Percentage Calculator - Calculate Percentages Online Free

Calculate percentages easily with our free online percentage calculator.

Inputs

Percentage Calculator

What is Percentage?

Calculate percentages easily. Find percentage of a number, calculate percentage increase/decrease, or convert fractions to percentages instantly.

Common Use Cases

  • Calculate discounts in stores
  • Calculate taxes and tips
  • Analyze financial and statistical changes

Results

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How the Percentage Calculator Works

Percentage = (Part / Whole) x 100 | X% of Y = (X x Y) / 100

A percentage is a way of expressing a number as a fraction of 100. The symbol % means 'per hundred'. Percentages are used daily for calculating discounts, taxes, interest rates, and statistical data.

  1. 1

    Select Calculation Type

    Choose the type of percentage calculation you need from the dropdown menu

  2. 2

    Enter Values

    Input the known values in the appropriate fields

  3. 3

    Get Results

    The calculator automatically computes the result

  4. 4

    Review Formula

    Check the calculation details to understand the formula used

Use Cases

Shopping Discounts

Calculate final prices after percentage discounts on products

Tax Calculations

Compute sales tax, VAT, or income tax amounts

Grade Conversions

Convert test scores to percentages for academic evaluation

Investment Returns

Calculate return on investment and portfolio performance

Tips

  • 1

    To find X% of Y, multiply Y by X and divide by 100

  • 2

    To find what percentage X is of Y, divide X by Y and multiply by 100

  • 3

    Percentage increase = ((New - Old) / Old) x 100

  • 4

    For reverse percentage, divide the part by the percentage and multiply by 100

Common Mistakes

  • Confusing percentage points with percentages - an increase from 10% to 15% is 5 percentage points but a 50% relative increase

  • Calculating discount from the discounted price instead of the original price

  • Adding percentages directly - two successive 10% increases equal 21%, not 20%

  • Forgetting that a 50% decrease requires a 100% increase to return to the original value

Frequently Asked Questions

How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 25% of 200 = (200 x 25) / 100 = 50.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 is what percent of 120? (30 / 120) x 100 = 25%.
How do I calculate percentage change?
Use the formula: ((New Value - Old Value) / Old Value) x 100. A change from 80 to 100 is ((100-80)/80) x 100 = 25% increase.
How do I convert a fraction to a percentage?
Divide the numerator by the denominator and multiply by 100. For example, 3/4 = 0.75 x 100 = 75%.
What is the difference between percentage and percentage points?
If a rate increases from 10% to 15%, it increased by 5 percentage points, but the relative increase is 50% (because 5/10 = 0.5 = 50%).

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