719837 g (≈ 9.72 g).