EEasynivo
Free online tool

Ratio Calculator

Simplify a ratio or solve a proportion in the form A : B = C : X.

Enter your values

:

Result

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Enter the values and choose Calculate.

How to use this tool

Reduce ratios to their smallest whole-number form and find missing proportional values.

  1. Enter your values
  2. Calculate
  3. Copy · Share

Formula and method

A : B = C : X → X = B × C ÷ A

Worked example

1920 : 1080 simplifies to 16 : 9.

Frequently asked questions

Is this tool free and private?

Yes. It is free to use without an account, and the calculation runs in your browser.

Ratio Calculator

Simplify a ratio or solve a proportion in the form A : B = C : X.

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Percentage Calculator

Calculate percentages, percentage increases and decreases instantly. Free, private and easy to use with clear formulas and examples.

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Fraction Calculator

Add, subtract, multiply or divide two fractions and simplify the result.

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Average Calculator

Calculate the mean, sum, count, minimum and maximum of a list of numbers.

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Content basis and verification

· Calculations run in your browser. Check the formula and assumptions on this page, and confirm important financial, tax, medical or legal decisions against current official guidance.