How to simplify a ratio, step by step
The greatest common divisor method, with examples for decimals, three-part ratios and mixed units.
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Ratio guides and how-tos
Short, plain-English guides to the ideas behind the calculators. Each one has worked examples you can follow on paper, and a link to the matching calculator when you want to check your answer.
How to convert a ratio to a percentage
Add the parts, divide each by the total, multiply by 100. Plus the reverse trip and a common trap.
3 min read →What is aspect ratio, and how do you calculate it?
Find the ratio from any width and height, then resize images and video without stretching.
3 min read →The golden ratio, explained simply
What 1.618 means, how Fibonacci numbers approach it, and a sensible view of the popular claims.
3 min read →Ratio vs fraction: what is the difference?
Part to part or part to whole? How to tell them apart and convert between the two.
3 min read →Prefer to just get an answer?
Open the calculatorsAll eight calculators are free and unlimited, and each one shows its working step by step.