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Empirical Formula Calculator

Science & Engineering

Element masses → mole ratio → simplest formula

Quick Answer

Empirical Formula Calculator: Element masses → mole ratio → simplest formula. Empirical Formula Calculator uses standard science & engineering formulas to compute accurate results instantly.

Element composition (one per line)

Percentages are treated as masses in a 100 g sample. Supported elements: H Li Be B C N O F Na Mg Al Si P S Cl K Ca Ti Cr Mn Fe Ni Cu Zn Br Ag Sn I Ba Pt Au Hg Pb

Empirical formula

Fe₂O₃

Fe2O3

Mole calculation

ElementMass (g)Atomic massMolesRatio
Fe69.955.8451.25171
O30.115.9991.88141.503

Steps

  1. 1Fe：n = 69.9 ÷ 55.845 = 1.2517 mol
  2. 2O：n = 30.1 ÷ 15.999 = 1.8814 mol
  3. 3以最小值 1.2517 mol 为基准求比值：Fe 1 : O 1.503
  4. 4比值化整（×2）：Fe 2 : O 3.006
  5. 5最简整数下标 → 实验式 Fe2O3
Multiplier applied×2
  • The empirical formula is the simplest whole-number atom ratio; the molecular formula is an integer multiple of it (need molar mass).
  • Percentage composition: treat each value as grams in a 100 g sample, then divide by atomic mass.
  • Ratios like 1 : 1.5 are doubled to 2 : 3; if the ratio cannot be simplified within ×8, double-check the data.
  • Atomic masses use IUPAC standard values, rounded appropriately for teaching.

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How to Use

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

Key Points

  • Empirical Formula 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: Element masses → mole ratio → simplest formula.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Empirical Formula Calculator formula

Empirical Formula Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Empirical Formula Calculator?
Open the page and fill in the input fields — results update automatically. Element masses → mole ratio → simplest formula.
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.

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Source & Updates

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

Last updated:

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

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Empirical Formula Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/empirical-formula

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