Percentage calculator
Choose the type of calculation, enter two numbers and get the result instantly.
How to calculate a percentage
To find X% of Y, multiply Y by X and divide by 100. Example: 20% of 150 = 150 × 20 ÷ 100 = 30.
What percentage is a value?
To find what percentage A is of B, divide A by B then multiply by 100. Example: 30 out of 150 is 30 ÷ 150 × 100 = 20%.
Calculating a percent change
The change between an old value and a new one is (new − old) ÷ old × 100. A rise from 100 to 120 is +20%. A drop from 120 to 100 is −16.67%.
Everyday uses
Sales and discounts, rent or salary increases, profit margins, tips, revenue growth.
Frequently asked questions
How do I calculate 20% of 150?
150 × 20 ÷ 100 = 30.
How do I calculate a percent change?
(new value − old value) ÷ old value × 100.
How do I calculate a 30% discount?
Multiply the price by 0.7 to get the price after the discount.
How do I add a percentage to a number?
Multiply by 1 plus the rate: for +15%, multiply by 1.15.
More free tools
Combine several PDFs into a single file.
Compress a PDFShrink a PDF so you can email it.
Convert images to PDFTurn your photos and scans into a PDF.
Convert a PDF to JPG imagesConvert each page of a PDF into an image.
QR code generatorFree QR code as PNG or SVG.
Compress imagesMake your JPG, PNG and WebP photos lighter.
Password generatorStrong, random password.
Word and character counterWords, characters, social media limits.
Compress videoMake a video lighter without visible loss.
Convert video to GIFTurn a video into an animated GIF.
Trim videoKeep only the right part.
Extract MP3 from a videoGet the sound of a video as MP3.
BMI calculatorFind your BMI and its WHO category.
Uppercase and lowercase converterSwitch text case in one click.
Age calculatorYour exact age and next birthday.
Calorie calculatorYour daily calorie needs to lose, maintain or gain weight.
Ideal weight calculatorYour ideal weight and normal weight range.
Water intake calculatorHow much water to drink each day.
Sleep calculatorThe best bedtime or wake-up time.
Grade average calculatorWeighted average and the grade you need next.
Unit converterLength, weight, volume, temperature and more.
Days between two datesDays between dates and date arithmetic.
Extract pages from a PDFKeep only the pages you need.
Rotate a PDFRotate all pages or just a few.
Add page numbers to a PDFNumber the pages of your PDF.
Add a watermark to a PDFPut a watermark on every page.
Delete pages from a PDFRemove the pages you don’t need.
Crop a PDFTrim the margins of your PDF.
Protect a PDF with a passwordLock your PDF with a password.
Remove a PDF passwordUnlock a PDF whose password you know.
Due date and ovulationOvulation window and estimated due date.
Ovulation calculatorOvulation date and fertile window.
Period calendarYour next periods at a glance.
Pregnancy week calculatorHow many weeks pregnant you are.
Conception date calculatorEstimate when conception happened.
Macro calculatorYour daily macros in grams.
Random name pickerDraw winners from a list.
YouTube thumbnail in HDGrab any YouTube thumbnail.
Stylish bio and username generatorFancy fonts for your bio.
Convert an imageConvert images between formats.
Scan a QR codeRead any QR code.
Currency converterConvert 25+ currencies live.
Online translatorTranslate text into 30+ languages.
Translate a PDFTranslate a PDF page by page.
Loan payment calculatorMonthly payment and total loan cost.