Calculate your annual income from hourly, weekly, monthly, or yearly pay.

Annual Income Calculator

Calculate your test grade or required final score with steps

Test Grade Calculator

Find prime factors, all divisors, and step-by-step work for any integer

Prime Factorization Calculator

Calculate exact age in years, months, and days

Age Calculator

Calculate the duration between two dates in years, months, and days

Duration Calculator

Estimate your puppy’s adult weight and height from age, size, and breed

Dog Size Calculator (Puppy Size Predictor)

Calculate averages and weighted means from any set of numbers

Average Calculator

Estimate memory retention and plan optimal review timing

Forgetting Curve Calculator

Estimate take-home lottery winnings after federal, state, and local taxes

Lottery Tax Calculator

Calculate final price, savings, and discount percent for any deal.

Discount Calculator

Calculate Earth curvature drop, hidden height, horizon distance, and clearance

Earth Curvature Calculator

Calculate tip, total, and per-person split (with tax, rounding, and amount mode)

Tip Calculator

Calculate time between dates, add durations, or do HH:MM:SS math

Time Calculator

Calculate ROI, annualized return, payback period, project ROI, and compare investments

ROI Calculator

Calculate semester GPA, cumulative GPA, goal GPA, and retake impact with steps

GPA Calculator

Roll dice, simulate outcomes, and explore exact probabilities with step-by-step explanations

Dice Roller & Probability Simulator

Convert height, compare, find differences, and predict adult height with steps

Height Calculator

Estimate due date, pregnancy week, trimester, and milestones with LMP or ultrasound

Pregnancy Calculator

Calculate investment growth with compound interest, monthly contributions, goals, inflation, and scenarios

Investment Calculator

Estimate roof area, shingles, bundles, roofing squares, waste, and project cost

Roofing Calculator

Estimate rent affordability, roommate splits, move-in costs, and total housing expenses

Rent Calculator

Create personalized study schedules, exam countdowns, weekly planners, cram plans, and readiness scores

Study Schedule Calculator

Calculate required final exam scores, predict course grades, and compare what-if grade scenarios.

Final Grade Calculator

Track your current course grade, predict semester outcomes, and plan target grades

Semester Grade Calculator

Project your graduation GPA, plan future semesters, calculate required grades, and track academic milestones

College GPA Projection Calculator

Calculate SAT and ACT scores, compare test equivalents, predict improvements, and plan score goals

SAT / ACT Score Calculator & Predictor

Calculate cost per 1,000 impressions, or solve for cost or reach — with CTR, CPC, and platform benchmarks

CPM Calculator

Convert between number bases, or run binary arithmetic and bitwise operations - visualized bit by bit

Binary Calculator & Converter

Calculate loan payments, see the full amortization schedule, or solve for the max loan you can afford

Amortization Calculator

Find the true cost of a loan with fees, compare offers, and model credit card payoff time

APR Calculator

Versatile tools for academic, study, and everyday calculations across subjects.

Use free general calculators and converters for academic, study, and everyday problem solving. Get quick, reliable results with clear explanations you can trust.

General Calculators & Converters | Free Online Tools

Not every calculation belongs to a single subject. From academic planning tools to practical, everyday calculations, our general calculators and converters support common tasks students encounter across courses and daily life — delivering fast results with clarity and confidence.

General Calculators & Converters

Need help with chemical reactions, molecular structures, or exam prep? Get clear, step-by-step guidance to build confidence and succeed in chemistry.

General Chemistry

Jules

From mastering Newton’s laws to tackling thermodynamics, get step-by-step support on any challenging physics topic to stay prepared for assignments and exams.

Physics

Patrick

Struggling with evolution, ecosystems, or the human body? Master key biology concepts with clear explanations that make learning easier.

General Biology

Jason

Confused by balance sheets, income statements, or debits and credits? Get accounting concepts broken down step-by-step to build confidence for assignments and exams.

Financial Accounting

Brian

From memory and learning to personality and behavior, explore key psychology concepts and theories in a way that makes class discussions, labs, and tests easier.

Psychology

Hannah

Need help with supply and demand, market structures, or elasticity? Complex ideas in microeconomics become clear with guided explanations and examples.

Microeconomics

Struggling with the skeletal system, organ functions, or body processes? Connect the dots across anatomy and physiology to master the material with confidence.

Anatomy & Physiology

Bruce

Having trouble with equations, functions, or graphing? Algebra concepts are explained clearly to help solve problems faster and prepare for quizzes and exams.

College Algebra

Lost in reaction mechanisms, functional groups, or synthesis problems? Organic chemistry becomes manageable through step-by-step guidance and practice.

Organic Chemistry

Johnny

From Punnett squares to gene expression and DNA replication, genetics concepts are explained clearly to make problem solving more straightforward.

Genetics

Kylia

Balancing general, organic, and biochemistry in one course can be tough. Key concepts are connected across all three areas to help everything make sense together.

GOB Chemistry

New to chemistry? Atoms, elements, and reactions are broken down into simple steps to build a strong foundation for success in class and labs.

Introduction to Chemistry

Struggling with bacteria, viruses, or lab techniques? Microbiology concepts are simplified to keep studying efficient and exam prep on track.

Microbiology

From membranes and organelles to signaling pathways, cell biology is explained clearly to connect structure and function with ease.

Cell Biology

Need help with titrations, spectroscopy, or chromatography? Analytical chemistry concepts are simplified to support labs and problem sets.

Analytical Chemistry

Angles, identities, and trig functions giving you trouble? Trigonometry is explained step-by-step so solving problems feels more approachable.

Trigonometry

Callie

Need a solid foundation before calculus? Precalculus concepts like functions, sequences, and limits are clarified to prepare you for success.

Precalculus

Nick

From limits and derivatives to integrals and applications, calculus concepts are broken down to make homework and exams less stressful.

Calculus

Want to apply calculus to real-world business problems? Rates, optimization, and economic models are explained in simple terms for practical use.

Business Calculus

From probability to hypothesis testing, statistics concepts are explained step-by-step to build problem-solving skills and exam readiness.

Statistics

Struggling with data analysis, probability, or regression? Statistics is connected to real-world business decisions to make concepts easier to apply.

Statistics for Business

From proteins and enzymes to metabolism and pathways, biochemistry concepts are connected across chemistry and biology for deeper understanding.

Biochemistry

Need help with GDP, inflation, or monetary policy? Macroeconomics is simplified to highlight the big picture and boost exam performance.

Macroeconomics

Learn topics such as nutrition, physical activity, mental health, stress management and healthy lifestyle choices.

Personal Health

From macronutrients and vitamins to metabolism and diet planning, nutrition concepts are explained clearly and connected to real-life examples.

Nutrition

Learn how medical terms are built and what they mean by breaking them into simple parts. This course helps you understand and use the language of healthcare with confidence.

Medical Terminology

Explore how human societies are organized, how social relationships shape behavior, and how cultural, economic, and political forces influence everyday life.

Sociology

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

Beginning Algebra

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

Intermediate Algebra

Learn the toughest concepts covered in Beginning & Intermediate Algebra with step-by-step video tutorials and practice problems by world-class tutors

Beginning & Intermediate Algebra

Confused by cells, genetics, or how life works? Explore the building blocks of biology with simple, engaging explanations that turn complex science into concepts you'll actually understand.

Introduction to Biology

Curious about how your body works? Dive into human biology with clear, approachable lessons that break down anatomy, physiology, and everything that keeps you alive and thriving.

Human Biology

Physics with Algebra

Need a solid foundation before calculus? Algebra and Trigonometry concepts like functions and sequences are clarified to prepare you for success.

Algebra & Trigonometry

From logic and problem solving to voting systems, personal finance, and statistics, liberal arts math topics are explained step-by-step to build confidence with real-world mathematical thinking and strong preparation for quizzes and exams.

Liberal Arts Math

From logic and problem solving to ratios, finance, and statistics, quantitative reasoning concepts are explained step-by-step to build confidence applying mathematics to everyday situations, workplace contexts, and practical decision-making.

Quantitative Reasoning

Learn the type of accounting that focuses on providing financial information to internal stakeholders within an organization

Managerial Accounting

Tyler

Learn the guidelines that govern how financial transactions are recorded and reported

Principles of Accounting

From whole numbers and integers to equations and graphing, develop a strong understanding of foundational math concepts with clear, step-by-step support every step of the way.

Prealgebra

Master the fundamentals of algebra as you solve equations, analyze patterns, and work with mathematical relationships through guided, step-by-step instruction.

Prealgebra & Beginning Algebra

From foundational arithmetic through advanced algebraic concepts, develop the skills to solve increasingly complex mathematical problems with comprehensive, step-by-step support.