keisoku

Ratio Calculator (Percentage & Composition)

Calculate the percentage (%) from a part and a whole, work backward to find a part from a percentage, or break down multiple items into a composition ratio shown in a table.

Input

Calculation type

Example: for a test scored "24 correct out of 30", enter part = 24 and whole = 30 to get the score rate.

Result

Percentage

25%

Part value

30

Whole value

120

Percentage

25 %

How it works

  • "Find percentage (%)" divides the part value by the whole value and multiplies by 100. It works directly for test score rates and completion rates.
  • "Find the part" multiplies the whole value by a percentage (%). For example, you can quickly check the amount or count that equals 15% of the whole.
  • "Composition ratio" lets you enter several items and shows each item's share (%) of the total in a table, highlighting the largest item in color.
  • Add items with the "Add item" button and remove unneeded rows with the ✕ button. This view is ideal for comparing breakdowns such as population by region or sales mix.
  • The composition ratio divides each item against a total treated as 100%, so rounding may cause the sum to differ slightly from 100.0%.
  • Decimal values are accepted and results are shown to about two decimal places. A percentage cannot be calculated when the whole value is 0.