Find percent of a number
18% of 24043.2
Percentage Calculator
Answer percent-of questions, compare percentage change, add or subtract a percent, and recover an original value from a known part or final value.
Percent ofPercentage changeDiscounts and markupsReverse increase / decrease
Percent of a number
Find answers like 20% of 80.
20% of 8016
80 x 20 / 100
Steps
- Turn 20% into 0.2.
- Multiply 80 by 0.2.
- The answer is 16.
Examples
Recent answers
Recent percentage answers will appear here.
How to use the Percentage Calculator
- Choose the percentage question you want to answer.
- For Reverse percent, choose whether you know a part or a final value after an increase or decrease.
- Enter the part, whole, original value, new value, final value, or percentage requested by that setup.
- Press Calculate percentage to see the answer, formula, and steps.
- Check the divisor in a reverse answer before using examples, recent answers, or copy answer.
What people use it for
Find 18% of 240, 20% of 80, or another percent-of answer.
Check whether a value went up or down and by what percent.
Add or subtract a percent for discounts, markups, tax, tips, or growth.
Work backward when you know the part and percent but not the original whole.
Recover the original value before a known percentage increase or decrease.
Quick examples
Find what percent
25 is what % of 20012.5%
Find percentage change
160 to 11627.5% decrease
Add a markup
120 plus 25%150
Reverse the percent
30 is 15% of what?200
Before an increase
120 after a 20% increaseOriginal value = 100
Before a decrease
80 after a 20% decreaseOriginal value = 100
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Percentage CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- CalculatorsBrowse related calculators and utilities in the same category.
- Percentage And Ratio Calculator HubCompare this with the nearby tools and checks in the same job path.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Quick answers about percent-of, percentage change, discounts, original values, reverse increases or decreases, and privacy.
What can I use the Percentage Calculator for?
Use it when the question has a percent sign in it: percent of a number, what percent one number is of another, percent increase or decrease, discounts, markups, tips, tax, and reverse percentage problems.
What do the main Percentage Calculator inputs mean?
Pick the mode first: percent of, what percent, percent change, add/subtract percent, or reverse percent. Then enter the part, whole, original value, new value, or percent rate that matches that mode. A discount, tip, tax, markup, and reverse-percent question all use different boxes, so do not swap the part and the whole.
How do I find a percentage of a number?
Choose Percent of a number, enter the percentage and the value, then calculate. For example, 18% of 240 is 43.2 because 240 x 0.18 = 43.2.
How should I read the Percentage Calculator answer?
Read the headline answer, then check the supporting lines and examples to understand how the calculator got there. If one input changes, rerun the tool and compare the new answer instead of guessing.
What should I double-check before trusting the Percentage Calculator?
Check units, signs, rounding, and the selected mode before copying the answer. If the number feels weird, rerun one of the examples first, then put your own values back in slowly.
How is percentage change calculated?
Percentage change compares the difference with the original value: (new value - original value) / original value x 100. If 160 drops to 116, the change is -44, so the result is a 27.5% decrease.
Can this calculator handle discounts and markups?
Yes. Use Add or subtract percent. Choose Increase for markup, growth, tax, or tip calculations, and Decrease for discounts or reductions.
What is a reverse percentage?
A reverse percentage works backward to an original value. If 30 is 15% of a number, divide 30 by 0.15 to get 200. If 120 is the value after a 20% increase, divide 120 by 1.20 to recover the original 100.
How do I find the original value before a percentage decrease?
Choose Reverse percent, then After decrease. A final value of 80 after a 20% decrease represents 80% of the original, so divide 80 by 0.80 to get 100. The decrease must be less than 100%.
Why not subtract 20% from a final value after a 20% increase?
The 20% increase was calculated from the original value, not the larger final value. If 100 rises by 20% to 120, subtracting 20% of 120 gives 96. Dividing 120 by 1.20 correctly returns 100.
What mistake gives the wrong percent change?
Using the new value as the original value changes the answer. If a price moves from 160 to 116, 160 is the starting point. Reversing those numbers answers a different question.
When should I use a different calculator?
Use the Percent Off Calculator for a quick sale-price check, the Sales Tax Calculator for tax after a price, the Tip Calculator for restaurant bills, and the Percent Error Calculator for lab or measurement comparisons.
Is my percentage history private?
Yes. Recent percentage answers stay only in the current browser tab while you use the page. They are not sent to a server, and refreshing or closing the tab clears the short history.