Simplify a ratio, or solve a proportion by leaving one value blank.
Simplify: fill A and B. Solve a proportion: fill three of the four boxes, leave one blank.
Enter the two values in A and B. The calculator divides both by their greatest common divisor to give the simplest whole-number ratio, plus the decimal (X : 1) form.
Write it as A:B = C:D and leave the unknown box blank. With three values filled, the tool solves the fourth using cross-multiplication.
Scaling recipes, mixing paint or fuel, aspect ratios, map scales and any situation where two quantities keep a fixed proportion.