Free Percentage Calculator: Find Percent & Percentage Change

What is 15 percent of 80? How much is a 20 percent discount? What percentage did your marks come to? Percentages are everywhere, from shopping to salaries to exams. The PDFFlowState Percentage Calculator works out percentages and percentage change in your browser, for free, with no account.

Open the Percentage Calculator

What does the Percentage Calculator do?

Percentage Calculator calculates percentages and percentage change. Use it as a percentage finder to find a percentage, or to measure a percentage increase or decrease between two numbers.

How to calculate a percentage

  1. Open the tool. Go to Percentage Calculator. It works on phone and desktop.
  2. Choose the calculation. Pick what you want to find, such as a percentage of a number or a change between two values.
  3. Enter your numbers.
  4. Read the result.

No sign-up is needed, so it is a free percentage calculator online.

Percentage formulas

  • X percent of Y: (X ÷ 100) × Y
  • Part as a percentage of a whole: (part ÷ whole) × 100
  • Percentage change: ((new − old) ÷ old) × 100. A positive result is a percentage increase, a negative result is a decrease.

Worked examples

  • 15% of 80 = 0.15 × 80 = 12
  • 45 out of 60 = 45 ÷ 60 × 100 = 75%
  • Marks percentage: 432 out of 500 = 432 ÷ 500 × 100 = 86.4%
  • Percentage increase: from 50 to 65 = (65 − 50) ÷ 50 × 100 = +30%
  • Percentage decrease: from 80 to 60 = (60 − 80) ÷ 80 × 100 = −25%
  • Discount: 20% off a price of 50 = 50 − (0.20 × 50) = 40
  • Profit percentage: cost 200, selling price 250 = (50 ÷ 200) × 100 = 25%
  • Salary increase: from 3,000 to 3,300 = +10%

When is it useful?

  • Shopping and sales: work out discounts and the final price.
  • School and exams: turn marks into a percentage.
  • Work: calculate raises, growth and profit margins.
  • Money: understand interest, tax and tips.

Tips

  • Percentage change depends on the starting value. Going from 100 to 150 is +50%, but going back from 150 to 100 is −33.3%, not −50%.
  • Check what the base is. "20% more" and "20% of" are different calculations.
  • Related tools: Unit Converter and Age Calculator.

Frequently asked questions

Is the percentage calculator free? Yes. It is free and needs no sign-up.

How do I calculate the percentage of a number? Divide the percentage by 100 and multiply by the number. For example, 15% of 80 is 0.15 × 80 = 12.

How do I calculate percentage change? Subtract the old value from the new one, divide by the old value, and multiply by 100.

Can I use it for discounts and marks? Yes. Find the percentage of a price to see the discount, or divide your marks by the total and multiply by 100.

Is there a separate calculator for GPA, body fat or gestational age? Not at the moment. This tool handles percentages and percentage change.

Calculate your percentage now

Try the free Percentage Calculator or browse all the everyday converters on PDFFlowState.