Atomic Radius Calculator
Explore atomic radii with conversions and understand how atomic size varies across the periodic table.
Na
Sodium
Empirical Radius
190 pm
picometers
Picometers
190 pm
Angstroms
1.90 A
Nanometers
0.190 nm
Meters
1.90e-10
All Radius Types
Empirical
190 pm
Covalent
166 pm
Van der Waals
227 pm
Estimated Atomic Volume
28.73 A3
Types of Atomic Radii
- Empirical: Measured from crystalline structures
- Covalent: Half the distance between two bonded atoms
- Van der Waals: Half the distance between non-bonded atoms in contact
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Chemistry: The Central Science
by Brown, LeMay, Bursten
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.