Chemistry
Free chemistry calculators for molarity, pH, stoichiometry, dilution, and molar mass. Accurate lab tools for students, teachers, and professionals.
Acids & Bases
More tools
Air-Fuel Ratio (AFR) Calculator
Air-fuel ratio calculator for AFR, lambda, and equivalence ratio from air and fuel mass, with stoichiometric mixture comparisons.
Actual Yield Calculator
Actual yield calculator for converting theoretical yield and percent yield into expected product mass, with fast chemistry experiment results.
Activity Coefficient Calculator
Activity coefficient calculator using ionic strength, ion charge, and the Davies equation for aqueous solution thermodynamics with instant results.
Buffer pH Calculator
Buffer pH calculator applies the Henderson-Hasselbalch equation to pKa and acid-base concentrations for fast, transparent solution results.
Buffer Capacity Calculator
Buffer capacity calculator estimates resistance to pH change from weak acid and conjugate base concentrations for quick solution analysis.
Bond Order Calculator
Bond order calculator uses bonding and antibonding electron counts from molecular orbital theory to assess bond strength and stability instantly.
Boiling Point Elevation Calculator
Boiling point elevation calculator uses molality, the ebullioscopic constant, and Van't Hoff factor to find temperature rise and solution boiling point.
Boiling Point Calculator
Boiling point calculator estimates a liquid's boiling temperature at a new pressure with the Clausius-Clapeyron equation for instant results.
Effective Nuclear Charge Calculator
Effective nuclear charge calculator finds Zeff from atomic number and shielding constant for fast atomic structure and periodic trend analysis.
Double Bond Equivalent Calculator for Unsaturation
Double bond equivalent calculator finds degrees of unsaturation from a molecular formula to identify likely rings and pi bonds instantly.
Dilution Factor Calculator for Solution Preparation
Dilution factor calculator finds the concentration ratio and sample-to-diluent relationship for accurate laboratory solution preparation.
Diffusion Coefficient Calculator with Stokes-Einstein
Diffusion coefficient calculator applies the Stokes-Einstein equation using temperature, viscosity, and particle radius for instant results.
Detention Time Calculator for Tank Flow
Detention time calculator finds hydraulic retention time from tank volume and flow rate for fast water treatment and reactor sizing.
Grams to Moles Calculator
Grams to moles calculator converts sample mass using molar mass and estimates molecules, atoms, ions, or formula units with instant results.
Gibbs Phase Rule Calculator
Gibbs phase rule calculator finds thermodynamic degrees of freedom from components, phases, temperature, and pressure constraints instantly.
Gibbs Free Energy Calculator
Gibbs free energy calculator finds delta G from enthalpy, entropy, temperature, or equilibrium constant and identifies reaction spontaneity.
Freezing Point Depression Calculator
Freezing point depression calculator uses molality, Kf, and the Van't Hoff factor to find temperature reduction and solution freezing point instantly.
Equilibrium Constant Calculator for Kc and Kp
Equilibrium constant calculator finds Kc or Kp from activity terms and converts pressure and concentration constants with clear instant results.
Mixing Ratio Calculator for Chemical Mixtures
Mixing ratio calculator simplifies mass, mole, or volume proportions and finds each component percentage for quick chemical mixture planning.
Miller Indices Calculator for Crystal Planes
Miller indices calculator converts crystal plane intercepts into normalized (h k l) indices for fast crystallography and lattice analysis.
Michaelis-Menten Equation Calculator
Michaelis-Menten equation calculator finds enzyme reaction velocity or substrate concentration from Vmax and Km with immediate results.
Mass Percent Calculator for Solutions and Mixtures
Mass percent calculator finds percent by mass and mass fraction for components in chemical solutions or mixtures with clear instant results.
Liquid Ethylene Density Calculator by Temperature
Liquid ethylene density calculator estimates C2H4 density from cryogenic temperature in g/cm³ and kg/m³ for fast process calculations.
Theoretical Yield Calculator for Chemical Reactions
Theoretical yield calculator converts limiting reactant mass and stoichiometric ratios into maximum product moles and grams with clear steps.
TDS Calculator for Total Dissolved Solids in Water
TDS calculator estimates total dissolved solids from conductivity or residue mass and water volume for quick water quality analysis.
STP Calculator for Gas Volume, Mass and Moles
STP calculator converts gas moles into volume, mass, and particle count at 0 °C and 1 atm using ideal gas and Avogadro relationships.
Solution Dilution Calculator for Concentration and Volume
Solution dilution calculator solves concentration and volume with the C1V1 equation, helping prepare accurate laboratory mixtures instantly.
Serial Dilution Calculator for Lab Concentrations
Serial dilution calculator finds every stepwise concentration from a stock value, dilution factor, and step count for fast laboratory planning.
Water Hardness Calculator
Water hardness calculator converts calcium and magnesium levels to mg/L as CaCO₃, grains per gallon, and a clear hardness classification.
Vapor Pressure of Water Calculator
Vapor pressure of water calculator finds saturation pressure by temperature in kPa, mmHg, bar, or psi using a proven Antoine correlation.
Vapor Pressure Calculator
Vapor pressure calculator applies the Clausius-Clapeyron equation using temperature and enthalpy of vaporization for quick pressure estimates.
Two-Photon Absorption Calculator
Two-photon absorption calculator estimates molecular excitation rate from GM cross-section, laser intensity, and wavelength with instant results.
Titration Calculator
Titration calculator finds unknown molarity or volume using acid-base stoichiometry and balanced coefficients for fast, reliable lab results.
Young-Laplace Equation Calculator
Young-Laplace equation calculator for pressure difference, surface tension, and curved-interface radius calculations with clear SI results.
Rate of Effusion Calculator
Rate of effusion calculator applies Graham's law to compare gas speeds from molar masses and a known effusion rate for instant, clear results.
Reaction Quotient Calculator
Reaction quotient calculator finds Q from reactant and product activities with stoichiometric coefficients for fast equilibrium direction checks.
Reconstitution Calculator
Reconstitution calculator finds medication concentration and dose volume from vial strength, diluent, and desired dose for a clear preparation check.
Resuspension Calculator
Resuspension calculator converts dry material amount and target concentration into solvent volume for accurate oligo and laboratory stock preparation.
Saponification Value Calculator
Saponification value calculator converts blank and sample titration data into mg KOH per gram for fast fat, oil, and quality-control analysis.
Percent Solution Calculator
Percent solution calculator finds weight/volume concentration from solute mass and solution volume for fast, accurate chemistry preparation.
Percent Yield Calculator
Percent yield calculator compares actual and theoretical yield to measure chemical reaction efficiency with a clear formula and instant result.
Percentage Concentration to Molarity Calculator
Percentage concentration to molarity calculator converts weight or volume percent using molar mass and density for reliable solution analysis.
pKa Calculator for Acid Dissociation and Buffers
pKa calculator converts Ka and pKa or applies Henderson-Hasselbalch to find buffer pH and acid-base ratio with transparent, instant results.
PPM to Molarity Calculator
PPM to molarity calculator converts mg/L concentration with molar mass and optional solution volume to deliver mol/L and total moles instantly.
Protein Solubility Calculator for Buffer Optimization
Protein solubility calculator estimates soluble concentration from pH, pI, salt, temperature, and hydrophobicity for faster buffer optimization.
Radioactive Decay Calculator for Isotope Half-Life
Radioactive decay calculator finds remaining isotope amount, decayed quantity, and decay constant from half-life and elapsed time instantly.
Radiocarbon Dating Calculator for Carbon-14 Age
Radiocarbon dating calculator estimates sample age from measured and initial carbon-14 activity, with adjustable half-life and clear decay steps.
Raoult’s Law Calculator for Ideal Vapor Pressure
Raoult’s law calculator finds mole fractions, partial pressures, and total vapor pressure for ideal multicomponent liquid mixtures instantly.
Rate Constant Calculator for Chemical Kinetics
Rate constant calculator solves Arrhenius, first-order, and second-order kinetics from activation energy or concentration-time data with clear steps.
Normality Calculator for Solution Concentration
Normality calculator finds equivalents per liter from solute mass, molar mass, reaction factor, and solution volume for reliable lab preparation.
Osmotic Pressure Calculator
Osmotic pressure calculator applies the van't Hoff equation to molarity, temperature, and dissociation factor for fast solution pressure results.
Partial Pressure Calculator
Partial pressure calculator uses Dalton's law with component moles, total moles, and mixture pressure to deliver mole fraction and gas pressure.
Percent Composition Calculator
Percent composition calculator converts component and total mass into mass percent for compounds, mixtures, and samples with instant clear results.
Percent Ionic Character Calculator
Percent ionic character calculator uses Pauling electronegativity difference to estimate bond polarity and ionic contribution with clear results.
Mole Calculator for Mass, Particles and Gas Volume
Mole calculator converts mass and molar mass into moles, particle count, and ideal-gas volume at STP for fast, accurate chemistry results.
Mole Fraction Calculator for Mixtures
Mole fraction calculator finds component fractions and mole percentages from mixture amounts for quick solution composition analysis.
Molecular Weight Calculator for Chemical Formulas
Molecular weight calculator finds molar mass and element contributions from chemical formulas with parentheses for clear, instant results.
Nernst Equation Calculator for Electrode Potential
Nernst equation calculator finds electrode potential from standard voltage, temperature, electrons, and reaction quotient with clear results.
Neutralization Calculator for Acid-Base Titration
Neutralization calculator finds acid-base concentration from molarity, titration volumes, and equivalence factors for reliable lab results.
Molality Calculator for Solution Concentration
Molality calculator finds solution concentration from solute mass, molar mass, and solvent mass, delivering mol/kg results for reliable lab work.
Molar Mass Calculator for Chemical Formulas
Molar mass calculator parses chemical formulas, subscripts, and grouped atoms to return molecular weight in g/mol for faster stoichiometry.
Molar Mass of Gas Calculator
Molar mass of gas calculator uses gas density, temperature, and pressure with the ideal gas law to estimate molecular weight for quick identification.
Molar Ratio Calculator for Stoichiometry
Molar ratio calculator converts known moles using balanced-equation coefficients for accurate stoichiometry and dependable reaction planning.
Molarity Calculator for Solution Concentration
Molarity calculator converts solute mass, molar mass, and solution volume into molar concentration for accurate laboratory preparation.
Ionic Strength Calculator for Solutions
Ionic strength calculator combines ion concentration and charge to analyze electrolytes, activity effects, and solution chemistry instantly.
Isoelectric Point Calculator for Proteins
Isoelectric point calculator estimates protein pI and peptide net charge from amino acid sequence and target pH for fast lab planning.
Kp Calculator for Gas Equilibrium Constants
Kp calculator finds gas equilibrium constants from partial pressures and converts Kp to Kc using temperature and mole change with clear results.
Langmuir Isotherm Calculator for Adsorption
Langmuir isotherm calculator solves adsorption capacity, adsorbed amount, affinity constant, or equilibrium concentration with clear results.
Lattice Energy Calculator for Ionic Solids
Lattice energy calculator uses Born-Landé crystal data or a Born-Haber cycle to estimate ionic lattice enthalpy with transparent results.
Half-Life Calculator for Radioactive Decay
Half-life calculator finds radioactive decay, remaining quantity, and decay constant from elapsed time with fast, accurate results.
Heat of Combustion Calculator for Fuel Energy
Heat of combustion calculator converts calorimetry data into fuel energy in kJ/g and molar enthalpy in kJ/mol for clear lab results.
Henderson-Hasselbalch Calculator for Buffer pH
Henderson-Hasselbalch calculator finds buffer pH from pKa and acid-base concentrations, with the ratio shown for fast solution planning.
Hydraulic Retention Time Calculator
Hydraulic retention time calculator finds tank and reactor HRT from volume and flow rate in metric or US units for quick process checks.
Hydrogen Ion Concentration Calculator
Hydrogen ion concentration calculator converts pH, pOH, [H+], and [OH-] for acid-base and water chemistry with instant clear results.
Enzyme Activity Calculator for Biochemical Assays
Enzyme activity calculator converts product formation, assay time, and enzyme volume into total activity and units per milliliter instantly.
Entropy Calculator for Thermodynamic Heat
Entropy calculator finds thermodynamic entropy change from reversible heat and absolute temperature, with correct conversion to joules per kelvin.
Electronegativity Calculator for Bond Polarity
Electronegativity calculator compares Pauling values to find electronegativity difference, bond polarity, and likely bond type instantly.
Electron Configuration Calculator for Atomic Orbitals
Electron configuration calculator fills atomic orbitals from atomic number using the Aufbau order, giving clear predicted notation instantly.
Electrolysis Calculator - Faraday's Law
Electrolysis calculator applies Faraday's law to find deposited mass, charge, current, or reaction time with precise, transparent results.
Degree of Unsaturation Calculator
Degree of unsaturation calculator finds IHD and DBE from a molecular formula or atom counts, revealing ring and pi-bond possibilities instantly.
Cubic Unit Cell Calculator
Cubic unit cell calculator finds crystal density, atomic radius, cell volume, atoms per cell, and packing factor for SC, BCC, and FCC.
Crude Protein Calculator
Crude protein calculator converts measured nitrogen into protein percentage and mass using custom Kjeldahl factors for reliable food and feed checks.
Concentration Calculator
Concentration calculator finds molarity, molality, percent solution, and ppm from mass, volume, and molar mass with clear instant results.
Combustion Reaction Calculator
Combustion reaction calculator balances fuel equations and finds oxygen demand, CO2, and water products for fast, accurate stoichiometry.
Calibration Curve Calculator for Lab Analysis
Calibration curve calculator fits linear regression, reports slope and R squared, and finds unknown sample concentration with transparent results.
Cell EMF Calculator with Nernst Equation
Cell EMF calculator applies standard electrode potentials and the Nernst equation to find electrochemical cell voltage under any conditions.
Chemical Name Calculator and Formula Lookup
Chemical name calculator converts common formulas to names and names to formulas, with compound classification for quick chemistry reference.
Chemical Oxygen Demand Calculator for Water
Chemical oxygen demand calculator finds COD from blank and sample titration data for fast, transparent water and wastewater quality analysis.
Combustion Analysis Calculator for Empirical Formula
Combustion analysis calculator finds elemental composition, empirical formula, and molecular formula from product masses with clear results.
Alligation Calculator for Mixture Ratios
Alligation calculator finds solution mixing ratios and exact amounts from lower, higher, and target concentrations for quick, accurate blending.
Arrhenius Equation Calculator for Rate Constants
Arrhenius equation calculator finds rate constants, activation energy, and frequency factors for fast, accurate chemical kinetics analysis.
Atom Calculator for Structure and Isotopes
Atom calculator finds protons, neutrons, electrons, isotope-weighted atomic mass, and mole or particle conversions with clear results.
Atom Economy Calculator for Green Chemistry
Atom economy calculator measures reaction efficiency from reactant and product molar masses, helping compare greener synthesis routes instantly.
Atomic Mass Calculator for Isotope Averages
Atomic mass calculator finds isotope-weighted average atomic mass from masses and abundances, with optional proton and neutron counts.
Average Atomic Mass Calculator
Average atomic mass calculator finds isotope-weighted atomic mass from isotope masses and percent abundances for fast, accurate chemistry results.
Avogadro's Number Calculator
Avogadro's number calculator converts moles, particles, and mass using the Avogadro constant and molar mass for instant chemistry answers.
Beer-Lambert Law Calculator
Beer-Lambert law calculator finds absorbance, concentration, path length, or molar absorptivity for fast spectrophotometry analysis.
Bleach Dilution Calculator
Bleach dilution calculator finds exact bleach and water volumes from stock strength, target concentration, and final volume for safer mixing.
Boiling Point at Altitude Calculator
Boiling point at altitude calculator estimates water temperature from elevation in meters or feet for better high-altitude cooking and planning.