Percentage Calculator
Solve any percentage problem in seconds. Whether you're calculating a tip, a discount, or a test score, get the precise answer instantly.
Math Made Simple
Percentages are everywhere—on sale tags at the mall, on your restaurant bill, in your tax returns, and on your report card. Yet, doing the mental gymnastics to figure out "what is 17% of 85" can be frustrating. Our Percentage Calculator is your digital cheat sheet, handling everything from simple fractions to complex percentage changes with zero errors.
Common Percentage Problems
There are three main ways percentages are used in daily life:
Percentage Of
Logic: Finding a part of a whole.
"What is 20% of $150?"
Use this for tips and commissions.
Percentage Change
Logic: Growth or Decline.
"My rent went from $1000 to $1100. How much did it go up?"
Use this for inflation and raises.
Reverse Percentage
Logic: Finding the whole.
"I paid $30 in tax, which is 10%. What was the total price?"
Use this for business accounting.
The Universal Formula
If you ever get stuck without a calculator, remember this simple formula:
You can rearrange this equation to solve for any missing variable. For example, if you know the Part and the Percentage, arithmetic gives you the Whole.
Shopping Sales
A $50 sweater is "30% off." How much do you save? Enter 30% of 50 to see that you save $15 and pay $35.
Restaurant Tips
The bill is $85.50 and you want to leave 18%. Use the calculate to find out exactly how much to write on the receipt ($15.39).
Freelance Taxes
You earned $2,000 and need to set aside 25% for taxes. A quick check tells you to put $500 into your savings account.
Frequently Asked Questions
What does "percent" mean?
The word comes from the Latin "per centum," meaning "by the hundred." So 50% literally means "50 out of every 100."
How do I verify a discount?
If a store claims "20% off," check the original price vs the final price. (Original - Final) / Original should equal 0.20.
Why is 50% + 50% not 100% in investing?
Percentages compound. If you lose 50% of $100, you have $50. If you then gain 50% of that $50, you only have $75. You need a 100% gain to recover from a 50% loss.
Accuracy
This calculator uses standard floating-point arithmetic. For extremely large numbers or specialized financial rounding, consult accounting software.
Data Privacy
We do not store your calculations. This tool runs entirely in your browser.