Ratio Simplifier
Reduce any ratio to its simplest form, like 12:18 → 2:3.
Simplify ratios to their lowest terms in one step — enter 12:18 and get 2:3 instantly. Useful for recipes, scale models, screen aspect ratios, and mixing solutions. The decimal value of the ratio is shown alongside.
How it's calculated
Both sides are divided by their greatest common divisor (the Euclidean algorithm), so 12:18 becomes 2:3. The decimal value is simply the first number divided by the second.
Frequently asked questions
How do I simplify 12:18?
Type 12:18 — the calculator divides both sides by their greatest common divisor (6) and returns 2:3.
What formats can I type?
You can type 12:18, 12,18, or 12 18 — all are understood. Decimals work too, e.g. 2.5:5 simplifies to 1:2.
What is the decimal value for?
It shows the ratio as a single number (12:18 = 0.6667), which is handy when you need to compare ratios or use one in further calculations.