How to Use Our Percentage Calculator
3 min read
How to Use Our Percentage Calculator
Percentages come up constantly -- sales tax, tips, discounts, test scores, investment returns. Our Percentage Calculator handles all common percentage calculations instantly.
Percentage Calculator
Enter up to 10,000%
Result
30
The Three Main Calculations
What is X% of Y?
Enter the percentage and the base number. For example: "What is 15% of 200?" Answer: 30. Use this for calculating tips, discounts, tax amounts, and commission.
X is what percent of Y?
Enter two numbers to find the percentage relationship. For example: "45 is what percent of 180?" Answer: 25%. Use this for calculating grades, completion rates, and proportions.
Percentage Change
Enter the original value and the new value to find the percentage increase or decrease. For example: from 80 to 100 is a 25% increase. Use this for tracking price changes, growth rates, and performance metrics.
Common Uses
- Shopping: A $120 item at 30% off = $120 - $36 = $84
- Tipping: 20% tip on a $65 bill = $13
- Grades: 42 out of 50 = 84%
- Investing: A stock goes from $50 to $62 = 24% return
Quick Mental Math Tip
To find 10% of any number, move the decimal point one place left. Then adjust from there: 20% is double the 10% amount, 5% is half of 10%, and 15% is 10% plus half of 10%.
Related Calculators
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Calculate discounted prices, savings amount, and discount percentage. Perfect for sales and pricing.
Tip Calculator
Quickly calculate the tip amount and split the bill among any number of people.