Percentage Calculator

Use this free percentage calculator to answer percent-of questions, compare percentage change, add or subtract a percent, and work backward from a known percent.

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Smoke mascot comparing 18 percent of 240, 160 to 116 percent change, a 25 percent markup, and a reverse-percent card. — Percentage Calculator artwork matches the live modes: percent of a number, what percent, percent change, add or subtract percent, and reverse percent. View in the smoke-kawaii gallery

Percent of Percentage change Discounts and markups Reverse percent

Percent of a number

Find answers like 20% of 80.

PercentageOf value

20% of 8016

80 x 20 / 100

Steps

Turn 20% into 0.2.
Multiply 80 by 0.2.
The answer is 16.

How to use the Percentage Calculator

Choose the percentage question you want to answer.
Enter the values for percent-of, what-percent, percentage change, adjustment, or reverse percentage.
Press Calculate percentage to see the answer, formula, and steps.
Use examples, recent answers, or copy answer while you compare values.

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 the percent but not the original whole.

Quick examples

Find percent of a number

18% of 240

43.2

Find what percent

25 is what % of 200

12.5%

Find percentage change

160 to 116

27.5% decrease

Add a markup

120 plus 25%

150

Reverse the percent

30 is 15% of what?

200

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 Calculator See slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
Calculators Browse related calculators and utilities in the same category.
Percentage And Ratio Calculator Hub Compare this with the nearby tools and checks in the same job path.
Calculator and utility guides Find more guides that use real tool inputs and example numbers.
All free tools Search every live tool, converter, calculator, AI helper, and browser utility.

Frequently asked questions

Quick answers about percent-of, percentage change, discounts, reverse percentages, 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 from a known value and percentage. For example, if 30 is 15% of a number, the original whole is 200.

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.