Work out canvas size ratio instantly with clear inputs, formula shown and shareable results.
The ratio is width over height, and the simplest fraction within a denominator of twenty is found by testing each denominator for the closest numerator. Standard canvas sizes cluster around a handful of ratios, so knowing that 60 by 80 is exactly 3:4 tells you what crop a photograph will need.
Aspect ratio
ratio = width / height
Diagonal
diagonal = sqrt(width^2 + height^2)
ratio = width / height. The ratio is width over height, and the simplest fraction within a denominator of twenty is found by testing each denominator for the closest numerator.
Standard canvas sizes cluster around a handful of ratios, so knowing that 60 by 80 is exactly 3:4 tells you what crop a photograph will need.
Enter canvas width, canvas height. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.