Ratio Calculator
Solve ratio problems instantly. Find missing values in proportions or simplify ratios to their lowest terms.
Solve Proportion (A : B = C : D)
Leave one box empty to find its value.
Simplify Ratio
Simplified Result
-- : --Tip: In a proportion, the product of the means (B×C) equals the product of the extremes (A×D).
The Golden Rule of Proportions
A proportion is a statement that two ratios are equal. Solving proportions is a skill used in everything from resizing images and mixing paints to calculating recipe ingredients.
How to Solve for X
When you have three known values in the form A/B = C/D, you can always find the fourth. If you are looking for D, the formula is D = (B × C) / A. This is often called cross-multiplication.
Simplifying Ratios
Simplifying a ratio means reducing the numbers to their smallest integer form while maintaining the same relationship. For example, a ratio of 10:20 simplifies to 1:2. This is done by finding the Greatest Common Divisor (GCD) and dividing both parts by it.