Simplify any ratio to lowest terms — instantly.
Enter Ratio
Simplified Ratio
Scale Ratio
Set one term to a specific value and the other term(s) will be scaled proportionally.
Multiplier: ×0.5
How it works
A ratio simplifier reduces any ratio — like 12:8 or 15:10:25 — to its lowest terms by dividing all parts by their Greatest Common Divisor. Use this free tool to simplify two-term or three-term ratios instantly, including those with decimals. You can also scale a simplified ratio so that one term equals any target value, making it easy to apply proportions in recipes, maps, or design work.
Find the Greatest Common Divisor (GCD) of all terms, then divide each term by the GCD. For example, 12:8 has a GCD of 4, so it simplifies to 3:2.
Yes. The tool first scales all decimal values to integers (e.g. 1.5:2.5 becomes 15:25), then divides by the GCD to get 3:5.
Scaling sets one term to a specific value and adjusts the other terms by the same multiplier, preserving the proportion. For example, scaling 2:3 so the first term is 10 gives 10:15.
Yes. Enable the third-term input and enter all three values. The GCD is computed across all three terms simultaneously to reduce the ratio to its simplest form.