The Ratio Calculator simplifies, scales, and compares proportions between numbers. It helps you find missing values in a ratio pair or scale a ratio up or down. This is extremely useful for scaling recipes, mixing fuel, resizing images, or calculating scale models in design projects.
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Enter Initial Ratio: Type in your starting ratio values (A : B).
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Enter Target Value: Input one value of your new scaled ratio (either C or D) to find the missing variable.
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Submit: Click calculate to find the missing proportion and see the simplified ratio.
- The Concept: A ratio compares the sizes of two or more values. Scaling a ratio keeps the relative proportions of the parts exactly the same even if the total amount increases or decreases.
- The Formula: A / B = C / D
- To solve for a missing value (e.g. D): D = (B * C) / A
Suppose you are mixing concrete where the required ratio of cement to sand is 1 : 3. You have 5 bags of cement and need to know how much sand to mix.
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Enter the starting ratio: A = 1, B = 3.
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Input the cement value you have: C = 5.
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Solve for the missing sand amount (D): D = (3 * 5) / 1 = 15.
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You need to mix exactly 15 bags of sand with your 5 bags of cement to keep the correct ratio!
