Percentage Calculator
The Percentage Calculator helps you quickly calculate percentages, find out what percent one number is of another, and determine percentage increases or decreases. Percentages are everywhere, from exam scores and shopping discounts to taxes, interest rates, and business profits. With this free online tool, you can solve percentage problems instantly and error-free.
Percentage Calculator
Calculate percentages, percentage change, and percentage of a number
What is a Percentage?
A percentage is a way of expressing a number as a fraction of 100, represented by the symbol %
- 25% means 25 out of 100 (one-quarter of the whole).
- 50% means 50 out of 100 (half of the total).
How to Use the Percentage Calculator
This free tool has three main functions:
Find X% of Y
Example: What is 30% of 200?
- Enter 30 in the first box, 200 in the second box.
- Result: 60
What Percent is X of Y?
Example: What percent is 20 of 100?
- Enter 20 as the part and 100 as the whole.
- Result: 20%
Percentage Change (Increase/Decrease)
Example: Price increases from 100 to 140.
- Enter 100 (original value) and 140 (new value).
- Result: 40% increase
Formulas Behind the Calculator
Percentage of a Number
Result=(Percentage÷100)×NumberResult = (Percentage ÷ 100) ×
NumberResult=(Percentage÷100)×Number
What Percent One Number is of Another
Result=(Part÷Whole)×100Result = (Part ÷ Whole) × 100Result=(Part÷Whole)×100
Percentage Change
Change(Change (%) = ((New – Original) ÷ Original) × 100Change(
- Positive = Increase
- Negative = Decrease
Why Use This Percentage Calculator?
Fast & Free
No sign-ups, no fees, just instant results.
Eliminates Errors
Accurate results every time, no manual mistakes.
Multiple Uses
Discounts, taxes, profits, scores, rent changes, and more.
Learning-Friendly
Shows step-by-step solutions for better understanding.
Works on Any Device
Mobile, tablet, or desktop.
Real-Life Applications
- Shopping Discounts: 20% off $100 = Save $20
- Finance: Profit grew from $5000 to $6200 = 24% increase
- Education: Scored 42 out of 50 = 84%
- Daily Life: Rent increased from $900 to $980 = 10% increase
Tips for Best Results
- Enter only numbers (no % signs).
- Place values in the correct boxes (original vs. new).
- Use decimals if needed (e.g., 12.5%).
FAQs
What is a percentage?
A percentage expresses a number as a fraction of 100, written with the symbol %. For example, 25% means 25 out of 100.
How do you calculate a percentage manually?
Divide the part by the whole and multiply by 100. Example: 20 out of 50 = (20 ÷ 50) × 100 = 40%.
Can I use this calculator for percentage increase and decrease?
Yes! Enter the original and new values, and the calculator will instantly show the increase or decrease in percentage.
Is this tool free to use?
Yes. The AllCalculator Percentage Calculator is 100% free, with no hidden charges or sign-ups.
Who can use this percentage calculator?
Students, teachers, professionals, shoppers, and anyone who needs quick, accurate percentage calculations.
Does it work on mobile phones?
Yes. AllCalculator is mobile-friendly and works smoothly on phones, tablets, and desktops.