Percentage of a Number
X% × Y
Example: 20% of 500 = 100
🧮 Free Online Calculator
Percentage Calculator
Calculate percentages, percentage changes, increases and decreases quickly and accurately.
⚡ Instant Results
📱 Mobile Friendly
🔒 Private
💚 Free
1
What is X% of Y?
Find a percentage of a number.
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Result
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2
X is what percentage of Y?
Find what percentage one number is of another.
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Result
0%
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3
X is Y% of what number?
Find the original number when a percentage is known.
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%
Original Number
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4
Percentage Change
Calculate the percentage increase or decrease between two values.
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Percentage Change
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5
Percentage Increase or Decrease
Find the final value after increasing or decreasing a number by a percentage.
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Final Value
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Quick Reference
Percentage formulas
Simple formulas for common percentage calculations.
What Percentage?
(X ÷ Y) × 100
Example: 25 is 25% of 100
Percentage Change
((New − Old) ÷ Old) × 100
Positive means increase; negative means decrease.
Increase / Decrease
Original × (1 ± Percentage ÷ 100)
Add for increase and subtract for decrease.
How it works
Calculate percentages in seconds
Choose the calculation you need, enter your numbers, and get an instant result.
Choose a calculation
Select the percentage formula that matches what you want to calculate.
Enter your values
Enter the numbers into the clearly labelled input fields.
Calculate
Press the calculate button to instantly process your percentage.
Read your result
The answer and calculation explanation appear immediately below the calculator.
Why niDar Tools?
Simple, fast and private
Instant Calculation
Get percentage results immediately without unnecessary steps.
Mobile Friendly
Designed to work comfortably on phones, tablets and desktops.
Private
Calculations happen directly in your browser.
Completely Free
Use the percentage calculator without registration or payment.
Your calculations stay on your device
niDar Tools performs percentage calculations directly in your browser. No calculator data needs to be uploaded to a server.