Convert precision weights: Grains (gr) ↔ Grams (g) — accurate for ammunition, jewelry, pharmaceuticals, and small-scale measurements.
Select conversion direction:
Precision Weight Conversion Formula (International Standard):
1 Grain = 0.06479891 Grams | 1 Gram = 15.43235835 Grains
Grams = Grains × 0.06479891 | Grains = Grams ÷ 0.06479891 (Results: 3 decimal places)
*Statutory definition: 1 Grain = 1/7000 Pound = 0.06479891 g (global precision measurement standard)
Precision unit: Ammunition (bullet weight), jewelry, pharmaceuticals, historical weight measurements
Display format:
Quick conversions (common precision weights) - click to auto-fill:
Useful for precision measurements? Share with shooters, jewelers, pharmacists, or anyone needing accurate weight conversions:
Understanding precision weight units for specialized measurements and everyday use.
| Unit | Symbol | Conversion Factor | Common Uses |
|---|---|---|---|
| Grain | gr | 1 gr = 0.06479891 g = 1.00000000057 mg = 1/7000 lb | Ammunition (bullet/powder weight), jewelry (small components), pharmaceuticals (precision doses), historical measurements |
| Gram | g | 1 g = 15.43235835 gr = 1000 mg = 0.00220462 lb | Global standard: Food, jewelry, small objects, scientific experiments, everyday weight measurements |
| Grains (gr) | ≈ | Grams (g) | Application |
|---|---|---|---|
| 5 | ≈ | 0.324 | Small pharmaceutical tablet dose |
| 55 | ≈ | 3.564 | Typical .223 rifle bullet weight |
| 200 | ≈ | 12.960 | Jewelry pendant weight |
| 1000 | ≈ | 64.799 | Large pharmaceutical bulk dose |
| 7000 | ≈ | 453.592 | 1 pound (avoirdupois) in grains |
Grains and grams are critical for high-precision applications — accuracy matters:
| Industry | Preferred Unit | Required Precision | Why It Matters |
|---|---|---|---|
| Ammunition | Grains (gr) | ±0.1 gr | Bullet weight affects trajectory, velocity, and accuracy |
| Pharmaceuticals | Grams (g) / Milligrams (mg) | ±0.001 g | Dose accuracy ensures efficacy and safety |
| Jewelry | Grams (g) / Grains (gr) | ±0.01 g | Precise weight determines material value (gold/silver) |
About grains, grams, and precision weight conversions
The conversion factor has historical and statutory origins:
Precise factor: 1 grain = 0.06479891000000034 grams (exact for scientific/precision use)
Practical use: 3-6 decimal places are standard for specialized applications; 1 decimal place suffices for general reference
The choice depends on industry tradition, precision needs, and regional standards:
Use these cross-unit conversion factors for full precision measurement flexibility:
1 Grain = 64.79891 Milligrams (mg) = 0.00228571 Ounces (avoirdupois)
1 Gram = 1000 Milligrams (mg) = 0.03527396 Ounces (avoirdupois)
1 Ounce = 437.5 Grains = 28.3495 Grams
Practical cross-conversion examples:
These conversions are essential for professionals working across industries (e.g., a pharmacist converting historical grain-based recipes to modern gram/milligram doses).
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