Essential tools for chemical analysis and molecular calculations
Advanced calculators for chemistry professionals, students, and researchers
Our chemistry calculators are designed for students, educators, and professionals in chemistry and related fields. These tools help you perform complex chemical calculations with precision and accuracy, from atomic structure analysis to molecular composition calculations.
Professional-grade calculators for atomic structure, properties, and composition analysis.
Get accurate results for chemical formulas, molecular weights, and composition analysis.
Essential tools for chemical experiments, calculations, and scientific analysis.
Calculate the air-fuel ratio (AFR) for complete combustion of common fuels. Select a fuel such as methane, propane, or hydrogen to see its stoichiometric AFR, or enter the mass of air and fuel to find the missing value.
Calculate atomic properties including protons, neutrons, electrons, atomic number and mass number
Calculate the atom economy of any chemical reaction from the masses or molecular weights of the reagents and the desired product. See how much of your reactants end up in the product and how much becomes waste.
Calculate atomic mass from protons and neutrons. Get atomic mass in various units including atomic mass units (u), kilograms, and more.
Calculate the average atomic mass of an element based on the isotopes and their natural abundances.
Calculate moles, mass, molecular weight, and number of atoms using Avogadro's number (Nₐ = 6.02214076 × 10²³). Bidirectional stoichiometry calculator with metric and imperial mass units.
Calculate the effective nuclear charge Z_eff of any electron using Slater’s rules. Pick an element and an orbital to see the total shielding and effective charge for all 118 elements.
Get the electron configuration for any element from the periodic table. View atomic number, atomic mass, and valence electrons.
Calculate electronegativity difference between two elements and determine bond type (ionic, polar covalent, or nonpolar covalent).
Calculate the empirical formula of a compound from percent composition or mass data. Enter up to 10 elements with their percentages or masses to find the simplest whole-number ratio.
Convert mass concentration (g/L, kg/L, mg/L) to molar concentration (M, mM, μM) and vice versa using molar mass.
Calculate the molal concentration of a solution from moles of solute and mass of the solvent. Converts between mass, molar mass, and moles with metric and imperial units.
Calculate the molar mass of any chemical compound by selecting up to six elements and their quantities.
Calculate the molar mass of a gas using the ideal gas law. Enter pressure, volume, temperature, and mass to find moles and molar mass with bidirectional solving.
Calculate solution molarity from mass, volume, and molecular weight. Converts between molar, millimolar, micromolar, and other concentration units with bidirectional solving.
Convert between mass, molecular weight, moles, and number of molecules for any chemical substance. Bidirectional stoichiometry calculator with 13 mass units, 4 molar mass units, 5 mole units, and 7 scientific notation scales.
Calculate the mole fraction of a solution from solute and solvent moles. Convert between mole fraction, mole percent, and molality with support for multiple mole and mass units.
Calculate the molecular weight of any compound by selecting up to six elements and their atom counts.
Convert between number of moles and number of atoms using Avogadro’s constant. Supports scientific notation and mole sub-units from pmol to mol.
Calculate the percent composition of each element in a chemical compound by mass. Select up to five elements, enter their atom counts, and see element masses, molecular weight, and percent composition instantly.
Calculate the percent ionic character of a chemical bond from the electronegativity difference (Pauling’s formula) or from the measured and calculated dipole moments. Pick two elements or enter dipole data to classify a bond as covalent, polar covalent, or ionic.
Calculate the pKa of an acid from pH using the Henderson-Hasselbalch equation, or directly from the acid dissociation constant (Ka). Supports molar concentration units from M to yM.
Choose a calculator above and start exploring the world of chemistry with precision and accuracy.
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