📊 Percentage Calculator
Calculate percentages quickly and accurately. Choose from multiple calculation types below.
🔢 Calculate X% of Y
❓ What % is X of Y
📈 Percentage Change
➕ Add/Subtract %
🔄 Reverse Percentage
⚖️ Percentage Difference
💡 Common Percentage Problems
What is 20% of 150?
30
50 is what % of 200?
25%
Increase 100 by 25%
125
% change from 80 to 100?
+25%
Original if 120 is after 20% increase?
100
% difference between 40 and 60?
40%
📐 Percentage Formulas
X% of Y
Result = (X / 100) × Y
What % is X of Y
% = (X / Y) × 100
Percentage Change
% = ((New - Old) / Old) × 100
Add %
Result = N × (1 + P/100)
📋 How to Use the Percentage Calculator
- Choose the type of calculation, such as X% of Y or percentage change.
- Enter the numbers in the fields.
- Select Calculate.
🎯 When to Use It
- Working out discounts and sale prices.
- Calculating the percentage change between two figures.
- Adding or subtracting a percentage, such as tax or a markup.
💡 Tips & Common Pitfalls
- Percentage change is based on the original value, so a fall from 100 to 50 is 50 percent but a rise from 50 to 100 is 100 percent.
- Adding 20 percent and then subtracting 20 percent does not return to the original number.
- Check which number is which. X% of Y and what percentage X is of Y are different questions.
❓ Frequently Asked Questions
What is a percentage?
A percentage is a number expressed as a fraction of 100. The symbol % means "per hundred". For example, 25% means 25 out of 100.
How do I calculate percentage increase?
Percentage increase = ((New Value - Original Value) / Original Value) × 100. For example, if a price goes from $50 to $60, the increase is 20%.
What's the difference between percentage change and percentage difference?
Percentage change compares new to old value. Percentage difference compares two values to their average, useful when neither is a clear baseline.
Can percentages be negative?
Yes! A negative percentage indicates a decrease. For example, -15% means a 15% reduction.