Ratio Calculator
Simplify, scale, and solve proportional ratios for cooking, construction, mixing, and everyday calculations. The simplest ratio tool available.
Ratios and Proportions
Simplifying Ratios
Divide both values by their Greatest Common Divisor (GCD). 12:8 → GCD is 4 → 3:2. 100:75 → GCD is 25 → 4:3. A simplified ratio shows the same relationship with the smallest whole numbers.
Scaling Proportions
If paint is mixed at 2 parts blue to 3 parts white and you want 10 litres of blue, you need: 3/2 × 10 = 15 litres of white. The ratio stays the same; the quantities scale proportionally.
Common Uses
Cooking: scaling ingredients to a different number of servings. Cement mixing: 1 cement to 4 sand to 8 aggregate. Map scales: 1:25,000 means 1cm on map = 250m in reality. Scale models: 1:72 scale means the model is 72 times smaller than the original.
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