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

    What is Ratio?

    A ratio is a quantitative comparison between two or more quantities, expressed as a fraction, division, or a simple colon (“:”) between the numbers. Ratios are used to describe the relationship or proportion between the quantities being compared.

    All Formulae Related to Ratio

    1. Ratio Formula:
      • The ratio of two quantities a and b is represented as a:b or a/b.
    2. Proportional Formula:
      • Two ratios are said to be proportional if a/b = c/d, where a, b, c, and d are numbers.
    3. Part-to-Part Ratio Formula:
      • The part-to-part ratio between two quantities is a ratio that compares parts of a whole to each other.
      • Formula: Part-to-Part Ratio = (Part 1)/(Part 2)
    4. Part-to-Whole Ratio Formula:
      • The part-to-whole ratio compares a part to the whole from which it is taken.
      • Formula: Part-to-Whole Ratio = (Part)/(Whole)
    5. Equivalent Ratios Formula:
      • Ratios that represent the same proportional relationship between quantities are considered equivalent.
      • Formula: a:b = c:d if and only if (ad) = (bc)
    6. Simplification of Ratios:
      • To simplify a ratio to its simplest form, find the greatest common divisor (GCD) of the antecedent and consequent, and then divide both by the GCD.
      • Formula: Simplified Ratio = (Antecedent/GCD):(Consequent/GCD)
    7. Compound Ratios Formula:
      • Compound ratios involve comparing multiple quantities.
      • Formula: Compound Ratio = (a:b) : (c:d) : (e:f)
    8. Inverse Ratio Formula:
      • The inverse ratio of a:b is b:a.

    Practical Uses of Ratio

    Ratios have practical uses in a wide range of fields and everyday situations where relative proportions, comparisons, and relationships between quantities are important. Here are some practical uses of ratios:

    1. Cooking and Recipes:
      • Ratios are used to adjust ingredient quantities when scaling recipes to serve more or fewer people while maintaining the same flavor and consistency.
    2. Construction and Architecture:
      • Architects and builders use ratios to ensure accurate scaling of architectural drawings, blueprints, and construction plans.
    3. Finance and Investment:
      • Ratios are used to assess a company’s financial health and performance, such as debt-to-equity ratios and price-to-earnings ratios.
    4. Manufacturing and Production:
      • Ratios are applied in manufacturing processes to maintain consistent product quality and efficient resource allocation.
    5. Education and Mathematics:
      • Ratios are taught and used to solve mathematical problems involving proportions, fractions, and percentages.

    Applications of Ratio in Various Fields

    Ratios are used in various fields and industries to express and compare proportions, relationships, and relative quantities between different entities or values. Here are specific applications of ratios in various fields:

    1. Finance and Economics:
      • Financial Ratios: Assessing a company’s financial health and performance using ratios like debt-to-equity, price-to-earnings, and return on investment.
    2. Cooking and Culinary Arts:
      • Recipe Scaling: Adjusting ingredient quantities in recipes to serve different numbers of people while maintaining the same taste and consistency.
    3. Education and Mathematics:
      • Proportions: Teaching and solving problems involving proportions, percentages, and fractions in mathematics education.
    4. Construction and Architecture:
      • Scaling Drawings: Ensuring accurate scaling of architectural plans, blueprints, and model designs using ratios.
    5. Healthcare and Medicine:
      • Medication Dosages: Calculating and administering medication dosages based on the ratio of medication to patient weight.
    6. Manufacturing and Production:
      • Quality Control: Monitoring product quality and maintaining consistent quality standards using ratios and quality control metrics.
    7. Statistics and Data Analysis:
      • Percentages: Analyzing survey data and expressing relative frequencies as percentages or ratios.


    1. “The Language of Ratios” by David Tall (Educational Studies in Mathematics)
    2. “Ratios and Proportions in Physics” by Paul G. Hewitt (Conceptual Physics)
    3. “The Golden Ratio: Nature’s Perfect Proportion” by Mario Livio (Golden Ratio: The Story of Phi)

    Last Updated : 27 February, 2024

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