Molar Mass Calculator

Molecular weight from chemical formula with element breakdown

Quick Answer

Molar Mass Calculator: Molecular weight from chemical formula with element breakdown. M = Σ (atomic weight × count), IUPAC 2021 values.

Chemical formula

Mass in grams (optional → moles)

Molar mass

180.156 g/mol

24 atoms per formula unit

Molar mass180.156 g/mol

Atom count24

Element breakdown

Element	Count	Atomic wt	Subtotal	Mass %
C	×6	12.011	72.066	40.0%
H	×12	1.008	12.096	6.7%
O	×6	15.999	95.994	53.3%

Steps

1C: 6 × 12.011 = 72.066
2H: 12 × 1.008 = 12.096
3O: 6 × 15.999 = 95.994
4Total = 180.156 g/mol

💡 Supports nested brackets and hydrates (CuSO4·5H2O uses · or .). Common pitfalls: element symbols are case-sensitive (Co = cobalt, CO = carbon monoxide); hydrate water counts fully toward molar mass. Avogadro's number 6.022×10²³ converts moles ↔ particle counts.

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How to Use

Enter known quantities: fill values and confirm units in the Molar Mass Calculator.
Instant solution: unknowns solve live with the formula shown transparently.
Use constant/material tables: standard physical constants and material data are listed on this page.
Compare conditions: change inputs to compare scenarios.

Key Points

Molar Mass Calculator is a free online science & engineering tool — open and use, no sign-up.
All calculations run locally in your browser; your data never leaves the device.
Key capability: Molecular weight from chemical formula with element breakdown.
Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Molar mass

M = Σ (atomic weight × count), IUPAC 2021 values

Parentheses supported: Ca(OH)₂ = 40.078 + 2×(15.999+1.008) ≈ 74.09 g/mol

H₂SO₄ ≈ 98.07 g/mol · moles n = mass ÷ M

FAQ

How do I use the Molar Mass Calculator?

Open the page and fill in the input fields — results update automatically. Molecular weight from chemical formula with element breakdown.

Are the results accurate?

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?

Completely free. No registration, login or download required.

Does it work on mobile?

Yes. The responsive design works on phones, tablets and desktops.

Is my data saved?

No. Everything runs locally in your browser.

Related Guides

Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated: 2026-08-07

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Molar Mass Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/molar-mass

Results provided by this tool are for reference only and do not constitute professional advice.