Study Tools

Free tools for school and studying citations, typing tests, a scientific calculator, GPA calculator, and more.

Percentage Calculator

Find percentages, shares, and percent change.

GPA Calculator

Calculate your weighted GPA on a 4.0 scale.

Citation Generator

Create APA, MLA, or Chicago style citations in seconds.

Unit Circle Calculator

Find sin, cos, and tan for any angle with an interactive chart.

Scientific Calculator

Trig, logarithms, powers, and roots, free online.

Flashcard Maker

Create your own flashcards, then study them right in your browser.

Fraction Calculator

Add, subtract, multiply, or divide fractions and get the simplified answer.

Choosing and using study tools

Study tools are most useful when they make the underlying work easier to understand rather than replacing it. Use them to check calculations, organize practice, format a draft citation, or review a concept. Each page provides instructions and context for interpreting the output.

Tips for reliable results

Compare citation details with your instructors required edition and confirm unusual sources manually. For math tools, try a worked example and estimate the answer before accepting the result. Keeping your own notes about the method will help you recognize errors and apply the same idea when a calculator is not available.

Choose a tool above to see its inputs, method, privacy notes, examples, limitations, and answers to common questions. Related tools are linked on every page so you can continue a task without returning to search.