Percent Composition Calculator
Calculate mass percentage of each element in a compound from its formula.
% Element = (Mass of Element / Molar Mass) * 100
What is Percent Composition Calculator?
Calculate mass percentage of each element in a compound from its formula. Designed for chemistry students, researchers, and lab engineers for fast, verified calculations.
Formula & Calculation Method
How to Calculate
- Identify the given numbers from your chemistry problem.
- Enter values into the input fields above.
- The calculator updates results automatically in real time.
Related Chemistry Calculators
Explore complementary calculators to solve mass, mole, concentration, and stoichiometry problems:
Frequently Asked Questions
How does Percent Composition Calculator work?
Calculate mass percentage of each element in a compound from its formula.
What is the formula?
% Element = (Mass of Element / Molar Mass) * 100
Explore All 25 Free Chemistry Calculators
Access our complete suite of instant, accurate chemistry calculators for lab, research, and coursework.
⚖ 1. Mass & Mole Calculators
Convert mass in grams to moles using chemical formula or molar mass.
Open Calculator →Convert moles to mass in grams given compound molar mass.
Open Calculator →Calculate mass, moles, or molar mass interchangeably.
Open Calculator →Find compound molecular weight from chemical formula lookup.
Open Calculator →Calculate molecular mass in g/mol and Daltons.
Open Calculator →Convert mass in grams directly to total number of molecules.
Open Calculator →Convert grams to number of atoms using Avogadro's constant.
Open Calculator →🧬 2. Molecular Mass & Unit Converters
Convert moles to molecular particle count.
Open Calculator →Calculate particle counts from moles using 6.022 × 10²³.
Open Calculator →Convert kilodaltons (kDa) to g/mol (1 kDa = 1,000 g/mol).
Open Calculator →Convert molar mass in g/mol to kilodaltons (kDa).
Open Calculator →Convert Daltons (Da) to g/mol (1 Da = 1 g/mol).
Open Calculator →Convert molar mass in g/mol to Daltons (Da).
Open Calculator →Convert g/mol to kg/kmol (1:1 numerical ratio).
Open Calculator →Convert g/mol to mg/mmol (1:1 numerical ratio).
Open Calculator →💧 3. Concentration & Solution Calculators
Calculate molar concentration (mol/L) from moles/mass and volume.
Open Calculator →Convert mass concentration in g/L to molarity (mol/L).
Open Calculator →Convert g/mL mass density concentration to molarity.
Open Calculator →Calculate molality (mol/kg solvent) for colligative properties.
Open Calculator →Solve solution dilutions using C1V1 = C2V2 equation.
Open Calculator →⚖ 4. Stoichiometry & Reaction Calculators
Calculate mole ratios, reactant masses, and product yields.
Open Calculator →Determine empirical and molecular formulas from percent composition.
Open Calculator →Calculate mass percentage of elements in any chemical formula.
Open Calculator →Identify the limiting reagent and excess reactant remaining.
Open Calculator →