Is my billing data or employee count stored anywhere?

No. All calculations happen entirely in your browser using JavaScript. No data is ever sent to our servers, stored in a database, or shared with third parties.

How accurate are the carbon estimates?

The estimates use industry-average emission factors from the Cloud Carbon Footprint project (2024) and EPA 2025 data. They are suitable for directional ESG reporting, not for ISO 14064-certified accounting.

Can I use these results in a sustainability report?

Yes, with the disclosure that results are browser-based estimates using Cloud Carbon Footprint and EPA methodology. For audited GHG reports, supplement with vendor-issued Scope 3 data.

Does the tool work offline?

Yes. Once the page has loaded, all calculations run locally in your browser with no internet connection required. Eco-Metrics is fully offline-capable.

Molar Mass Calculator & Eco-Metrics — Free Science Calculators

Estimate your cloud carbon footprint and remote work energy impact.

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Chemical Formula

Try an example:

What Is Molar Mass?

Molar Mass vs. Molecular Weight

Molar mass (g/mol) is the mass of one mole (6.022 × 10²³) of a substance. It is numerically equal to the molecular weight in atomic mass units (u), but expressed with units g/mol for practical lab calculations.

How to Read a Chemical Formula

Subscript numbers after an element symbol (like H₂O) indicate how many atoms of that element are in one molecule. Parentheses (like Ca(OH)₂) group elements — the subscript after the closing bracket multiplies everything inside.

IUPAC Atomic Weights — Our Data Source

Atomic masses in this tool come from the IUPAC 2021 standard atomic weights (Commission on Isotopic Abundances and Atomic Weights). Values are updated as natural isotope abundances are refined.

Stoichiometry in 30 Seconds

Knowing the molar mass lets you convert between grams and moles: moles = mass (g) ÷ molar mass (g/mol). This is the foundation of all reaction stoichiometry calculations.

Frequently Asked Questions

What is the difference between molar mass and molecular weight?

They are numerically the same. Molecular weight is dimensionless (expressed in atomic mass units, u). Molar mass has SI units of g/mol and is used in practical chemistry calculations.

How do I enter a formula with parentheses?

Use standard chemical notation: Ca(OH)2, Al2(SO4)3, Cu(NO3)2. The calculator handles nested parentheses up to 3 levels deep.

Which atomic masses are used?

The tool uses IUPAC 2021 standard atomic weights. For elements with no stable isotopes (like Tc, Po), the mass of the most stable isotope is used, marked with an asterisk.

Can I calculate the molar mass of an ionic compound?

Yes. Enter the formula unit as written: NaCl, CaCO3, Fe2O3. The calculator sums all atomic masses in the formula unit regardless of ionic or covalent bonding.