Ratio Calculator

  • Enter the values for A, B, C, and D in the input fields.
  • Click the "Calculate" button to perform the ratio calculations.
  • The simplified ratio will be displayed below along with whether the ratios are equivalent.
  • You can also see the calculation history below the results.
  • Click "Clear Results" to reset the inputs and results.
  • Click "Copy Results" to copy the result to the clipboard.
Calculation History


    The Ratio Calculator is a versatile mathematical tool that plays a crucial role in various fields such as finance, engineering, and science. This tool simplifies complex calculations involving ratios, providing a straightforward means of analyzing and comparing quantities.

    Understanding Ratios

    Ratios are a fundamental mathematical concept used to express the relationship between two or more quantities. A ratio is written in the form of “a:b” or “a to b,” where ‘a’ and ‘b’ are two numbers representing the quantities being compared. Ratios can be used to compare a wide range of attributes, such as distance, speed, concentration, and more.

    The Formulae Behind the Ratio Calculator

    The Ratio Calculator relies on several essential formulae to perform its calculations:

    1. Simple Ratio

    The simplest form of a ratio is expressed as ‘a:b,’ where ‘a’ and ‘b’ are integers. This ratio is used for direct comparisons, such as the ratio of boys to girls in a classroom or the ratio of red to blue balls in a bag.

    2. Compound Ratio

    A compound ratio involves multiple ratios combined together. If you have two ratios, ‘a:b’ and ‘c:d,’ the compound ratio is ‘a:b::c:d.’ Compound ratios are useful in scenarios where multiple comparisons need to be made simultaneously.

    3. Proportions

    Proportions are mathematical statements that two ratios are equal. The general proportion formula is ‘a:b = c:d.’ Solving proportions allows you to find an unknown value when other three values are known.

    4. Percentage

    Percentages are ratios expressed as a fraction of 100. The formula to convert a ratio into a percentage is: Percentage (%) = (a / b) * 100. This is used in finance and statistics to express values in a more intuitive way.

    5. Cross Multiplication

    Cross multiplication is a technique used to solve proportions. For a proportion ‘a:b = c:d,’ you can use cross multiplication to find the unknown value: ‘ad = bc.’

    Example Calculations

    Let’s illustrate the application of these formulae with some practical examples:

    Example 1: Simple Ratio

    Suppose you have a basket of fruits with 5 apples and 3 bananas. The ratio of apples to bananas is 5:3.

    Example 2: Compound Ratio

    In a chemistry experiment, you mix chemicals A and B in a 2:1 ratio and chemicals C and D in a 3:2 ratio. The compound ratio of A:B to C:D is 2:1::3:2.

    Example 3: Proportions

    If the ratio of the length to width of a rectangle is 3:2, and the width is 4 meters, you can use proportions to find the length: 3:2 = x:4, where x is the length. Solving the proportion, you find that x = 6 meters.

    Example 4: Percentage

    You have a test score of 36 out of 50. To express this as a percentage, use the formula: Percentage (%) = (36 / 50) * 100 = 72%.

    Example 5: Cross Multiplication

    To find the missing value in the proportion 4:6 = 8:x, you can cross-multiply: 4 * x = 6 * 8. Solving for ‘x,’ you get x = 12.

    Real-World Use Cases

    The Ratio Calculator is a powerful tool with numerous real-world applications:


    • Financial analysts use ratios to evaluate the performance of companies, such as the price-to-earnings ratio (P/E ratio) or the debt-to-equity ratio.
    • Investors use ratios to make informed decisions when buying or selling stocks.


    • Engineers use ratios to design and analyze mechanical systems, such as gear ratios in machines.
    • Structural engineers use ratios to determine the load-bearing capacity of materials.


    • Medical professionals use ratios to calculate drug dosages based on patient weight and age.
    • Researchers use ratios to analyze the effectiveness of treatments and interventions.


    • Teachers use ratios to assess student performance, such as the student-to-teacher ratio in a classroom.
    • Educational institutions use ratios to allocate resources efficiently.


    • Chefs and home cooks use ratios to scale recipes up or down based on the number of servings needed.
    • Bakers use ratios to maintain the balance of ingredients in recipes.


    The Ratio Calculator is an indispensable tool that simplifies complex mathematical operations involving ratios. With its diverse applications in finance, engineering, medicine, education, and everyday life, understanding and using ratios is essential. By leveraging the formulae and examples provided in this guide, individuals can harness the power of ratios to make informed decisions and solve practical problems.

    Last Updated : 23 February, 2024

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    22 thoughts on “Ratio Calculator”

    1. Well-presented and informative content. The article effectively communicates the importance of ratios and their diverse applications in different fields.

      1. Avatar of Benjamin Rogers
        Benjamin Rogers

        Indeed, the article offers valuable insights into the application of ratios in finance, engineering, medicine, education, and everyday life.

      2. The real-world use cases and explanatory examples enhance the understanding of ratios and their relevance across various disciplines. Very well-written article.

    2. The article brilliantly captures the importance of ratios in practical scenarios. The examples provided make it easier to comprehend and apply this mathematical concept.

      1. The clear explanations and diverse use cases of ratios make this article a valuable knowledge resource. Well-articulated and insightful content.

      2. Absolutely. The detailed breakdown of different ratio types and their relevance in fields like finance, engineering, and medicine is commendable.

    3. I found this article to be quite informative. The breakdown of different types of ratios and their applications is well-presented and easy to follow.

      1. Avatar of Kirsty Robinson
        Kirsty Robinson

        I couldn’t agree more. The examples provided help in grasping the practical implications of using ratios in different fields.

    4. The article provides a comprehensive understanding of ratio calculations and their real-world applications. A very informative and enlightening read.

      1. I couldn’t agree more. The article does a great job of demystifying the concept of ratios and showcasing their practical significance.

    5. I found the article to be informative and well-structured. The relevance of ratios in sectors like finance, engineering, medicine, and everyday life is clearly elucidated.

      1. I completely agree. The real-world use cases make the concept of ratios more relatable and applicable in various contexts.

      2. The applications of ratios in different industries and domains are effectively highlighted. The article offers a comprehensive understanding of their significance.

    6. The knowledge shared in this piece is invaluable. Understanding ratios and their real-world applications is integral to decision-making in many professions.

    7. This article provides a solid foundation for understanding the complexities of different ratios and their implications. The real-world use cases add significant value to the content.

      1. The examples and explanations are quite enlightening. The importance of ratios in diverse settings is well-captured in this article.

      2. Absolutely. The application of ratios in fields like finance, engineering, and medicine is elucidated in a compelling manner.

    8. The practical use cases highlighted make it clear that ratios have a significant impact on various industries and aspects of everyday life.

      1. Agreed. The examples effectively demonstrate the versatility of ratios and their relevance in different scenarios.

    9. I appreciate the comprehensive insights provided in this article. The relevance of ratios in financial, engineering, and medical contexts is well-articulated.

    10. This article is a great resource for understanding the importance and application of ratios. The real-world examples are particularly enlightening.

      1. I absolutely agree. The detailed explanation of the various formulae behind the Ratio Calculator is commendable.

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