🧪

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

CHEM

Atom Calculator

Calculate basic atom counts from atomic number and mass number.

CHEM

Atomic Mass Calculator

Estimate atomic mass from protons and neutrons.

CHEM

Average Atomic Mass Calculator

Calculate weighted average atomic mass from two isotopes.

CHEM

Chemical Name Calculator

Estimate ionic compound subscripts from ion charges.

CHEM

Electron Configuration Calculator

Estimate shell electron counts from atomic number.

CHEM

Electronegativity Calculator

Calculate electronegativity difference and bond polarity estimate.

CHEM

Quiz: Electron Configuration Calculator

Check electron totals across shells.

CHEM

Grams to Moles Calculator

Convert grams to moles using molar mass.

CHEM

Molar Mass of Gas Calculator

Calculate gas molar mass using the ideal gas law.

CHEM

Mole Calculator

Convert between moles, mass, and particles.

CHEM

Molecular Weight Calculator

Estimate molecular weight from C, H, N, O, and S atom counts.

CHEM

Moles to Atoms Converter

Convert moles to atoms or formula units.

CHEM

PPM to Molarity Calculator

Convert ppm concentration to molarity for dilute aqueous solutions.

CHEM

Bleach Dilution Calculator

Calculate stock bleach volume for a target dilution.

CHEM

Dilution Factor Calculator

Calculate dilution factor from stock and final volumes.

CHEM

Mixing Ratio Calculator

Calculate mixture concentration from two solution volumes.

CHEM

Neutralization Calculator

Calculate neutralization volume using equivalents.

CHEM

Percent Solution Calculator

Calculate mass/volume percent solution.

CHEM

Serial Dilution Calculator

Calculate final concentration after repeated dilutions.

CHEM

Solution Dilution Calculator

Calculate final molarity after dilution.

CHEM

Actual Yield Calculator

Calculate actual yield from percent yield and theoretical yield.

CHEM

Chemical Equation Balancer

Balance hydrocarbon combustion from CxHyOz.

CHEM

Kp Calculator

Convert Kc to Kp for gas reactions.

CHEM

Net Ionic Equation Calculator

Estimate net ionic reacting equivalents after removing spectator amounts.

CHEM

Rate Constant Calculator

Calculate a rate constant from rate law data.

CHEM

Boiling Point Calculator

Estimate boiling point from vapor pressure using a simple Clausius-Clapeyron form.

CHEM

Gibbs' Phase Rule Calculator

Calculate degrees of freedom for a phase system.

CHEM

STP Calculator (Standard Temperature and Pressure)

Calculate gas volume at STP from moles.

CHEM

Vapor Pressure Calculator

Estimate vapor pressure with the Antoine equation.

CHEM

Vapor Pressure of Water Calculator

Estimate water vapor pressure from temperature.

CHEM

Diffusion Coefficient Calculator

Estimate diffusion coefficient from mean squared displacement.

CHEM

Langmuir Isotherm Calculator

Calculate surface coverage from Langmuir adsorption.

CHEM

Two-Photon Absorption Calculator

Estimate two-photon absorption rate from intensity.

CHEM

Young-Laplace Equation Calculator

Calculate pressure difference across a curved interface.

CHEM

Combustion Analysis Calculator

Estimate empirical mole ratios from CO2 and H2O masses.

CHEM

Combustion Reaction Calculator

Balance complete combustion for CxHyOz.

CHEM

Liquid Ethylene Density Calculator

Estimate liquid ethylene density from mass and volume.

CHEM

Calibration Curve Calculator

Calculate concentration from a linear calibration curve.

CHEM

Enzyme Activity Calculator

Calculate enzyme activity from product formed over time.

CHEM

Isoelectric Point Calculator

Estimate pI from acidic and basic pKa values.

CHEM

Michaelis-Menten Equation Calculator

Calculate enzyme reaction velocity.

CHEM

Protein Solubility Calculator

Estimate soluble protein mass from solubility and volume.

CHEM

Resuspension Calculator

Calculate buffer volume for a target stock concentration.

CHEM

Cubic Cell Calculator

Calculate cubic unit cell volume and density.

CHEM

Detention Time Calculator

Calculate tank detention time from volume and flow.

CHEM

Hydraulic Retention Time Calculator

Calculate hydraulic retention time.

CHEM

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.