Convert Grains to Solar Masses
Convert Grains (gr) to Solar Masses (M☉) instantly and accurately.
Conversion Formula
M☉ = gr × 3.257994791e-35
About Grains
A grain (gr) is the smallest unit in both the avoirdupois and troy weight systems, equal to exactly 64.79891 milligrams. Originally defined as the mass of a single grain of barley or wheat from the middle of an ear, it has been a standard of weight since ancient times. Today, grains are used to weigh gunpowder charges and bullets (a standard .308 rifle bullet weighs 168 gr), pharmaceutical preparations in apothecary compounding, and the fineness of gold alloys. Arrowhead and fishing hook weights are also specified in grains.
About Solar Masses
A solar mass (M☉) is the mass of our Sun - approximately 1.989 × 10³⁰ kg - and is the standard unit for measuring stellar and galactic masses in astronomy. The Sun contains 99.86% of the total mass of the Solar System. Stellar evolution models describe stars of 0.08 M☉ (the minimum for hydrogen fusion) to over 200 M☉ (the most massive known stars). Supermassive black holes at the centres of galaxies range from millions to billions of solar masses: the black hole at the centre of the Milky Way (Sagittarius A*) is approximately 4.3 million M☉.
Quick Reference Table
| Grains (gr) | Solar Masses (M☉) |
|---|---|
| 1 gr | 3.258 × 10-35 M☉ |
| 2 gr | 6.516 × 10-35 M☉ |
| 5 gr | 1.629 × 10-34 M☉ |
| 10 gr | 3.258 × 10-34 M☉ |
| 25 gr | 8.145 × 10-34 M☉ |
| 50 gr | 1.629 × 10-33 M☉ |
| 100 gr | 3.258 × 10-33 M☉ |