Convert Grains to Stone
1 grain is 0.0000102 st. One grain is exactly 0.0000102040816327 stone.
One grain is 1.0204 × 10^-5 stone. To convert grains to stone, multiply by 1.0204 × 10^-5; to go the other way, divide by 1.0204 × 10^-5 or multiply by 98000. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 44. Exactly 64.79891 milligrams, the unit both the avoirdupois and troy systems are built from.
Factor checked against the defining standard · How we check
- Grains × 1.0204 × 10^-5
1 * 0.00001020 st
1 grain in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 0.002285714286 oz | × 0.00228571428571 |
| pounds | 0.0001428571429 lb | × 0.000142857142857 |
| stone | 0.00001020408163 st | × 0.0000102040816327 |
| US tons | 0.00000007142857143 ton | × 0.0000000714285714286 |
| micrograms | 64,798.91 mcg | × 64,798.91 |
| milligrams | 64.79891 mg | × 64.79891 |
| centigrams | 6.479891 cg | × 6.479891 |
| grams | 0.06479891 g | × 0.06479891 |
| kilograms | 0.00006479891 kg | × 0.00006479891 |
| slugs | 0.000004440135739 slug | × 0.0000044401357388 |
| tonnes | 0.00000006479891 t | × 0.00000006479891 |
| carats | 0.32399455 ct | × 0.32399455 |
| troy ounces | 0.002083333333 ozt | × 0.00208333333333 |
| grains (as entered) | 1 gr | — |
| long tons | 0.0000000637755102 LT | × 0.0000000637755102041 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert grains to stone? The converter and the working
- 1.Take the measurement in grains.
- 2.Multiply by 1.0204 × 10^-5 — that is how many stone fit in one grain.
- 3.To go back the other way, divide by 1.0204 × 10^-5, or multiply by 98000.
Worked example: 25 grains to stone
- Formula
- gr × 1.0204 × 10^-5 = st
- Arithmetic
- 25 × 1.0204 × 10^-5 = 0.0002551 st
- Answer
- 25 gr = 0.0002551 st
The factor is rounded for display; the figure above is computed from the full value.
Grains to stone conversion table
| Grains | Stone |
|---|---|
| 1 gr | 0.0000102 st |
| 2 gr | 0.00002041 st |
| 3 gr | 0.00003061 st |
| 4 gr | 0.00004082 st |
| 5 gr | 0.00005102 st |
| 6 gr | 0.00006122 st |
| 7 gr | 0.00007143 st |
| 8 gr | 0.00008163 st |
| 9 gr | 0.00009184 st |
| 10 gr | 0.000102 st |
| 12 gr | 0.0001224 st |
| 15 gr | 0.0001531 st |
| 20 gr | 0.0002041 st |
| 25 gr | 0.0002551 st |
| 50 gr | 0.0005102 st |
| 100 gr | 0.00102 st |
| 200 gr | 0.002041 st |
| 300 gr | 0.003061 st |
| 500 gr | 0.01 st |
| 1000 gr | 0.01 st |
| 2000 gr | 0.02 st |
| 5000 gr | 0.05 st |
| 10000 gr | 0.1 st |
What is a grain?
Exactly 64.79891 milligrams, the unit both the avoirdupois and troy systems are built from. Bullet weights and powder charges are still measured in it, and so are some pharmaceutical doses.
What is a stone?
Fourteen pounds. Still the everyday unit of body weight in Britain and Ireland, and nowhere else.
How many stone are in a grain?
One grain is 1.0204 × 10^-5 stone. Going the other way, one stone is 98000 grains. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every weight unit here
The whole group — 15 units with their symbols and the size of each one in kilograms — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a grain.
Cite this page
- APA
- Rule Calculator. (2026). Convert Grains to stone. Rule Calculator. https://rulecalculators.com/convert/grain-to-stone
- MLA
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- Chicago
- Rule Calculator. "Convert Grains to stone." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/grain-to-stone.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many stone are in a grain?
- 1.0204 × 10^-5. Fourteen pounds. Still the everyday unit of body weight in Britain and Ireland, and nowhere else.
- How do I convert stone back to grains?
- Divide by 1.0204 × 10^-5, or multiply by 98000 — they are the same operation.
Other weight conversions
Stone to grains — the same conversion the other way.