Decimal to Fraction Calculator

  • Enter your decimal number in the "Enter a Decimal Number" field.
  • Click "Convert to Fraction" to convert the decimal to a fraction.
  • The simplified fraction will be displayed along with detailed calculations and explanations.
  • You can copy the fraction result to the clipboard by clicking "Copy Results".
  • Your calculation history will be displayed below.
  • To clear the results and start a new calculation, click "Clear Results".
Calculation History

    The Decimal to Fraction Calculator found on CalculatorUniverse is a specialized online tool designed to convert decimal numbers into their equivalent fractional forms. This process involves mathematical concepts such as multiplication by powers of 10, simplification, and the use of the greatest common divisor (GCD). In this comprehensive guide, we will delve into the theoretical background, practical applications, and the step-by-step workings of this calculator.

    Theoretical Background

    1. Decimals and Fractions

    • Decimals: A decimal number is a way of representing numbers in a system based on tens. It consists of a whole number part and a fractional part, separated by a decimal point.
    • Fractions: A fraction represents a part of a whole or, more generally, any number of equal parts. It is composed of a numerator (top part) and a denominator (bottom part).

    2. Conversion Process

    • The conversion of a decimal to a fraction involves transforming the decimal part into a fraction. This is done by placing the decimal part over a power of 10 (dependent on the number of decimal places) and then simplifying the resulting fraction.

    How the Calculator Works

    1. Input

    • User Input: The user enters a decimal number into the calculator.

    2. Conversion Mechanics

    • Multiplication by Power of 10: The calculator multiplies the decimal number by a power of 10, where the power (n) is equal to the number of decimal places. This step converts the decimal into a whole number.
    • Fraction Formation: The fraction is formed with the whole number as the numerator and the corresponding power of 10 as the denominator.

    3. Simplification

    • Greatest Common Divisor (GCD): To simplify the fraction, the calculator finds the GCD of the numerator and denominator.
    • Simplification Process: The numerator and denominator are then divided by their GCD, resulting in the simplest form of the fraction.

    4. Output

    • Result: The calculator displays the simplified fraction, providing a clear conversion of the original decimal number.

    Practical Applications

    Converting decimals to fractions is a fundamental skill in various fields:

    • Mathematics and Education: Understanding the relationship between different forms of numbers is crucial in math education.
    • Science and Engineering: Precise calculations require converting decimals to fractions for better accuracy or interpretability.
    • Finance: Financial calculations sometimes use fractions for interest rates, stock prices, or other financial ratios.

    Step-by-Step Example

    Let’s illustrate with an example. Suppose we want to convert the decimal 0.75 to a fraction.

    1. Decimal Number: 0.75
    2. Multiply by Power of 10: 0.75 * 100 = 75 (since there are two decimal places)
    3. Initial Fraction: 75/100
    4. GCD Calculation: GCD of 75 and 100 is 25.
    5. Simplified Fraction: Divide both numerator and denominator by 25: (75/25)/(100/25) = 3/4.

    Thus, 0.75 in decimal converts to 3/4 as a fraction.

    Facts and Additional Information

    • Historical Perspective: The concept of decimals was first introduced by Simon Stevin in the late 16th century, revolutionizing mathematical calculations.
    • Fractions in Different Cultures: Various civilizations developed fractions independently, with Egyptians using a distinct system as early as 1800 BC.
    • Decimal Places: The number of decimal places can affect the complexity of the fraction. More decimal places mean a larger denominator in the initial conversion.


    The Decimal to Fraction Calculator on CalculatorUniverse is a practical and efficient tool for converting decimals to fractions. Its operation hinges on fundamental mathematical principles and provides a user-friendly interface for a wide range of applications. Understanding the underlying concepts enhances its utility, making it an invaluable resource for students, professionals, and anyone interested in mathematics.


    1. Stevin, S. (1585). “De Thiende” (‘The Art of Tenths’).
    2. Boyer, C. B., & Merzbach, U. C. (1991). “A History of Mathematics”.
    3. Ifrah, G. (2000). “The Universal History of Numbers: From Prehistory to the Invention of the Computer”.

    Last Updated : 27 February, 2024

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