Percentage Calculator
Three powerful percentage calculators: find a percentage of a number, calculate what percent one number is of another, and compute percentage change.
What is X% of a number?
X is what % of Y?
Percentage Increase / Decrease
How to use the Percentage Calculator
- 1
Pick a calculator — choose from the three percentage calculators above.
- 2
Enter your numbers — fill in the input fields.
- 3
Read the result — the answer appears instantly below the inputs.
Percentage Calculator – Free Online Tool
Calculate percentages, percentage change, and what percent of a number.
What is the Percentage Calculator?
Our free Percentage Calculator is a versatile math tool designed to solve common percentage problems instantly. Whether you need to find out what 15% of $85 is, determine the percentage increase in your rent, or figure out what percent a test score represents, this tool handles the complex cross-multiplication for you.
Who benefits from an online percent calculator?
Retail shoppers figuring out sale discounts, business owners calculating profit margins or sales tax, stock traders calculating portfolio percentage growth, and students checking their math homework rely heavily on this tool to prevent costly arithmetic errors.
Why is calculating percentage change confusing?
Figuring out percentage increase or decrease manually confuses many people because the formula ((New - Old) / Old) x 100 isn't intuitive to remember in daily life. Our tool provides a dedicated 'Percentage Change' module, giving you the exact percentage jump or drop instantly without worrying about the underlying formula.
Frequently Asked Questions
Everything you need to know about the Percentage Calculator.
How do you calculate a percentage increase?
To calculate percentage increase manually: Subtract the original number from the new number, divide that difference by the original number, and then multiply by 100. Or, just plug the 'Old' and 'New' values into our tool for an exact instant read-out.
Can I use this for calculating store discounts or sales tax?
Yes! If a jacket is $120 and has a 20% discount, enter 'What is 20% of 120' to find the discount amount ($24). Subtract that, and you know the final price. The tool handles fractional and decimal percentages perfectly.
What does '% of' actually mean in math?
Percentage basically means 'per 100'. So, asking for 15% of 200 is asking 'If I take 15 units out of every 100 units, how many do I have total?' The calculator converts the percentage to a decimal (0.15) and multiplies it against your number.