ScoutMyTool

Percentage Calculator

Calculate what X% of a value is, find what percentage one number is of another, or compute the percentage change between two numbers.

Inputs

Pick the question you want answered.

First number — its meaning depends on the mode chosen above.

Second number.

Result

25% of 200
50
  • Decimal form0.25
  • Calculation(25 ÷ 100) × 200

Step-by-step

  1. Convert the percentage to a decimal: 25% = 25 ÷ 100 = 0.25.
  2. Multiply by the value: 0.25 × 200 = 50.
  3. So 25% of 200 is 50.

How to use this calculator

  • Pick the calculation type that matches the question you are trying to answer.
  • Enter X and Y. The labels on the inputs update with the mode so you always know which number goes where.
  • Read the result instantly — no submit button. The step-by-step working below the result shows exactly how the answer was derived.

About this calculator

A percentage is just a fraction with a denominator of 100, so every percentage problem reduces to a single multiplication or division. This calculator handles the three forms you actually run into in real life: finding a percentage of a value (sales tax, tip, discount), expressing one number as a percentage of another (test scores, conversion rates), and measuring percentage change between two values (price increases, growth rates). Each mode shows the step-by-step working underneath the result so you can check the math by hand or use the explanation to teach.

Frequently asked

Convert the percentage to a decimal (divide by 100), then multiply by the number. For example, 25% of 200 is 0.25 × 200 = 50. Use the "What is X% of Y?" mode above for a worked example with any inputs you choose.