Ratio Calculator
Simplify ratios and solve missing values in a proportion.
Ratio Calculator
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—Result
Formula & How It Works
A : B = C : D, so D = B × C ÷ ARatios compare quantities. Dividing both sides by their greatest common divisor creates the simplest form.
Use this calculator as a fast planning tool. Always confirm important financial, medical, construction, or recipe measurements with a qualified source before making final decisions.