Percentage Calculator Guide: How to Calculate Percentages for Everyday Life

Three Types of Percentage Calculations

Most percentage problems fall into three categories. Find what percent of Y is X (e.g., what percent of 200 is 50?). Find what is X% of Y (e.g., what is 15% of 80?). Find the percentage change (e.g., what is the percent increase from 50 to 75?). Our calculator handles all three instantly.

The basic formula is: percentage = (part / whole) × 100. But you can also work backward: part = (percentage × whole) / 100. Our calculator handles both directions and also calculates percentage increase and decrease between two numbers.

Common Uses

• Shopping discounts: A $80 jacket at 25% off saves you $20. You pay $60.
• Restaurant tips: 15% of a $65 bill is $9.75. 20% is $13.00.
• Sales tax: 8% tax on a $40 purchase adds $3.20 for a total of $43.20.
• Test scores: 42 correct out of 50 questions = 84%.
• Investment returns: A $10,000 investment growing to $12,500 is a 25% gain.
• Weight loss: Losing 15 lbs from 180 lbs is an 8.3% reduction.

Percentage Change: Increase vs Decrease

To calculate percentage change, subtract the original value from the new value, divide by the original value, and multiply by 100. A positive result is an increase; a negative result is a decrease. For example, a stock going from $50 to $60 is a 20% increase. Rent dropping from $1,500 to $1,350 is a 10% decrease.