How this calculator works
Values are scaled to integers at six-decimal precision and divided by their greatest common divisor. Equivalent mode keeps B/A constant when the new A is supplied. A ratio of 0:0 is undefined; a ratio with just one zero can be simplified, but scaling from A=0 is undefined.
The formula
Simplified ratio = A/g : B/g after equal decimal scaling
Equivalent B = New A × B / A.A quick example
20:30 simplifies to 2:3. For 2:3 = 10:x, x = 10 × 3 / 2 = 15.
How to use this calculator
- Choose simplification or equivalent-ratio mode.
- Enter A and B; equivalent mode also needs the new A.
- Calculate the simplest integer ratio and any missing equivalent value.
A few common questions
Can I enter decimals?
Yes, up to six decimal places, with each original value no larger than one million.
Can one side be zero?
Yes, for simplification. Both sides cannot be zero and equivalent mode requires a nonzero A.
Can I resize an image here?
A ratio helps, but the Aspect Ratio Calculator provides labeled width and height controls.