Principal Quantum Number Calculator
Calculate energy levels and orbitals for hydrogen-like atoms
Formulas Used
E_n = -13.6 * Z^2 / n^2 eV
r_n = n^2 * a_0 / Z
Orbitals per shell = n^2
Max electrons = 2n^2
💡
Help us improve!
How would you rate the Principal Quantum Number Calculator?
Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
📚
Formula Source: University Physics
by Young & Freedman
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.