Schwarzschild Radius Calculator

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Calculates the radius of the event horizon for a non-rotating black hole of a given mass.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Mass of the black hole in the units shown.

Step 2

Read Mass in Kilograms and Schwarzschild Radius in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Mass of the black hole: 1 solar masses

Mass in Kilograms: 1,989,000,000,000,000,000,000,000,000,000 kg; Schwarzschild Radius: 2,954.126555 m

Mass of the black hole: 0.000003 solar masses

Mass in Kilograms: 5,967,000,000,000,000,000,000,000 kg; Schwarzschild Radius: 0.008862379665 m

Mass of the black hole: 1,000,000 solar masses

Mass in Kilograms: 1,989,000,000,000,000,000,000,000,000,000,000,000 kg; Schwarzschild Radius: 2,954,126,555 m

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