Percentage Calculator
Calculate percentages easily
Percentage Calculator
Result
About Percentage Calculator
The Percentage Calculator helps you solve everyday percentage problems instantly. Whether you're calculating discounts, tips, tax, grade scores, or percentage increase/decrease, our calculator provides accurate results in seconds.
Free online percentage calculator for all your needs: find percentages, calculate percentage increase/decrease, determine discounts, and solve everyday math problems instantly.
How to Use This Percentage Calculator
Step 1: Select the calculation type — % of Number, is what %, % Increase, or % Decrease.
Step 2: Enter the first number (percentage, original value, or first number).
Step 3: Enter the second number (number, second number, or new value).
Step 4: Click "Calculate" to see the result instantly.
Step 5: Use the Reset button to clear all inputs and start a new calculation.
Why Use a Percentage Calculator?
✓ Quick Shopping Discounts
Calculate sale prices instantly. Save time and money by knowing exactly what you'll pay after discount.
✓ Grade/Scores Calculation
Calculate exam percentages, test scores, and overall academic performance accurately.
✓ Business & Finance
Calculate profit margins, sales growth, tax percentages, and commission rates.
✓ Everyday Math
Calculate tips at restaurants, tax on purchases, and percentage changes in daily life.
Percentage Formulas
Percentage of Number
Result = (Percentage ÷ 100) × Number
Example: 20% of 500 = (20÷100) × 500 = 100
Percentage Increase
% Increase = ((New - Original) ÷ Original) × 100
Example: 50 to 70 = ((70-50)÷50)×100 = 40%
Percentage Decrease
% Decrease = ((Original - New) ÷ Original) × 100
Example: 80 to 60 = ((80-60)÷80)×100 = 25%
Percentage of a Number
% = (Part ÷ Whole) × 100
Example: 30 is what % of 200? = (30÷200)×100 = 15%
Real-World Applications
Percentage Calculation Tips
- 💡Mental math shortcut: 10% of any number = move decimal one place left. 20% = double that. 50% = half.
- 💡Reverse percentage: To find original price after discount, divide sale price by (1 - discount%). Example: $800 at 20% off = 800 ÷ 0.8 = $1000.
- 💡Percentage difference: For comparing two values, use percentage change (increase/decrease). Not percentage points (1 percentage point = 1%).
About Percentage Calculator
Free online percentage calculator for all your needs: find percentages, calculate percentage increase/decrease, determine discounts, and solve everyday math problems instantly.
Frequently Asked Questions
Built and maintained by Sanjay Singh · Founder, Numrexo
Builds and maintains the calculators on Numrexo. Each tool's formula is documented on its page, and any reference source it relies on is listed under Method and references.
Last updated: · Calculations run in your browser. Nothing you enter is sent to us or stored.
Method and references
- Formulas shown on the page for each of the three calculation types
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