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Free Percentage Calculator

Percentage Calculator

Three percentage tools in one page — percentage of a number, percentage change, and percentage difference. All results update in real time.

GST CalculatorDiscount Calculator
1

What is X% of Y?

0% of 0 =0.00

Formula: Result = (Percentage × Number) ÷ 100

2

Percentage Increase / Decrease

Percentage Increase+0.00%

Formula: Change % = ((New − Original) ÷ |Original|) × 100

3

Percentage Difference

Percentage Difference0.00%

Formula: |A − B| ÷ ((A + B) ÷ 2) × 100

Put Your Calculations to Work
Use our free GST Calculator to apply percentage tax to any amount, or create a GST-compliant invoice with automatic percentage calculations built in.
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Percentage Calculator – Easy Online Tool

Our free online percentage calculator helps you calculate percentages instantly — whether you need to find what percentage one number is of another, calculate a percentage increase or decrease, or find the percentage difference between two values. No formulas to remember. Just type and get your answer.

What is Percentage?

A percentage is a way of expressing a number as a fraction of 100. The word "percent" comes from the Latin per centum, meaning "by the hundred." Percentages are used everywhere — from calculating discounts and tax to tracking exam scores and profit margins. When you say "25%", it simply means 25 out of 100.

How to Calculate Percentage — Formulas Explained

1. Percentage of a Number

To find X% of Y, multiply the number by the percentage and divide by 100.

Result = (X × Y) ÷ 100

Example: 10% of 500 = (10 × 500) ÷ 100 = 50

2. Percentage Increase or Decrease

To find how much a value has increased or decreased in percentage terms.

Change % = ((New Value − Original Value) ÷ Original Value) × 100

Example: Price increased from ₹100 to ₹120. Change = ((120 − 100) ÷ 100) × 100 = +20%

3. Percentage Difference

To find the relative difference between two values, neither of which is the reference point.

Difference % = |A − B| ÷ ((A + B) ÷ 2) × 100

Example: Values 80 and 120. Difference = |80 − 120| ÷ ((80 + 120) ÷ 2) × 100 = 40 ÷ 100 × 100 = 40%

Where Are Percentages Used?

Discounts & Shopping

Calculate how much you save on a 30% off sale. Find the final price after discount.

Business & Profit

Calculate profit margin, markup percentage, and revenue growth for your business.

Exams & Results

Convert marks to percentage. Check your score percentage out of total marks.

Finance & GST

Calculate GST percentage, interest rates, and tax amounts on income or transactions.

Quick Percentage Examples

  • 10% of 500 = 50
  • 18% GST on ₹1,000 = ₹180
  • Increase from ₹100 to ₹125 = +25%
  • Decrease from ₹200 to ₹150 = −25%
  • Percentage difference between 40 and 60 = 40%
  • Exam: 450 out of 500 = 90%