Empirical Formula Calculator

Use this empirical formula calculator to find the simplest whole number formula from composition data. Enter element amounts, masses or percentages and review an empirical formula and simplified ratio.

Element 1 mass %

Element 1 atomic mass

Element 2 mass %

Element 2 atomic mass

Element 3 mass % (0 if none)

Element 3 atomic mass

Mole ratio (approx.)

—

Moles per 100 g —

If the ratio doesn't look like whole numbers, multiply all values by 2, 3, or 4 until they do.

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How it works

Moles of each element = mass% ÷ atomic mass; divide all by the smallest to get the ratio

How to use the Empirical Formula Calculator

Start by entering element amounts, masses or percentages. Keep the units consistent and check that each value belongs to the same question.

The result gives an empirical formula and simplified ratio. Rounding should be checked when values are close to whole number ratios. Use it as a guide and check any instructions, rules or professional advice that apply.

Frequently Asked Questions

What does this empirical formula calculator calculate?

It gives an empirical formula and simplified ratio. Rounding should be checked when values are close to whole number ratios.

What information should I enter?

Enter element amounts, masses or percentages. Use the same units throughout so the result is easier to understand.

Is an empirical formula the molecular formula?

Not always. The molecular formula can be a whole number multiple of the empirical formula.

Empirical Formula Calculator

How it works

How to use the Empirical Formula Calculator

Frequently Asked Questions

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