Atomic Number Calculator
Instantly find the atomic number of any element. Learn how to calculate atomic number easily.
Enter an element name (Carbon), symbol (C), or number (6).
Searching periodic table...
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Element Properties
Find Any Element's Atomic Number Instantly
Type an element's name (Carbon), symbol (C), or number (6) and get its atomic number, symbol, and atomic mass instantly — a free periodic-table lookup for students, teachers, and chemists.
The lookup covers all 118 elements. Just enter what you know and the tool matches it against the full periodic table in a fraction of a second.
All 118 elements
Search the complete periodic table — from Hydrogen (1) to Oganesson (118) — by name, symbol, or atomic number.
Instant results
Results appear immediately with the element's number, symbol, name, and atomic mass.
Free study reference
Keep it open during homework or lab work as a quick, no-signup alternative to flipping through a printed periodic table.
How to use
- Type an element name, symbol, or atomic number.
- Click Calculate Atomic Number.
- Read the element's number, symbol, and atomic mass.
Frequently Asked Questions
What is an atomic number?
The atomic number is the number of protons in an atom's nucleus — it uniquely identifies each element (Hydrogen is 1, Helium is 2, and so on).
Can I search by symbol?
Yes. Enter a symbol like Fe to get Iron's atomic number 26, or enter 26 to get Fe.
Does it include atomic mass?
Yes. Each result shows the element's standard atomic mass alongside its number and symbol.
How many elements are covered?
All 118 confirmed elements of the periodic table.
Is it free?
Yes, completely free with no signup.
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