Calculate pH, pOH, or ratios for acids and bases

pH Calculator

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

Cube Volume 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

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

General Chemistry

Jules

Study the key concepts of Physics with descriptive videos, questions, and more

Physics

Patrick

General Biology

Jason

Financial Accounting

Brian

Dive deep into Psychology with videos, practice problems, and more.

Psychology

Microeconomics

The first in a two-course sequence introduces the basic structure and functions of the human body

Anatomy & Physiology

Bruce

College Algebra covers algebraic topics and skills necessary to succeed in college-level math

College Algebra

Organic Chemistry

Johnny

Genetics

Kylia

GOB Chemistry

Dive deep into General, Organic, and Biological Chemistry with videos, practice problems, and more.

Intro to Chemistry

Microbiology

Cell Biology

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Study topics incliding trogonometric functions, identities and equations, solutions of triangles, complex numbers, and other topics as time permits

Trigonometry

Callie

Learn the toughest concepts covered in Precalculus with step-by-step video tutorials and practice problems by world-class tutors

Precalculus

Nick

Learn the toughest concepts covered in Calculus with step-by-step video tutorials and practice problems by world-class tutors

Calculus

Learn the toughest concepts covered in Business Calculus with step-by-step video tutorials and practice problems by world-class tutors

Business Calculus

Learn the toughest concepts covered in Business Statistics with step-by-step video tutorials and practice problems by world-class tutors

Business Statistics

Learn the toughest concepts covered in Statistics with step-by-step video tutorials and practice problems by world-class tutors

Statistics

Biochemistry

Macroeconomics

Dive deep into Personal Health with videos, practice problems, and more.

Personal Health

Dive deep into Nutrition with videos, practice problems, and more.

Nutrition

My Courses

College Courses

Professional Courses

Chemistry

Biology

Math

Social Sciences

Health Sciences

Business

Dive deep into Python with videos and more.

Introduction to Python

Arianne Dee

Agile Project and Product Management

Agile & Product Management

Mariya Breyther

Introduction to Microsoft Power BI

Microsoft Power BI

Chris Sorensen

Data Analysis Fundamentals with Excel

Data Analysis - Excel

Chris Sorensen & Ammul Shergill

Getting Started with  and Cryptocurrency

Introduction to Blockchain

George Levy

Learn Enough HTML, CSS and Layout to be Dangerous

HTML, CSS & Layout

Lee Donahoe & Michael Hartl

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

Introduction to JavaScript

Michael Hartl

R Programming

Jared P. Lander

Digital Marketing Analytics Beyond Advertising

Digital Marketing

Mike Moran

Project Management

Jeffrey K. Pinto

AI in Marketing

Product & Marketing

Programming

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