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Free Percentage Calculator

Calculate percentages, percentage change, and more — instantly in your browser.

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Percentage Calculator

of
Formula: Result = (Percentage ÷ 100) × Number
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Result
of
Formula: Percentage = (Value ÷ Total) × 100
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Percentage
→
Formula: Change = ((New − Original) ÷ |Original|) × 100
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Percentage Change
is
% of what?
Formula: Original = Final Value ÷ (Percentage ÷ 100)
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Original Value

What is the Percentage Calculator?

The Percentage Calculator is a free tool that instantly solves all common percentage problems in one place. Choose from four calculation modes: find X% of a number, calculate what percentage one number is of another, compute the percentage increase or decrease between two values, or reverse-calculate the original value before a percentage was applied. All calculations run instantly in your browser.

How to Use the Percentage Calculator

  1. Select a calculation tab — choose the type of percentage problem you need to solve:
    • Basic % — What is X% of Y?
    • X% of Y — Find Y when X% of it equals Z
    • What % — What percentage is A of B?
    • % Change — What is the percentage increase or decrease from A to B?
  2. Enter your values — fill in the number fields for the selected calculation type.
  3. Click Calculate — the result and a plain-English explanation appear instantly.

Use Cases

Shopping Discounts

Calculate how much you save on a 20% off sale, or find the sale price from the original price and discount percentage.

Grade & Score Calculations

Find your test score percentage from marks obtained vs total marks, or calculate the grade needed to achieve a target average.

Finance & Tax

Calculate VAT amounts, GST, tip percentages, interest rate comparisons, and investment growth percentages.

Business & Analytics

Compute percentage changes in revenue, growth rates, profit margins, and market share comparisons.

Examples

Basic %: What is 15% of 200?
Enter: 15 | Of: 200
Result
15% of 200 = 30
% Change: From 80 to 100
Original value: 80 | New value: 100
Result
Percentage increase: +25%

Frequently Asked Questions

What four percentage modes are available?

Basic % (X% of Y), Percentage of (what is A as a % of B), Percentage Change (increase or decrease from A to B), and Reverse % (find original value when you know the final value after a % was applied).

How do I calculate a percentage increase?

Use the "% Change" tab. Enter your original value in the first field and the new value in the second. The calculator shows whether it's an increase or decrease and by what percentage.

How do I find the original price before a discount?

Use the "X% of Y" tab. If you know the sale price and the discount %, the reverse calculation finds the original price. Example: A product costs $85 after a 15% discount — original price was $100.

Is the Percentage Calculator free?

Yes, completely free with no account required. Calculate as many percentages as you need.

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