What is the mass of the Sun?
The solar mass is M_☉ = 1.98841e30 kg (uncertainty ±4.5e25 kg), based on IAU 2015 nominal values.
Open the interactive PhysRef tool →Key facts
| Value | 1.98841e30 kg |
|---|---|
| Symbol | M_☉ |
| Uncertainty | ±4.5e25 kg |
| Approximation | ≈ 1.988e30 kg |
| Source | IAU 2015 (Resolution B3) GM☉ ÷ CODATA 2018 G |
Frequently asked questions
What is the mass of the Sun in kg?
M_☉ = 1.98841e30 kg, about 333,000 times the mass of the Earth.
Why is the solar mass used as a unit?
In astronomy, stellar and galactic masses are conveniently expressed in solar masses (M_☉).
How is the solar mass measured?
From the Sun's gravitational parameter GM_☉, divided by the gravitational constant G.
Related pages
Solar mass is part of PhysRef on GOAT Lab — a free reference you can use without signing up, and it works offline. Open the tool above for any custom value.
Part of GOAT Lab — 28 free, browser-based science, engineering and developer tools. No sign-up.