Is molar mass the same as molecular weight?

They are often numerically similar for a molecular formula, but molar mass is mass per amount of substance and is reported in g/mol. Molecular weight is traditionally a relative, unitless ratio.

Do parentheses change the atom count?

Yes. A subscript outside parentheses multiplies every atom inside them: Ca(OH)₂ has two oxygen atoms and two hydrogen atoms.

Which atomic masses does the calculator use?

It uses standard atomic-weight values for the elements in the entered formula. Your class may specify a rounded periodic table, which can cause small rounding differences.

Is the Molar Mass Calculator free to use?

Yes. Molar Mass Calculator on The Daily Tools is completely free, requires no account, and runs entirely in your browser.

Does The Daily Tools store my inputs?

No. Your numbers and text never leave your device. The Daily Tools has no backend database for calculator inputs.

Who should use the Molar Mass Calculator?

Anyone who needs a clear chemistry calculation and wants to check the assumptions used.

How accurate is the Molar Mass Calculator?

Results follow the standard formula shown on this page. They are estimates for planning — not a substitute for professional advice.

Can I use the Molar Mass Calculator on mobile?

Yes. The Daily Tools is fully responsive and works on phones, tablets, and desktops.

Molar Mass Calculator

Find molar mass from a chemical formula.

Private — runs in your browser Instant results

Chemical formula

Use element symbols and subscripts, e.g. H2SO4.

Molar mass

18.0150

g/mol

Formula H2O → 18.0150 g/mol

Enter any chemical formula and get its molar mass in g/mol with an element-by-element breakdown. Supports parentheses and subscripts for complex compounds. Use The Daily Tools' Molar Mass Calculator for private, browser-based processing — no account or server upload required.

What is Molar Mass Calculator?

Molar Mass Calculator helps you find molar mass from a chemical formula. Use it to check chemistry arithmetic after you have identified the substances, balanced equation, units, and assumptions that apply to your problem.

Definition: Molar Mass Calculator adds the atomic masses in a chemical formula and reports the result in grams per mole (g/mol).

Formula

M = Σ (atomic mass × atom count) for each element in the formula

Calculation steps

The core formula: M = Σ (atomic mass × atom count) for each element in the formula
Enter your values in the fields above — units and assumptions are under your control.
The Daily Tools computes the result instantly in your browser using JavaScript.
Review the result panel for the primary output and supporting breakdown values.

Worked example

Example: molar mass of calcium hydroxide, Ca(OH)₂

Inputs: Formula = Ca(OH)₂

Read the parentheses and subscript: Ca(OH)₂ contains 1 Ca, 2 O, and 2 H atoms.
Multiply each atomic mass by its atom count: Ca + 2(O) + 2(H).
Add the contributions and round only at the end.

Ca(OH)₂ has a molar mass of about 74.09 g/mol.

Use cases

Checking a basic chemistry calculation for coursework or lab preparation
Showing the formula, units, and intermediate quantities behind a result
Comparing a calculation with a balanced equation, data table, or measured value

Advantages

Browser-based processing — entered values and selected files are not sent to our servers
No account required
Instant results with a clean, readable interface
Transparent formula shown on this page

Limitations

Results depend on the formula, units, significant figures, and chemical data entered.
A calculator cannot determine whether a reaction equation, chemical formula, or experimental measurement is correct.
Use appropriate laboratory procedures, safety information, and instructor or supervisor guidance for real experiments.

Frequently asked questions

Is molar mass the same as molecular weight?: They are often numerically similar for a molecular formula, but molar mass is mass per amount of substance and is reported in g/mol. Molecular weight is traditionally a relative, unitless ratio.
Do parentheses change the atom count?: Yes. A subscript outside parentheses multiplies every atom inside them: Ca(OH)₂ has two oxygen atoms and two hydrogen atoms.
Which atomic masses does the calculator use?: It uses standard atomic-weight values for the elements in the entered formula. Your class may specify a rounded periodic table, which can cause small rounding differences.
Is the Molar Mass Calculator free to use?: Yes. Molar Mass Calculator on The Daily Tools is completely free, requires no account, and runs entirely in your browser.
Does The Daily Tools store my inputs?: No. Your numbers and text never leave your device. The Daily Tools has no backend database for calculator inputs.
Who should use the Molar Mass Calculator?: Anyone who needs a clear chemistry calculation and wants to check the assumptions used.
How accurate is the Molar Mass Calculator?: Results follow the standard formula shown on this page. They are estimates for planning — not a substitute for professional advice.
Can I use the Molar Mass Calculator on mobile?: Yes. The Daily Tools is fully responsive and works on phones, tablets, and desktops.

Sources & references

The Daily Tools Methodology

Key points

Molar Mass Calculator is a free, browser-based calculator for find molar mass from a chemical formula.
Formula: M = Σ (atomic mass × atom count) for each element in the formula
Private, browser-only processing
Private, browser-based processing