Convert Grains to Slugs
1 grain is 0.00000444 slug. One grain is exactly 0.0000044401357388 slugs.
One grain is 4.4401 × 10^-6 slugs. To convert grains to slugs, multiply by 4.4401 × 10^-6; to go the other way, divide by 4.4401 × 10^-6 or multiply by 225218.34. 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 × 4.4401 × 10^-6
1 * 0.00000440 slug
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 slugs? The converter and the working
- 1.Take the measurement in grains.
- 2.Multiply by 4.4401 × 10^-6 — that is how many slugs fit in one grain.
- 3.To go back the other way, divide by 4.4401 × 10^-6, or multiply by 225218.34.
Worked example: 25 grains to slugs
- Formula
- gr × 4.4401 × 10^-6 = slug
- Arithmetic
- 25 × 4.4401 × 10^-6 = 0.000111 slug
- Answer
- 25 gr = 0.000111 slug
The factor is rounded for display; the figure above is computed from the full value.
Grains to slugs conversion table
| Grains | Slugs |
|---|---|
| 1 gr | 0.00000444 slug |
| 2 gr | 0.00000888 slug |
| 3 gr | 0.00001332 slug |
| 4 gr | 0.00001776 slug |
| 5 gr | 0.0000222 slug |
| 6 gr | 0.00002664 slug |
| 7 gr | 0.00003108 slug |
| 8 gr | 0.00003552 slug |
| 9 gr | 0.00003996 slug |
| 10 gr | 0.0000444 slug |
| 12 gr | 0.00005328 slug |
| 15 gr | 0.0000666 slug |
| 20 gr | 0.0000888 slug |
| 25 gr | 0.000111 slug |
| 50 gr | 0.000222 slug |
| 100 gr | 0.000444 slug |
| 200 gr | 0.000888 slug |
| 300 gr | 0.001332 slug |
| 500 gr | 0.00222 slug |
| 1000 gr | 0.00444 slug |
| 2000 gr | 0.01 slug |
| 5000 gr | 0.02 slug |
| 10000 gr | 0.04 slug |
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 slug?
The mass that one pound-force accelerates at one foot per second squared — 32.174 pounds. It exists so that F = ma works in US customary units without a conversion constant, and it is why American engineering statics is not simply pounds.
How many slugs are in a grain?
One grain is 4.4401 × 10^-6 slugs. Going the other way, one slug is 225218.34 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 slugs. Rule Calculator. https://rulecalculators.com/convert/grain-to-slug
- MLA
- "Convert Grains to slugs." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/grain-to-slug.
- Chicago
- Rule Calculator. "Convert Grains to slugs." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/grain-to-slug.
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 slugs are in a grain?
- 4.4401 × 10^-6. The mass that one pound-force accelerates at one foot per second squared — 32.174 pounds. It exists so that F = ma works in US customary units without a conversion constant, and it is why American engineering statics is not simply pounds.
- How do I convert slugs back to grains?
- Divide by 4.4401 × 10^-6, or multiply by 225218.34 — they are the same operation.
Other weight conversions
Slugs to grains — the same conversion the other way.