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Lewis Structure Generator

Master Lewis Structures in Seconds, Not Hours

The fastest free Lewis structure generator online. Draw accurate Lewis dot structures, electron dot diagrams, and molecular geometry instantly—trusted by over 50,000 students worldwide.

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Draw Lewis structures for: Molecules, ions, chemical compounds, organic molecules, inorganic compounds, Lewis dot diagrams with electron pairs, bonding electrons, and lone pairs.

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100% Free • No signup required • Instant results

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Result: Water (H₂O)

Molecular Properties

Valence Electrons 8
Net Charge 0
Central Atom Oxygen
Molar Mass 18.015 g/mol

Geometry

Bent (V-shaped)
Bond Angle 104.5°
Hybridization sp³

Element Composition

Mass Percentage

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Common Examples

verified Trusted by Students Worldwide
50K+
Active Students
1.2M+
Structures Generated
4.8★
Average Rating
98%
Accuracy Rate

What Students Say

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"This tool saved me countless hours during exam prep. The visualizations are so clear—I finally understand molecular geometry!"

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Sarah Chen
Chemistry Major, MIT
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"As a teacher, I recommend this to all my students. It's accurate, fast, and helps them visualize concepts they struggle with in textbooks."

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Dr. Michael Rodriguez
AP Chemistry Teacher
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"My grades improved from a B to an A after using this tool. It's like having a chemistry tutor available 24/7!"

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Emma Thompson
Pre-Med Student, UCLA

Aligned with Educational Standards

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Why Students Choose Our Lewis Dot Structure Generator

Stop wasting hours drawing Lewis structures by hand. Our free online Lewis structure maker saves you time, eliminates errors, and helps you understand chemistry faster—so you can spend more time mastering concepts and less time struggling with diagrams. Use it as a lewis dot structure calculator, a lewis structure solver, or simply a fast lewis structure drawer for organic and inorganic chemistry.

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Save 10+ Hours Per Week

Generate accurate structures in seconds instead of struggling for minutes on each molecule.

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Boost Your Grades

Get perfect diagrams every time and understand complex molecules faster with clear visualizations.

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Learn Faster

Visual learning helps you grasp molecular geometry and bonding concepts that seem confusing in textbooks.

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Zero Mistakes

Avoid common errors in electron counting, formal charges, and bond placement with our validated algorithm.

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What is a Lewis Dot Structure?

A Lewis Structure (also called a Lewis dot structure, electron dot diagram, or Lewis dot diagram) is a graphical representation of the valence electrons in a molecule or polyatomic ion. It uses lines to represent shared electron pairs (bonds) and dots to represent non-bonding lone pairs, giving a complete picture of how atoms are connected and where electrons reside. Our lewis dot structure generator automates this process for hundreds of molecules including organic chemistry compounds.

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Bonding Pairs: A single line represents a single bond (2 shared electrons), a double line represents a double bond (4 shared electrons), and a triple line represents a triple bond (6 shared electrons).

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Lone Pairs: Pairs of dots placed on an atom represent non-bonding valence electrons not involved in any bond.

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Radical Dots: A single dot next to an atom indicates an unpaired electron (free radical).

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How to Draw Lewis Structures Online: Step-by-Step Guide

1

Count Valence Electrons

Calculate total valence electrons. Carbon (Group 14) has 4, Oxygen (Group 16) has 6. Total = 4 + (2×6) = 16 e⁻.

2

Determine Central Atom

Carbon is less electronegative than Oxygen, so it's central: O-C-O

3

Draw Single Bonds

Connect each oxygen to carbon with a single bond: 2 bonds × 2 e⁻ = 4 e⁻ used. Remaining = 12 e⁻.

4

Add Lone Pairs to Outer Atoms

Place remaining electrons on oxygen to satisfy their octet. Each needs 6 more e⁻ (3 lone pairs).

5

Check Central Atom Octet

Carbon has only 4 e⁻ (needs 8). Form double bonds: O=C=O

6

Verify Final Structure

Check that all atoms satisfy the octet rule and calculate formal charges.

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Frequently Asked Questions

Why do some atoms expand their octet? expand_more
Elements in period 3+ can use d-orbitals, allowing more than 8 electrons (e.g., PCl₅ has 10).
What is Formal Charge? expand_more
A theoretical charge calculated by: FC = V - (L + B/2), where V = valence electrons, L = lone pairs, B = bonding electrons.
How do I use the Lewis Structure Generator? expand_more
Enter your chemical formula and click "Generate". The tool accepts standard notation, ions, and functional groups.
Does this tool support charged ions? expand_more
Yes! Input ions using notation like SO4 2- or NH4 +.
What molecules are supported? expand_more
We support a vast range from simple diatomic gases to complex organic compounds, including acids, salts, hydrocarbons, and expanded octets.
Can I see resonance structures? expand_more
Currently shows the most stable resonance contributor based on formal charge minimization.
Is the VSEPR theory applied here? expand_more
Yes, molecular geometry and bond angles are calculated using VSEPR theory.
What does "Hybridization" mean? expand_more
Mixing of atomic orbitals to form new hybrid orbitals (e.g., sp³ in tetrahedral CH₄, sp² in trigonal planar BF₃).
Is this tool free to use online? expand_more
Absolutely! This is a completely free online Lewis structure generator — no signup, no download, no credit card required. Just enter your formula and draw Lewis structures instantly in your browser.
Can I use this as a Lewis dot structure calculator for chemistry homework? expand_more
Yes. This Lewis dot structure calculator automatically counts valence electrons, places lone pairs, forms the correct bonds, and shows molecular geometry — covering everything needed for general chemistry, AP Chemistry, and organic chemistry assignments.
Does it work as a molecular geometry generator? expand_more
Yes. For every molecule, this tool also acts as a molecular geometry generator using VSEPR theory — displaying bond angles, hybridization (sp, sp², sp³, sp³d, sp³d²), and 3D shape names like linear, bent, trigonal planar, tetrahedral, and octahedral.
Does it support organic chemistry Lewis structures? expand_more
Yes. Our organic chemistry Lewis structure generator supports alkanes, alkenes, alkynes, alcohols, aldehydes, ketones, amines, and halides — including methane, ethylene, acetylene, methanol, ethanol, and more. Complex molecules not in the local database are fetched from PubChem automatically.
How is this different from other Lewis structure drawers online? expand_more
Unlike basic Lewis structure drawers, this tool also shows valence electron count, formal charge, molar mass, element composition, bond angle, hybridization, and molecular geometry — all in one place. It also integrates with PubChem for molecules not in the local database, making it a complete lewis structure checker and solver.

Ready to Master Lewis Structures?

Join 50,000+ students who've already improved their chemistry grades. Start drawing accurate Lewis dot structures in seconds—completely free.

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