小数→分数変換器

概要

Expressing a decimal as a fraction is often clearer for recipes, measurements, and math work. This tool converts any decimal into its simplest fraction form instantly in your browser, handling both terminating and repeating decimals.

使い方（ステップ）

1. 1

   Enter the decimal

   Type the decimal number you want to convert.

2. 2

   Convert

   The tool writes it as a fraction and reduces it.

3. 3

   Read the simplest form

   The output is the fraction in lowest terms.

仕組み

The tool writes the decimal over a power of ten matching its decimal places (0.75 becomes 75/100), then reduces the fraction to lowest terms by dividing both parts by their greatest common divisor (giving 3/4). Repeating decimals use a different algebraic method to find the exact fraction. The result is the simplest equivalent fraction.

こんなときに使う

Converting a decimal measurement into a fraction for woodworking or cooking. Expressing a result as an exact fraction instead of a rounded decimal. Checking math homework.

よくある質問