Convert Grains to Grams
1 grain (gr) equals 0.06479891 grams (g).
1 gr = 0.06479891 g
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk grain to gram converter to paste a column from Excel.
How to Convert Grain to Gram
- 1 gr = 0.06479891 g
- 1 g = 15.43235835 gr
- Example: convert 15 gr to g: 15 gr = 15 × 0.06479891 g = 0.97198365 g
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
g = gr × 0.06479891
or g = gr ÷ 15.43235835294
Derivation from SI units:
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- 1 g = 10⁻³ kg
- 1 gr = 0.00006479891 kg ÷ 0.001 kg per g = 0.06479891 g
Both units are defined exactly, so the factor is exact. Grain definition: grain; Gram definition: gram.
Worked examples
- A reading of 40 gr converts to 2.5919564 g.
40 gr × 0.06479891 = 2.5919564 g - A value of 150 gr is 9.7198365 g.
150 gr × 0.06479891 = 9.7198365 g
Grain to Gram conversion table
| Grains (gr) | Grams (g) |
|---|---|
| 1 gr | 0.06479891 g |
| 5 gr | 0.32399455 g |
| 10 gr | 0.6479891 g |
| 15 gr | 0.97198365 g |
| 20 gr | 1.2959782 g |
| 40 gr | 2.5919564 g |
| 55 gr | 3.56394005 g |
| 100 gr | 6.479891 g |
| 115 gr | 7.45187465 g |
| 124 gr | 8.03506484 g |
| 150 gr | 9.7198365 g |
| 180 gr | 11.6638038 g |
| 300 gr | 19.439673 g |
| 1000 gr | 64.79891 g |
| 7000 gr | 453.59237 g |
Where it's used
Grains are used for bullet and powder weights, while grams appear in recipes and nutrition labels. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Grain to other weight and mass units
| Conversion | 1 gr equals |
|---|---|
| grain to kilogram | 0.00006479891 kg |
| grain to gram | 0.06479891 g |
| grain to milligram | 64.79891 mg |
| grain to microgram | 64798.91 µg |
| grain to metric ton | 6.479891 × 10⁻⁸ t |
| grain to pound | 0.0001428571429 lb |
| grain to ounce | 0.002285714286 oz |
| grain to stone | 0.00001020408163 st |
| grain to short ton | 7.142857143 × 10⁻⁸ ton (US) |
| grain to long ton | 6.37755102 × 10⁻⁸ ton (UK) |
| grain to troy ounce | 0.002083333333 oz t |
| grain to carat | 0.32399455 ct |
Frequently asked questions
How many grams are in 1 grain?
1 gr = 0.06479891 g.
How do I convert grains to grams?
Multiply the value in gr by 0.06479891, or divide it by 15.43235835. For example, 15 gr × 0.06479891 = 0.97198365 g.
Is the gr to g conversion exact?
Yes. Both units are defined exactly, and 1 gr is exactly 0.06479891 g.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "grain (gr)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Grains to Grams. Retrieved October 17, 2026, from https://scientificconverters.com/mass/grains-to-grams/
IEEE
Scientific Converters, "Convert Grains to Grams," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/grains-to-grams/