Calculate pH, pOH, ion concentrations, and percent dissociation for strong and weak acids and bases

pH Calculator

Instant cube volume from edge or diagonal, with unit conversion.

Cube Volume Calculator

Instant DBE calculator for rings and π bonds in molecules

Degree of Unsaturation / Double Bond Equivalent Calculator

Calculate ΔG from ΔH, ΔS, T or K/Q with steps

Gibbs Free Energy (ΔG) Calculator

Convert Ka↔pKa and gauge acid strength instantly

pKa Calculator

Compute hardness from ions or EDTA—ppm, gpg, and dH

Water Hardness Calculator

Compute Eₐ or k₂ using the Arrhenius equation with steps

Activation Energy Calculator

Calculate k, activation energy, or k₂—clear steps and plot included

Arrhenius Equation Calculator

Find actual, percent, or theoretical yield with unit conversion

Actual Yield Calculator

Calculate entropy changes for gases, heating, and phase changes

Entropy Calculator

Compute protein or amino acid pI from pKa values with clear steps

Isoelectric Point (pI) Calculator

Calculate DNA concentration from A260 or convert ng/µL and nM

DNA Concentration Calculator

Calculate absorbance, concentration, path length, or molar absorptivity

Beer-Lambert Law Calculator

Calculate resuspension volume, concentration, or mass for reagents and oligos

Resuspension Calculator

Calculate protein concentration via A280, standard curves, and dilutions.

Protein Concentration Calculator

Calculate chemical equilibrium using ICE tables, Q vs K, and steps

Equilibrium ICE-Table Calculator

Calculate empirical formulas from mass or percent composition with steps

Empirical Formula Calculator

Estimate protein solubility and aggregation risk from pH, pI, salt, and temperature

Protein Solubility Calculator

Interactive pH titration curve visualizer with key points and steps

Titration Curve Visualizer

Generate lab-ready buffer recipes from target pH and volume.

Buffer Preparation Calculator

Find vapor pressure and composition for ideal solutions

Raoult’s Law Calculator

Determine R/S and E/Z stereochemistry using CIP priorities and inversion rules

R/S & E/Z Configuration Calculator

Calculate protein MW from FASTA or raw sequence, plus mass↔moles conversion

Protein Molecular Weight Calculator

Calculate enantiomeric excess from R/S %, chiral peak areas, or optical rotation

Enantiomeric Excess (ee) Calculator

Parse ¹H NMR peaks, simulate a spectrum, and get splitting + integration hints

¹H NMR Spectrum Helper

Calculate peptide net charge at any pH, estimate pI, and view charge contributions

Peptide Net Charge Calculator

Estimate BMR, TDEE, maintenance calories, and goal calorie targets with formulas and step-by-step explanations

BMR Calculator

Solve reaction problems faster - and actually understand the chemistry behind them.

Use free organic chemistry calculators to solve pKa, resonance, hybridization, and mechanism problems. Balance reactions, analyze acidity, and understand molecular behavior with ease.

Organic Chemistry Calculators & Converters | Free Online Reaction Tools

Struggling with mechanisms or reaction yields? Our organic chemistry calculators simplify pKa, resonance, hybridization, and more, turning tough reactions into clear, step by step logic.

Organic Chemistry Calculators & Converters

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Beginning & Intermediate Algebra

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Introduction to Python

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Introduction to Microsoft Power BI

Microsoft Power BI

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Data Analysis Fundamentals with Excel

Data Analysis - Excel

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Introduction to Blockchain

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Learn Enough HTML, CSS and Layout to be Dangerous

HTML, CSS & Layout

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Learn Enough JavaScript to be Dangerous: A Tutorial Introduction to Programming with JavaScript

Introduction to JavaScript

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