Black hole calculator: Schwarzschild radius, Hawking temperature

The Sun will never become a black hole: it is too light.

Horizon radius

2.95 km

Diameter 5.91 km, about the size of the city of Paris

Hawking temperature

6.17 × 10⁻⁸ K

colder than the cosmic microwave background (2.7 K): it absorbs more than it emits

Evaporation lifetime

2.1 × 10⁶⁷ years

1.5 × 10⁵⁷ times the age of the Universe

Entropy (maximum information)

1.51 × 10⁷⁷ bits

Spaghettification (100 g over 2 m)

Outside the horizon

at 810 km from the centre, well outside the horizon: you would be destroyed before entering.

Tide at the horizon (2 m body)

2.1 × 10⁹ g

From horizon to singularity

15.5 µs

Mean density

1.84 × 10¹⁹ kg/m³

1.84 × 10¹⁶ times the density of water

Lifetime computed with photon emission only; including other particles shortens it somewhat.