Empirical Formula Calculator

Determine the empirical formula of a chemical compound from element mass percentages or experimental mass data. Optionally compute the molecular formula using molar mass.

Free to useNo sign-up requiredUpdated Mar 2026

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6 C 12.011

1 H 1.008

8 O 15.999

→

CH₂O

Quick Examples

Element Data

⚗ Molecular (Molar) Mass — Optional

Enter the known molar mass to also determine the molecular formula.

g/mol

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About Empirical Formula Calculator

The Empirical Formula Calculator determines the simplest whole-number ratio of atoms in a chemical compound from mass percentages or experimental mass data. Enter your element data and instantly get the empirical formula, with an optional molecular formula calculation when the molar mass is known. Every result includes a detailed step-by-step solution showing exactly how the formula is derived.

How to Use the Empirical Formula Calculator

Select your input mode — choose "Mass Percentages (%)" if you have composition data in percent, or "Experimental Mass (g)" if you have lab measurements in grams.
Enter element data — for each element in the compound, type the element symbol (e.g., C, H, O, Na, Fe) and its mass percentage or mass value. Use the "+ Add Element" button if you need more rows.
Enter molecular mass (optional) — if you know the compound's molar mass, enter it in the optional field to also obtain the molecular formula.
Click Calculate — review the empirical formula, element breakdown cards, composition bar, and the full step-by-step derivation.

Understanding Empirical vs. Molecular Formulas

The empirical formula shows the simplest whole-number ratio of atoms in a compound. The molecular formula shows the actual number of atoms per molecule. They are related by a whole-number multiplier n:

$$\text{Molecular Formula} = n \times \text{Empirical Formula}$$ $$n = \frac{\text{Molecular Mass}}{\text{Empirical Formula Mass}}$$

Compound	Empirical	Molecular	n
Formaldehyde	CH₂O	CH₂O	1
Acetic acid	CH₂O	C₂H₄O₂	2
Glucose	CH₂O	C₆H₁₂O₆	6
Benzene	CH	C₆H₆	6
Hydrogen peroxide	HO	H₂O₂	2

Step-by-Step Method

Assume 100 g (for percentages) — this converts mass % directly to grams.
Convert to moles — divide each element's mass by its atomic mass: $\text{moles} = \frac{\text{mass (g)}}{\text{atomic mass (g/mol)}}$
Find the mole ratio — divide each mole value by the smallest one.
Clear fractions — if ratios aren't whole numbers, multiply all by the smallest integer that yields whole numbers (e.g., ×2 for 0.5, ×3 for 0.33).
Write the formula — the resulting whole numbers become the subscripts.

Common Multipliers for Fractional Ratios

If ratio ends in…	Multiply by	Example
0.5	2	1.5 × 2 = 3
0.33 or 0.67	3	1.33 × 3 = 4
0.25 or 0.75	4	1.25 × 4 = 5
0.2 or 0.4 or 0.6 or 0.8	5	1.4 × 5 = 7

Frequently Asked Questions

What is an empirical formula?

An empirical formula represents the simplest whole-number ratio of atoms of each element in a compound. For example, the empirical formula of glucose (C₆H₁₂O₆) is CH₂O, showing a 1:2:1 ratio of carbon to hydrogen to oxygen.

What is the difference between empirical and molecular formulas?

The empirical formula gives the simplest whole-number ratio of elements, while the molecular formula gives the actual number of atoms of each element in one molecule. For example, acetic acid has the empirical formula CH₂O and the molecular formula C₂H₄O₂. The molecular formula is always a whole-number multiple of the empirical formula.

How do you find the empirical formula from mass percentages?

To find the empirical formula from mass percentages: (1) Assume 100 g of the compound so percentages become grams, (2) Convert grams to moles by dividing each by the element's atomic mass, (3) Divide all mole values by the smallest to get the mole ratio, (4) If needed, multiply by a whole number to clear fractions, giving the subscripts for each element.

How do you determine the molecular formula from the empirical formula?

To determine the molecular formula, divide the compound's known molecular (molar) mass by the empirical formula mass. This gives a whole-number multiplier n. Multiply each subscript in the empirical formula by n to get the molecular formula. For example, if the empirical formula is CH₂O (mass 30 g/mol) and the molecular mass is 180 g/mol, then n = 6, giving the molecular formula C₆H₁₂O₆.

Can the empirical and molecular formula be the same?

Yes. When the multiplier n equals 1, the empirical and molecular formulas are identical. This happens when the molecular mass equals the empirical formula mass. Examples include water (H₂O), carbon dioxide (CO₂), and nitrogen dioxide (NO₂).

Related Chemistry Tools

Molar Mass Calculator — Calculate the molar mass of any chemical compound
Stoichiometry Calculator — Convert between moles, mass, and volume
Chemical Equation Balancer — Balance chemical equations automatically
Percent Yield Calculator — Calculate actual vs. theoretical yield
Molarity Calculator — Compute solution concentration

Reference this content, page, or tool as:

"Empirical Formula Calculator" at https://MiniWebtool.com/empirical-formula-calculator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Mar 16, 2026

Developer API available: Run this tool from your app, automation, or agent with one JSON HTTP request. View API docs