Convert Grains to Kilograms
1 grain (gr) equals 0.00006479891 kilograms (kg).
1 gr = 0.00006479891 kg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk grain to kilogram converter to paste a column from Excel.
How to Convert Grain to Kilogram
- 1 gr = 0.00006479891 kg
- 1 kg = 15432.35835 gr
- Example: convert 15 gr to kg: 15 gr = 15 × 0.00006479891 kg = 0.00097198365 kg
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
kg = gr × 0.00006479891
or kg = gr ÷ 15432.35835294
Derivation from SI units:
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- SI base unit, fixed by the Planck constant h = 6.626 070 15 × 10⁻³⁴ J·s
Both units are defined exactly, so the factor is exact. Grain definition: grain; Kilogram definition: kilogram.
Worked examples
- A reading of 40 gr converts to 0.0025919564 kg.
40 gr × 0.00006479891 = 0.0025919564 kg - A value of 150 gr is 0.0097198365 kg.
150 gr × 0.00006479891 = 0.0097198365 kg
Grain to Kilogram conversion table
| Grains (gr) | Kilograms (kg) |
|---|---|
| 1 gr | 0.00006479891 kg |
| 5 gr | 0.00032399455 kg |
| 10 gr | 0.0006479891 kg |
| 15 gr | 0.00097198365 kg |
| 20 gr | 0.0012959782 kg |
| 40 gr | 0.0025919564 kg |
| 55 gr | 0.00356394005 kg |
| 100 gr | 0.006479891 kg |
| 115 gr | 0.00745187465 kg |
| 124 gr | 0.00803506484 kg |
| 150 gr | 0.0097198365 kg |
| 180 gr | 0.0116638038 kg |
| 300 gr | 0.019439673 kg |
| 1000 gr | 0.06479891 kg |
| 7000 gr | 0.45359237 kg |
Where it's used
Grains are used for bullet and powder weights, while kilograms appear in body weight and food packaging. 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 kilograms are in 1 grain?
1 gr = 0.00006479891 kg.
How do I convert grains to kilograms?
Multiply the value in gr by 0.00006479891, or divide it by 15432.35835. For example, 15 gr × 0.00006479891 = 0.00097198365 kg.
Is the gr to kg conversion exact?
Yes. Both units are defined exactly, and 1 gr is exactly 0.00006479891 kg.
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 , Section 2.3.1, base unit definitions.
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 Kilograms. Retrieved October 17, 2026, from https://scientificconverters.com/mass/grains-to-kilograms/
IEEE
Scientific Converters, "Convert Grains to Kilograms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/grains-to-kilograms/