Useful tools.
Instant answers.
High-demand calculators, date and time tools, unit converters, text, developer, color, and image utilities that work directly in your browser.
Calculators
Calculator
A fast online calculator for everyday arithmetic.
CalculatorsTip Calculator
Calculate tip amount, total bill, and per-person split instantly.
CalculatorsPercentage Calculator
Calculate percentages quickly for common everyday questions.
CalculatorsPercentage Change Calculator
Calculate percentage increase or decrease between two values.
CalculatorsDiscount Calculator
Calculate sale price, savings, and discount percentage.
CalculatorsAverage Calculator
Calculate the arithmetic mean of a list of numbers.
CalculatorsRatio Calculator
Simplify ratios and compare proportional values.
CalculatorsFraction Calculator
Add, subtract, multiply, or divide two fractions.
CalculatorsLCM Calculator
Find the least common multiple of two or more whole numbers.
CalculatorsGCF Calculator
Find the greatest common factor of two or more whole numbers.
CalculatorsGPA Calculator
Estimate GPA from course grades and credit hours.
CalculatorsVolume Calculator
Calculate volume for common 3D shapes.
CalculatorsDecimal to Fraction Calculator
Convert a decimal number to a simplified fraction.
CalculatorsFraction to Decimal Calculator
Convert a fraction to its decimal value instantly.
CalculatorsSquare Root Calculator
Calculate the square root of any non-negative number.
CalculatorsPercent Difference Calculator
Calculate percent difference between two values.
CalculatorsScientific Calculator
Use common scientific functions including powers, roots, logs, and trigonometry.
CalculatorsCircle Area Calculator
Calculate the area and circumference of a circle from its radius.
CalculatorsTriangle Area Calculator
Calculate triangle area from base and height.
CalculatorsStandard Deviation Calculator
Calculate mean, population standard deviation, and sample standard deviation.
CalculatorsQuadratic Formula Calculator
Solve quadratic equations in the form ax² + bx + c = 0.
CalculatorsMean Median Mode Calculator
Calculate mean, median, mode, range, and count from a list of numbers.
CalculatorsWeighted Average Calculator
Calculate a weighted average from values and weights.
CalculatorsExponent Calculator
Calculate powers using any base and exponent.
CalculatorsFactorial Calculator
Calculate n factorial for a non-negative whole number.
CalculatorsModulo Calculator
Calculate the modulo of two integers.
CalculatorsPrime Number Checker
Check whether a whole number is prime.
CalculatorsPrime Factorization Calculator
Find the prime factorization of a positive integer.
CalculatorsRemainder Calculator
Calculate quotient and remainder for integer division.
CalculatorsRounding Calculator
Round a number to a chosen number of decimal places.
CalculatorsSlope Calculator
Calculate slope from two coordinate points.
CalculatorsDistance Formula Calculator
Calculate the distance between two coordinate points.
CalculatorsMidpoint Calculator
Calculate the midpoint between two coordinate points.
CalculatorsPythagorean Theorem Calculator
Solve a right triangle using the Pythagorean theorem.
CalculatorsRectangle Area Calculator
Calculate rectangle area from length and width.
CalculatorsRectangle Perimeter Calculator
Calculate rectangle perimeter from length and width.
CalculatorsCircumference Calculator
Calculate a circle circumference from radius or diameter.
CalculatorsSphere Volume Calculator
Calculate the volume of a sphere from its radius.
CalculatorsCylinder Volume Calculator
Calculate cylinder volume from radius and height.
CalculatorsCone Volume Calculator
Calculate cone volume from radius and height.
CalculatorsPercentage Increase Calculator
Calculate percentage increase from an old value to a new value.
CalculatorsPercentage Decrease Calculator
Calculate percentage decrease from an old value to a new value.
CalculatorsPercent to Decimal Calculator
Convert a percentage to a decimal instantly.
CalculatorsDecimal to Percent Calculator
Convert a decimal number to a percentage instantly.
CalculatorsFraction to Percent Calculator
Convert a fraction to a percentage.
CalculatorsCube Root Calculator
Calculate the real cube root of a number.
CalculatorsAbsolute Value Calculator
Find the absolute value of a number.
CalculatorsLog Calculator
Calculate a logarithm with a custom base.
CalculatorsSum Calculator
Add a list of numbers instantly.
CalculatorsMedian Calculator
Calculate the median of a list of numbers.
CalculatorsMode Calculator
Find the most frequent value or values in a list.
CalculatorsRange Calculator
Calculate the range of a list of numbers.
CalculatorsVariance Calculator
Calculate population and sample variance.
CalculatorsPermutation Calculator
Calculate permutations nPr.
CalculatorsCombination Calculator
Calculate combinations nCr.
CalculatorsCube Volume Calculator
Calculate the volume of a cube from its side length.
CalculatorsSphere Surface Area Calculator
Calculate the surface area of a sphere.
Finance Calculators
Mortgage Calculator
Estimate monthly principal and interest for a fixed-rate mortgage.
Finance CalculatorsLoan Calculator
Estimate monthly payments and total interest for a fixed installment loan.
Finance CalculatorsCompound Interest Calculator
Estimate how an initial balance grows with compound interest.
Finance CalculatorsSimple Interest Calculator
Estimate simple interest from principal, annual rate, and time.
Finance CalculatorsSavings Calculator
Estimate future savings with recurring deposits and compound growth.
Finance CalculatorsProfit Margin Calculator
Calculate profit margin from revenue and cost.
Finance CalculatorsMarkup Calculator
Calculate markup percentage from cost and selling price.
Finance CalculatorsProfit Calculator
Calculate profit from revenue and total cost.
Finance CalculatorsSales Tax Calculator
Calculate sales tax and total price from a user-entered tax rate.
Finance CalculatorsCommission Calculator
Calculate commission from sales and commission rate.
Finance CalculatorsBreak-Even Calculator
Estimate break-even units from fixed cost, price, and variable cost.
Finance CalculatorsROI Calculator
Calculate return on investment from gain and cost.
Date & Time
Age Calculator
Calculate exact age from a birth date to today or another date.
Date & TimeDate Calculator
Add or subtract days from a calendar date.
Date & TimeDay Counter
Count the number of days between two calendar dates.
Date & TimeBusiness Days Calculator
Count weekdays between two dates.
Date & TimeTime Calculator
Add or subtract hours and minutes from a starting time.
Date & TimeTime Duration Calculator
Calculate the exact duration between two times.
Date & TimeCountdown Timer
Run a simple countdown timer in your browser.
Date & TimeHours Calculator
Calculate hours between a start and end time.
Date & TimeTime Card Calculator
Add multiple work shifts and calculate total hours.
Date & TimeDays From Today Calculator
Calculate a date a chosen number of days from today.
Date & TimeOnline Stopwatch
Run a simple stopwatch with start, pause, and reset controls.
Date & TimeMinutes to Hours Converter
Convert minutes to decimal hours and hours/minutes.
Date & TimeHours to Minutes Converter
Convert hours to minutes instantly.
Date & TimeSeconds to Minutes Converter
Convert seconds to minutes and seconds.
Date & TimeWeeks Between Dates Calculator
Calculate weeks and days between two calendar dates.
Date & TimeMonths Between Dates Calculator
Estimate complete calendar months between two dates.
Date & TimeWeekday Calculator
Find the day of the week for any calendar date.
Date & TimeToday’s Date
Show today’s date in several common formats.
Date & TimeOnline Timer
Set and run a free online timer in your browser.
Date & TimeDate Countdown Calculator
Count down the days, hours, and minutes to a future date.
Date & TimeUnix Timestamp Converter
Convert Unix timestamps to local date-time and back.
Date & TimeTime Zone Converter
Convert a date and time between common world time zones.
Date & TimeDay of Year Calculator
Find the day number within the year for any date.
Date & TimeWeek Number Calculator
Find the ISO week number for a calendar date.
Date & TimeLeap Year Calculator
Check whether a year is a leap year.
Date & TimeTime to Decimal Converter
Convert hours and minutes to decimal hours.
Date & TimeDecimal to Time Converter
Convert decimal hours to hours and minutes.
Date & TimeDays in Month Calculator
Find the number of days in any month and year.
Date & TimeOnline Alarm Clock
Set an alarm for a specific local time in your browser.
Date & TimeWorld Clock
See the current time across major world time zones.
Date & TimeMinutes to Seconds Converter
Convert minutes to seconds instantly.
Date & TimeSeconds to Hours Converter
Convert seconds to hours instantly.
Date & TimeHours to Seconds Converter
Convert hours to seconds instantly.
Date & TimeDays to Hours Converter
Convert days to hours instantly.
Date & TimeYears Between Dates Calculator
Calculate elapsed years between two dates.
Date & TimeMonths From Date Calculator
Add or subtract months from a date.
Converters
Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius and Celsius to Fahrenheit instantly.
ConvertersCM to Inches Converter
Convert centimeters to inches instantly.
ConvertersInches to CM Converter
Convert inches to centimeters instantly.
ConvertersKG to LBS Converter
Convert kilograms to pounds instantly.
ConvertersLBS to KG Converter
Convert pounds to kilograms instantly.
ConvertersMiles to KM Converter
Convert miles to kilometers instantly.
ConvertersKM to Miles Converter
Convert kilometers to miles instantly.
ConvertersMeters to Feet Converter
Convert meters to feet instantly.
ConvertersML to Cups Converter
Convert milliliters to US cups instantly.
ConvertersMM to Inches Converter
Convert millimeters to inches instantly.
ConvertersFeet to Meters Converter
Convert feet to meters instantly.
ConvertersMeters to CM Converter
Convert meters to centimeters instantly.
ConvertersFeet to Inches Converter
Convert feet to inches instantly.
ConvertersInches to Feet Converter
Convert inches to feet instantly.
ConvertersYards to Meters Converter
Convert yards to meters instantly.
ConvertersLiters to Gallons Converter
Convert liters to US gallons instantly.
ConvertersGallons to Liters Converter
Convert US gallons to liters instantly.
ConvertersOunces to Grams Converter
Convert ounces to grams instantly.
ConvertersGrams to Ounces Converter
Convert grams to ounces instantly.
ConvertersCups to ML Converter
Convert US cups to milliliters instantly.
ConvertersTeaspoons to Tablespoons Converter
Convert teaspoons to tablespoons instantly.
ConvertersMPH to KPH Converter
Convert miles per hour to kilometers per hour.
ConvertersKPH to MPH Converter
Convert kilometers per hour to miles per hour.
ConvertersSquare Feet to Square Meters Converter
Convert square feet to square meters instantly.
ConvertersBytes to KB Converter
Convert bytes to kibibytes using 1024 bytes per KiB.
ConvertersKB to MB Converter
Convert kilobytes to megabytes using a 1024-based conversion.
ConvertersMB to GB Converter
Convert megabytes to gigabytes using a 1024-based conversion.
ConvertersBinary Converter
Convert between binary and decimal numbers instantly.
ConvertersHex Converter
Convert between hexadecimal and decimal numbers instantly.
ConvertersCelsius to Fahrenheit Converter
Convert Celsius to Fahrenheit instantly.
ConvertersCelsius to Kelvin Converter
Convert Celsius to Kelvin instantly.
ConvertersKelvin to Celsius Converter
Convert Kelvin to Celsius instantly.
ConvertersInches to MM Converter
Convert inches to millimeters instantly.
ConvertersCM to Feet Converter
Convert centimeters to feet instantly.
ConvertersFeet to CM Converter
Convert feet to centimeters instantly.
ConvertersMeters to Yards Converter
Convert meters to yards instantly.
ConvertersYards to Feet Converter
Convert yards to feet instantly.
ConvertersMiles to Feet Converter
Convert miles to feet instantly.
ConvertersMeters to Miles Converter
Convert meters to miles instantly.
ConvertersGrams to KG Converter
Convert grams to kilograms instantly.
ConvertersKG to Grams Converter
Convert kilograms to grams instantly.
ConvertersOunces to Pounds Converter
Convert ounces to pounds instantly.
ConvertersPounds to Ounces Converter
Convert pounds to ounces instantly.
ConvertersML to Ounces Converter
Convert milliliters to US fluid ounces instantly.
ConvertersOunces to ML Converter
Convert US fluid ounces to milliliters instantly.
ConvertersTablespoons to Cups Converter
Convert tablespoons to US cups instantly.
ConvertersCups to Tablespoons Converter
Convert US cups to tablespoons instantly.
ConvertersQuarts to Gallons Converter
Convert US quarts to gallons instantly.
ConvertersGallons to Quarts Converter
Convert US gallons to quarts instantly.
ConvertersAcres to Square Feet Converter
Convert acres to square feet instantly.
ConvertersSquare Feet to Acres Converter
Convert square feet to acres instantly.
ConvertersHectares to Acres Converter
Convert hectares to acres instantly.
ConvertersAcres to Hectares Converter
Convert acres to hectares instantly.
ConvertersCups to Ounces Converter
Convert US cups to fluid ounces instantly.
ConvertersOunces to Cups Converter
Convert US fluid ounces to cups instantly.
ConvertersPounds to Grams Converter
Convert pounds to grams instantly.
ConvertersGrams to Pounds Converter
Convert grams to pounds instantly.
ConvertersCM to Meters Converter
Convert centimeters to meters instantly.
ConvertersMeters to MM Converter
Convert meters to millimeters instantly.
ConvertersMM to CM Converter
Convert millimeters to centimeters instantly.
ConvertersCM to MM Converter
Convert centimeters to millimeters instantly.
ConvertersKM to Meters Converter
Convert kilometers to meters instantly.
ConvertersMeters to KM Converter
Convert meters to kilometers instantly.
ConvertersYards to Inches Converter
Convert yards to inches instantly.
ConvertersInches to Yards Converter
Convert inches to yards instantly.
ConvertersMiles to Yards Converter
Convert miles to yards instantly.
ConvertersTons to Pounds Converter
Convert US short tons to pounds.
ConvertersStone to Pounds Converter
Convert stone to pounds instantly.
ConvertersLiters to ML Converter
Convert liters to milliliters instantly.
ConvertersML to Liters Converter
Convert milliliters to liters instantly.
ConvertersCups to Pints Converter
Convert US cups to US pints.
ConvertersPints to Cups Converter
Convert US pints to US cups.
ConvertersPints to Quarts Converter
Convert US pints to US quarts.
ConvertersTablespoons to Teaspoons Converter
Convert tablespoons to teaspoons.
ConvertersTeaspoons to ML Converter
Convert US teaspoons to milliliters.
ConvertersSquare Meters to Square Feet Converter
Convert square meters to square feet.
ConvertersSquare Feet to Square Yards Converter
Convert square feet to square yards.
Random Tools
Random Number Generator
Generate random integers within a custom range.
Random ToolsCoin Flip
Flip a virtual coin instantly in your browser.
Random ToolsDice Roller
Roll one or more virtual dice with custom side counts.
Random ToolsRandom Picker
Pick one random item from a pasted list.
Random ToolsList Randomizer
Shuffle a list into random order.
Random ToolsPassword Generator
Generate a strong random password locally in your browser.
Text Tools
Word Counter
Count words, characters, sentences, and paragraphs as you type.
Text ToolsCharacter Counter
Count characters with and without spaces, plus words and lines.
Text ToolsCase Converter
Convert text to uppercase, lowercase, title case, or sentence case.
Text ToolsLine Counter
Count lines, non-empty lines, words, and characters.
Text ToolsRemove Duplicate Lines
Remove repeated lines from a block of text.
Text ToolsSort Lines
Sort lines alphabetically or numerically.
Text ToolsReading Time Calculator
Estimate reading time from pasted text and reading speed.
Text ToolsSpeaking Time Calculator
Estimate speaking time for a speech, script, or presentation.
Text ToolsSentence Counter
Count sentences, words, and characters in pasted text.
Text ToolsParagraph Counter
Count paragraphs, words, and characters in pasted text.
Text ToolsWord Frequency Counter
Count how often each word appears in a block of text.
Text ToolsWhitespace Remover
Remove extra spaces and normalize whitespace in text.
Text ToolsRemove Line Breaks
Join wrapped lines into clean paragraphs.
Text ToolsReverse Text
Reverse the characters in any text instantly.
Text ToolsTitle Case Converter
Convert text to title case.
Text ToolsUppercase Converter
Convert text to uppercase letters.
Text ToolsLowercase Converter
Convert text to lowercase letters.
Text ToolsSentence Case Converter
Convert text to sentence case.
Text ToolsRemove Extra Spaces
Remove repeated spaces and tidy whitespace.
Text ToolsRemove Blank Lines
Remove empty lines from text.
Text ToolsFind and Replace Text
Find and replace text directly in your browser.
Text ToolsText Difference Checker
Compare two blocks of text line by line.
Developer Tools
JSON Formatter
Format and beautify JSON directly in your browser.
Developer ToolsJSON Validator
Validate JSON syntax and show parse errors.
Developer ToolsJSON Minifier
Minify JSON by removing unnecessary whitespace.
Developer ToolsBase64 Encoder
Encode text as Base64 in your browser.
Developer ToolsBase64 Decoder
Decode Base64 to readable UTF-8 text.
Developer ToolsURL Encoder
Percent-encode text for use in URLs.
Developer ToolsURL Decoder
Decode percent-encoded URL text.
Developer ToolsUUID Generator
Generate random UUID v4 identifiers locally.
Developer ToolsHEX to RGB Converter
Convert a HEX color code to RGB values.
Developer ToolsRGB to HEX Converter
Convert RGB color values to a HEX code.
Developer ToolsText to Binary Converter
Convert UTF-8 text to binary bytes.
Developer ToolsBinary to Text Converter
Convert 8-bit binary bytes back to UTF-8 text.
Developer ToolsHTML Encoder
Escape special characters into HTML entities.
Developer ToolsHTML Decoder
Decode HTML entities into readable text.
Developer ToolsSlug Generator
Convert text into a clean URL slug.
Developer ToolsLorem Ipsum Generator
Generate placeholder Lorem Ipsum paragraphs locally.
Developer ToolsDecimal to Binary Converter
Convert a decimal integer to binary.
Developer ToolsBinary to Decimal Converter
Convert a binary integer to decimal.
Developer ToolsDecimal to Hex Converter
Convert a decimal integer to hexadecimal.
Developer ToolsHex to Decimal Converter
Convert a hexadecimal integer to decimal.
Developer ToolsCSV to JSON Converter
Convert simple CSV data to JSON in your browser.
Developer ToolsJSON to CSV Converter
Convert an array of JSON objects to CSV.
Developer ToolsRegex Tester
Test JavaScript regular expressions against sample text.
Developer ToolsSHA-256 Hash Generator
Generate a SHA-256 hash locally in your browser.
Developer ToolsXML Formatter
Format and validate XML directly in your browser.
Color Tools
Color Picker
Pick a color and view HEX and RGB values.
Color ToolsColor Wheel
Explore colors with HSL controls.
Color ToolsRGB to HSL Converter
Convert RGB color values to HSL.
Color ToolsHSL to RGB Converter
Convert HSL color values to RGB.
Color ToolsColor Contrast Checker
Check contrast ratio between two colors.
Image Tools
Image Resizer
Resize an image to custom pixel dimensions in your browser.
Image ToolsImage Compressor
Compress an image with adjustable JPEG or WebP quality locally.
Image ToolsJPG to PNG Converter
Convert JPG images to PNG directly in your browser.
Image ToolsPNG to JPG Converter
Convert PNG images to JPG directly in your browser.
Image ToolsJPG to WebP Converter
Convert JPG images to WebP in your browser.
Image ToolsPNG to WebP Converter
Convert PNG images to WebP in your browser.
Image ToolsWebP to JPG Converter
Convert WebP images to JPG in your browser.
Image ToolsWebP to PNG Converter
Convert WebP images to PNG in your browser.
Image ToolsRotate Image
Rotate an image by 90, 180, or 270 degrees.
Image ToolsFlip Image
Flip an image horizontally or vertically.
Image ToolsImage Dimensions Checker
Check image width, height, aspect ratio, and file size.
Image ToolsImage to Base64 Converter
Convert an image file to a Base64 data URL locally.