Lewis Structure Calculator
Calculate Lewis dot structures, valence electrons, formal charges, and resonance structures for molecules.
Molecule Setup
Common Molecules:
Total Valence Electrons
8
Bonds: 4 | Lone Pairs: 0
BOBond Order
1.0
LPCentral Lone Pairs
0
FCFormal Charge
4
RResonance
No
Electron Summary:
- Bonding electrons: 8
- Non-bonding electrons: 0
- Total electrons: 8
Lewis Structure Rules
Octet Rule
Most atoms want 8 valence electrons (H wants 2).
Formal Charge
FC = Valence - Lone pair e- - Bonding e-/2
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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.