Solar Masses to Grams (M☉ to g)

1 solar mass equals 1.98847×10³³ grams exactly.

1 solar mass = 1.98847×10³³ grams

How to convert solar masses to grams

To convert solar masses to grams, multiply the number of solar masses by 1.98847×10³³. This factor is exact. To go the other way, multiply grams by 5.02899214×10⁻³⁴ (rounded).

grams = solar masses × 1.98847×10³³

Example: 10 solar masses = 1.98847×10³⁴ grams.

Approximate value. Standards for the solar mass varied by place and period, so this converter uses the most commonly cited value. Treat results as estimates, not exact figures.

About these units

Solar Mass (M☉)

AstronomicalCurrent unitApproximate value

About 1.988×10³⁰ kg, the mass of the Sun (roughly 332,946 Earths). Used for stars and galaxies.

The solar mass is the mass of the Sun used as the standard weight for stars, black holes and galaxies. The best estimate is about 1.98847 x 10^30 kg, with an uncertainty near 0.005 percent, while the International Astronomical Union's nominal value is 1.988416 x 10^30 kg. That is about 332,946 Earth masses, commonly rounded to 333,000.

Isaac Newton made the first known estimate in the Principia of 1687, putting the Earth to Sun mass ratio at about 1 to 28,700. In the third edition he revised this to 1 to 169,282 after finding that his solar parallax was faulty. Transits of Venus in 1761 and 1769 later improved the Sun's distance, and Cavendish's 1798 measurement gave a usable value of G.

The unit predates precise values of G and the astronomical unit, and it survives because Kepler's third law lets astronomers compute the masses of planets and binary stars directly from orbital data in solar units. The product GM of the Sun is known far better than the mass itself.

1 solar mass = 1.98847×10³⁰ kilograms (approximately).

Sources: Wikipedia: Solar mass

Gram (g)

Metric (SI)Current unit

One thousandth of a kilogram. The standard unit for food quantities and small objects.

A gram was once defined as a small drop of the natural world. The French National Convention of 1795 set it as the absolute weight of a volume of pure water equal to a cube one hundredth of a metre on each side, a cubic centimetre. The reference temperature was first the melting point of ice and was later changed to the temperature of maximum density of water, about 4 degrees Celsius. The word came into French as gramme, from Late Latin gramma, itself from the Greek for a letter or small mark; in Late Antiquity it meant about one twenty-fourth of an ounce.

The gram was the base unit of mass in the centimetre-gram-second system, but in 1960 the SI took the kilogram as its base unit, which made the gram one thousandth of it. That is why it appears in so many everyday places: it is the standard for non-liquid ingredients in cooking and shopping, and nutrition labels commonly list contents per 100 g. For a sense of scale, a small paper clip or a pen cap weighs about a gram, and a Japanese 1-yen coin is close to exactly that, while a US penny is around 2.5 g.

1 gram = 0.001 kilograms (exactly).

Sources: Wikipedia: Gram; Wikipedia: Kilogram

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