Schwarzschild radius
Calculate Schwarzschild radius instantly with the exact formula and a worked example. Free online calculator — no signup.
Schwarzschild radius
Masskg
Schwarzschild radius
2.9662km
More about: Schwarzschild radius
What it calculates
The “Schwarzschild radius” calculator computes Schwarzschild radius in km from 1 parameter: mass (kg).
An astronomy calculation for enthusiasts and scientists.
Example calculation
With parameters Mass = 2,000,000,000,000,000,000,000,000,000,000 kg the result is 2.97 km (Rs = 2GM/c²).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.