Chemistry Calculators
Solve chemical equations, molarity, gas laws, thermodynamics, and stoichiometry.
Molar Mass Calculator
Calculate the molar mass of a compound from atomic masses
Molar Mass (Advanced)
Calculate molar mass with more elements
Moles from Mass
Calculate moles from mass and molar mass
Mass from Moles
Calculate mass from moles and molar mass
Percent Composition
Calculate mass percent of each element
Empirical Formula (from percents)
Find empirical formula from mass percentages
Limiting Reactant
Determine the limiting reactant in a reaction
Theoretical Yield
Calculate theoretical yield from limiting reactant
Percent Yield
Calculate percent yield of a reaction
Molarity
Calculate molarity, moles, or volume
Dilution (M₁V₁ = M₂V₂)
Calculate dilution concentration or volume
Molality
Calculate molality of a solution
Parts Per Million (PPM)
Calculate concentration in ppm
Enthalpy of Reaction (ΔH)
Calculate enthalpy change using standard enthalpies
Gibbs Free Energy (ΔG)
Calculate Gibbs free energy change
Entropy Change (ΔS)
Calculate entropy change
Calorimetry (q = mcΔT)
Calculate heat absorbed or released
Bond Energy
Estimate ΔH using bond energies
Hess's Law
Calculate ΔH from multiple reaction steps
Heat of Combustion
Calculate heat released from combustion
Standard Enthalpy of Formation
Calculate ΔH°f from standard data
Phase Change Energy
Calculate energy for phase transitions
First-Order Rate Law
Calculate concentration at time t for first-order reaction
Second-Order Rate Law
Calculate concentration at time t for second-order reaction
Arrhenius Equation
Calculate rate constant at a given temperature
Half-Life (First Order)
Calculate half-life of first-order reaction
Activation Energy (from k, T)
Calculate activation energy from rate constants
Equilibrium Constant (K)
Calculate equilibrium constant from concentrations
Reaction Quotient (Q)
Calculate Q to predict reaction direction
Solubility Product (Ksp)
Calculate Ksp from solubility
ICE Table (Simple)
Calculate equilibrium concentrations
pH Calculator
Calculate pH from H⁺ concentration
[H₃O⁺] from pH
Calculate hydronium concentration from pH
Henderson-Hasselbalch
Calculate pH of a buffer solution
Ka from pH
Calculate acid dissociation constant from pH
Weak Base pH
Calculate pH of a weak base solution
Buffer Capacity
Calculate buffer capacity against added acid/base
Titration (Strong Acid/Base)
Calculate volume needed for neutralization
Polyprotic Acid Speciation
Dominant species at given pH
Standard Cell Potential (E°)
Calculate standard cell potential
Nernst Equation
Calculate cell potential at non-standard conditions
Faraday's Law (Mass Deposited)
Calculate mass of substance deposited in electrolysis
Conductivity & Molar Conductivity
Calculate molar conductivity
ΔG from Cell Potential
Calculate Gibbs free energy from cell potential
Ideal Gas Law (PV = nRT)
Calculate P, V, n, or T for ideal gases
Combined Gas Law
Calculate P₂, V₂, or T₂
Dalton's Law (Partial Pressures)
Calculate total pressure or partial pressure
RMS Speed of Gas
Calculate root mean square speed
Graham's Law (Effusion)
Compare effusion rates of two gases
Radioactive Decay
Calculate remaining isotope after decay
Carbon-14 Dating
Calculate age from C-14 remaining
Beer-Lambert Law (A = εbc)
Calculate concentration from absorbance
LOD & LOQ
Calculate limits of detection and quantification
Retention Factor (TLC)
Calculate Rf in thin-layer chromatography
Chromatographic Resolution
Calculate resolution between two peaks
Degree of Unsaturation (DoU)
Calculate double bond equivalents from formula
Enantiomeric Excess
Calculate enantiomeric purity
Elemental Analysis
Calculate %C, %H from combustion data
Synthetic Yield (Overall)
Calculate overall yield of multi-step synthesis
Lipinski's Rule of Five
Check drug-likeness using Rule of Five
NMR Chemical Shift Estimation
Estimate ¹H NMR chemical shift range
Periodic Trends Calculator
Calculate periodic trends (electronegativity, radius)
Isotopic Mass Calculator
Calculate average atomic mass from isotopic abundances
Oxidation Number Calculator
Assign oxidation numbers to elements
Formal Charge Calculator
Calculate formal charge on an atom
Solution Preparation
Calculate mass or volume needed for solution prep
Normality Calculator
Calculate normality from molarity
Half-Equivalence Point pH
Calculate pH at half-equivalence of weak acid titration
Buffer Ratio [A⁻]/[HA]
Find ratio for desired pH buffer
Half-Life (Zero Order)
Calculate half-life of zero-order reaction
Integrated Rate Law (Zero Order)
Calculate concentration at time t (zero order)
Electrolysis Time Calculator
Calculate time required for electrolysis
Quantum Yield (Photochemistry)
Calculate quantum yield of a photochemical reaction
Reaction Rate Constant
Calculate rate constant from concentration data
Atomic Absorption (Beer-Lambert)
Calculate concentration from atomic absorption
Titration Curve pH (Strong Acid + Strong Base)
Calculate pH during strong acid/strong base titration
Reduction Potential (from ΔG)
Calculate reduction potential from Gibbs free energy
Lattice Energy (Kapustinskii)
Estimate lattice energy using Kapustinskii equation
Polymer Dispersity (PDI)
Calculate PDI from number and weight average MW
Schotten-Baumann Yield
Calculate yield in Schotten-Baumann reaction
Crystal Field Splitting
Calculate crystal field stabilization energy (CFSE)
Mole Fraction
Calculate mole fraction and molality
Raoult's Law (Vapor Pressure)
Calculate vapor pressure of solution
Boiling Point Elevation
Calculate boiling point elevation
Freezing Point Depression
Calculate freezing point depression
Osmotic Pressure
Calculate osmotic pressure using van't Hoff equation
Arrhenius Equation (Two Points)
Calculate activation energy from two rate constants
Standard Free Energy (ΔG°)
Calculate standard Gibbs free energy change
van der Waals Equation
Calculate pressure using van der Waals equation
Conjugate Acid-Base Pair
Find pKa of conjugate acid from conjugate base pKb
Polyprotic Acid pH (Diprotic)
Calculate pH of diprotic acid solution
Autoionization of Water (Kw)
Calculate H⁺ and OH⁻ from Kw at T
Percent Error in Yield
Calculate percent error in experimental yield
Mass Percent Composition
Calculate mass percent of each element in a compound
pH of Strong Acid
Calculate pH of a strong acid solution
Oxidation Number Change (Redox)
Calculate electron transfer in redox reactions
Third-Order Rate Law (Integrated)
Calculate concentration for third-order reaction
Zero-Order Rate Law (Integrated)
Calculate concentration for zero-order reaction
Colligative Properties (Summary)
Calculate boiling point, freezing point, and osmotic pressure
Gas Volume at STP
Calculate volume of gas at STP from moles
Avogadro's Number Calculator
Calculate number of atoms/molecules from moles
Reconstitution Calculator
Calculate volume needed to reconstitute a powder to desired concentration
Water Hardness Calculator
Calculate water hardness as CaCO₃ equivalent
Bond Order Calculator
Calculate bond order from molecular orbital electron counts
Effective Nuclear Charge (Zeff)
Calculate Zeff using Slater's rules
Percent Ionic Character
Calculate % ionic character from electronegativity difference
Atom Economy Calculator
Calculate atom economy of a chemical reaction
Ionic Strength Calculator
Calculate ionic strength of a solution
Q10 Temperature Coefficient
Calculate Q10 temperature coefficient for reaction rates
Concentration Converter
Convert between % concentration, molarity, and ppm
Chemical Oxygen Demand (COD)
Calculate COD from dichromate consumption
Crude Protein Calculator (Kjeldahl)
Calculate crude protein from nitrogen content
Molar Ratio Calculator
Calculate molar ratios between reactants and products
Boiling Point at Altitude
Calculate water boiling point at different altitudes
Activity Coefficient (Debye-Hückel)
Calculate mean ionic activity coefficient
Saponification Value Calculator
Calculate saponification number for soap making
TDS from Conductivity
Calculate Total Dissolved Solids from electrical conductivity
Alligation Calculator
Calculate mixing ratio of two solutions to achieve target concentration
pKa / Ka Converter
Convert between Ka and pKa values
AFR Calculator (Air-Fuel Ratio)
Calculate stoichiometric air-fuel ratio from fuel composition
Atom Calculator
Calculate basic atom counts from atomic number and mass number.
Atomic Mass Calculator
Estimate atomic mass from protons and neutrons.
Average Atomic Mass Calculator
Calculate weighted average atomic mass from two isotopes.
Chemical Name Calculator
Estimate ionic compound subscripts from ion charges.
Electron Configuration Calculator
Estimate shell electron counts from atomic number.
Electronegativity Calculator
Calculate electronegativity difference and bond polarity estimate.
Quiz: Electron Configuration Calculator
Check electron totals across shells.
Grams to Moles Calculator
Convert grams to moles using molar mass.
Molar Mass of Gas Calculator
Calculate gas molar mass using the ideal gas law.
Mole Calculator
Convert between moles, mass, and particles.
Molecular Weight Calculator
Estimate molecular weight from C, H, N, O, and S atom counts.
Moles to Atoms Converter
Convert moles to atoms or formula units.
PPM to Molarity Calculator
Convert ppm concentration to molarity for dilute aqueous solutions.
Bleach Dilution Calculator
Calculate stock bleach volume for a target dilution.
Dilution Factor Calculator
Calculate dilution factor from stock and final volumes.
Mixing Ratio Calculator
Calculate mixture concentration from two solution volumes.
Neutralization Calculator
Calculate neutralization volume using equivalents.
Percent Solution Calculator
Calculate mass/volume percent solution.
Serial Dilution Calculator
Calculate final concentration after repeated dilutions.
Solution Dilution Calculator
Calculate final molarity after dilution.
Actual Yield Calculator
Calculate actual yield from percent yield and theoretical yield.
Chemical Equation Balancer
Balance hydrocarbon combustion from CxHyOz.
Kp Calculator
Convert Kc to Kp for gas reactions.
Net Ionic Equation Calculator
Estimate net ionic reacting equivalents after removing spectator amounts.
Rate Constant Calculator
Calculate a rate constant from rate law data.
Boiling Point Calculator
Estimate boiling point from vapor pressure using a simple Clausius-Clapeyron form.
Gibbs' Phase Rule Calculator
Calculate degrees of freedom for a phase system.
STP Calculator (Standard Temperature and Pressure)
Calculate gas volume at STP from moles.
Vapor Pressure Calculator
Estimate vapor pressure with the Antoine equation.
Vapor Pressure of Water Calculator
Estimate water vapor pressure from temperature.
Diffusion Coefficient Calculator
Estimate diffusion coefficient from mean squared displacement.
Langmuir Isotherm Calculator
Calculate surface coverage from Langmuir adsorption.
Two-Photon Absorption Calculator
Estimate two-photon absorption rate from intensity.
Young-Laplace Equation Calculator
Calculate pressure difference across a curved interface.
Combustion Analysis Calculator
Estimate empirical mole ratios from CO2 and H2O masses.
Combustion Reaction Calculator
Balance complete combustion for CxHyOz.
Liquid Ethylene Density Calculator
Estimate liquid ethylene density from mass and volume.
Calibration Curve Calculator
Calculate concentration from a linear calibration curve.
Enzyme Activity Calculator
Calculate enzyme activity from product formed over time.
Isoelectric Point Calculator
Estimate pI from acidic and basic pKa values.
Michaelis-Menten Equation Calculator
Calculate enzyme reaction velocity.
Protein Solubility Calculator
Estimate soluble protein mass from solubility and volume.
Resuspension Calculator
Calculate buffer volume for a target stock concentration.
Cubic Cell Calculator
Calculate cubic unit cell volume and density.
Detention Time Calculator
Calculate tank detention time from volume and flow.
Hydraulic Retention Time Calculator
Calculate hydraulic retention time.
Miller Indices Calculator
Convert intercepts to Miller index reciprocals.
Save Configuration Snapshot
Save current parameters to your dashboard for instant one-click reloading.
About This Calculator & Guide
About the Chemistrys — Molar Mass, Concentration & pH Calculator
The Chemistrys — Molar Mass, Concentration & pH Calculator is a specialized online utility designed to help you free online chemistry calculators for molar mass, stoichiometry, solution concentration, gas laws, and ph calculations. It performs calculations in real-time to provide immediate, reliable estimates for study, work, or daily tasks.
How to Use
Simply enter your parameters in the input fields of the calculator widget above. The tool evaluates the inputs instantly and displays the results in real-time. You can modify any value to check alternate scenarios and compare figures dynamically.
Data Privacy & Safety
All calculations are executed locally within your web browser. No inputs are sent to our servers or stored externally, ensuring your personal and financial details remain completely private and secure.
FAQ
Frequently Asked Questions
What does the Chemistry Calculators — Molar Mass, Concentration & pH do?+
Free online chemistry calculators for molar mass, stoichiometry, solution concentration, gas laws, and pH calculations. It is designed for quick everyday use and gives clear results without requiring a sign in.
Is the Chemistry Calculators — Molar Mass, Concentration & pH free to use?+
Yes. The Chemistry Calculators — Molar Mass, Concentration & pH is free to use online and works directly in your browser.
Can I use the Chemistry Calculators — Molar Mass, Concentration & pH on mobile?+
Yes. The calculator layout is responsive, so you can use it on phones, tablets, laptops, and desktop screens.