Math & Education

Add or subtract a percentage from any number, or find what percentage one number is of another.

Convert percentages to decimals or fractions.

Add, subtract, multiply, or divide fractions.

Convert a fraction to its decimal equivalent.

Convert a decimal number to a simplified fraction.

Calculate the mean (average) of a set of numbers.

Find the median (middle value) of a set of numbers.

Calculate standard deviation for a set of numbers.

Calculate the square root of any number.

Calculate base raised to a power.

Calculate the remainder of a division.

Calculate the factorial of a number (n!).

Calculate GPA from letter grades and credit hours. Uses standard 4.0 scale. Free for students.

Calculate weighted average grade from assignments and their weights. Free online grade calculator.

Convert percentage grade to letter grade (A, B, C, D, F). Uses common US scale.

Generate book citations in APA, MLA, or Chicago format. Free citation generator for essays and papers.

Count words, characters, and paragraphs in your text. Includes reading time. Free online word counter.

Count characters with or without spaces. Check Twitter (280), meta descriptions (~155), and form limits. Free online character counter.

Count paragraphs in your text. Useful for essays, blog posts, and document structure. Free online paragraph counter.

Estimate how long it takes to read your text. Set WPM for X min read. Free for bloggers and writers.