Percentage Calculator
? Frequently Asked Questions
What percentage calculations can I perform?
The calculator handles: what is X% of Y, X is what % of Y, percentage increase/decrease, percentage difference between two numbers, and finding the original value before a percentage change.
How do I calculate percentage increase?
Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, going from 50 to 75 is a 50% increase because (75-50)/50 = 0.5 = 50%.
What's the difference between percentage increase and percentage points?
Percentage increase is relative (50% to 60% is a 20% increase), while percentage points are absolute (50% to 60% is a 10 percentage point increase). They're different measurements.
Can it calculate discounts and tips?
Yes! For a 20% discount on $100, calculate 20% of 100 ($20) and subtract. For a 15% tip, calculate 15% of your bill. The tool handles all these common percentage scenarios.
How do I find the original price before tax?
To find the pre-tax price, divide the final price by (1 + tax rate). For example, if something costs $120 with 20% tax, the original was $120 ÷ 1.20 = $100.
Is my data safe and secure?
Yes, absolutely! This tool runs entirely in your browser. All data processing happens locally on your device - nothing is uploaded to our servers. Your files and data never leave your computer, ensuring complete privacy and security.