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Converters, generators and study aids for students and teachers.
Popular Education tools
Weighted GPA Calculator
Calculate weighted and unweighted GPA with Honors and AP/IB bonus points.
Average (Mean/Median/Mode)
Compute mean, median, mode, range and more from a list of numbers.
Standard Deviation Calculator
Sample and population standard deviation, variance and mean.
Number to Words
Convert numbers into written English words, with support for decimals and negatives.
Multiplication Table
Generate a clean times table for any number and range.
Roman Numeral Converter
Convert numbers to Roman numerals and back, with full validation.
Prime Number Checker
Check whether a number is prime and see its factors and prime factorization.
Newest
Standard Deviation Calculator
Sample and population standard deviation, variance and mean.
Number to Words
Convert numbers into written English words, with support for decimals and negatives.
Roman Numeral Converter
Convert numbers to Roman numerals and back, with full validation.
Average (Mean/Median/Mode)
Compute mean, median, mode, range and more from a list of numbers.
Learn about Education
How to Write Numbers in Words: Rules and Examples
How numbers are spelled out in English: three-digit groups, scale words such as thousand and million, hyphens, and a worked example.
How Roman Numerals Work: Symbols, Rules and Examples
The seven Roman numeral symbols, the subtraction rule behind IV and IX, which forms are invalid, and a worked example.
How to Calculate Mean, Median and Mode (Worked Example)
How to work out the mean, median and mode by hand, with a worked example and guidance on which measure to report.
How to Tell if a Number Is Prime (with a Worked Example)
How primality testing by trial division works, a worked example with factors, and where prime numbers matter in practice.
How to Learn the Times Tables: Which Facts to Learn First
How a times table is built, a worked example, and an order for learning the multiplication facts that makes them quicker to remember.
How to Calculate Weighted GPA on the 4.0 Scale
The 4.0 grade point scale, how Honors and AP weighting changes the result, and a worked example.
Mean vs Median vs Mode: Which Average Should You Use?
They are all called "the average", but they answer different questions — and using the wrong one can badly mislead. Here is how to choose, with worked examples.
Education FAQ
Yes — every tool is free with no account required.
Most tools run entirely in your browser, so once the page loads they keep working without sending your data anywhere.