Schwarzschild Radius Calculator
Calculate the event horizon radius and properties of a non-rotating black hole
Known black holes: Sagittarius A* (~4 million M☉), M87* (~6.5 billion M☉), Stellar black holes (5-100 M☉)
Formulas Used
Schwarzschild radius: r_s = 2GM/c²
Hawking temperature: T = ħc³/(8πGMk_B)
Surface gravity: κ = c⁴/(4GM)
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: University Physics
by Young & Freedman
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.