Convert Grains to Stone
1 grain (gr) equals 0.00001020408163 stone (st).
1 gr = 0.00001020408163 st
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk grain to stone converter to paste a column from Excel.
How to Convert Grain to Stone
- 1 gr = 0.00001020408163 st
- 1 st = 98000 gr
- Example: convert 15 gr to st: 15 gr = 15 × 0.00001020408163 st = 0.0001530612245 st
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement). st: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
st = gr ÷ 98000
Derivation from SI units:
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- 1 st = 14 lb = 6.35029318 kg (exact)
- 1 gr = 0.00006479891 kg ÷ 6.35029318 kg per st = 0.00001020408163265 st
Both units are defined exactly, so the factor is exact. Grain definition: grain; Stone definition: stone.
Worked examples
- A reading of 40 gr converts to 0.0004081632653 st.
40 gr × 0.00001020408163 = 0.0004081632653 st - A value of 150 gr is 0.001530612245 st.
150 gr × 0.00001020408163 = 0.001530612245 st
Grain to Stone conversion table
| Grains (gr) | Stone (st) |
|---|---|
| 1 gr | 0.00001020408163 st |
| 5 gr | 0.00005102040816 st |
| 10 gr | 0.0001020408163 st |
| 15 gr | 0.0001530612245 st |
| 20 gr | 0.0002040816327 st |
| 40 gr | 0.0004081632653 st |
| 55 gr | 0.0005612244898 st |
| 100 gr | 0.001020408163 st |
| 115 gr | 0.001173469388 st |
| 124 gr | 0.001265306122 st |
| 150 gr | 0.001530612245 st |
| 180 gr | 0.001836734694 st |
| 300 gr | 0.00306122449 st |
| 1000 gr | 0.01020408163 st |
| 7000 gr | 0.07142857143 st |
Where it's used
Grains are used for bullet and powder weights, while stone appear in body weight in the UK and Ireland (e.g. 11 st 6 lb). 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 stone are in 1 grain?
1 gr = 0.00001020408163 st.
How do I convert grains to stone?
Multiply the value in gr by 0.00001020408163, or divide it by 98000. For example, 15 gr × 0.00001020408163 = 0.0001530612245 st.
Is the gr to st conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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)".
- 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, pound (avoirdupois).
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 Stone. Retrieved October 17, 2026, from https://scientificconverters.com/mass/grains-to-stone/
IEEE
Scientific Converters, "Convert Grains to Stone," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/grains-to-stone/