All Free Tools
Browse calculators, calendars, timers and reference tools. The complete collection is below.
Time & planning
Time Zone Converter
Convert a date and time between world time zones. See the destination date, UTC offset and daylight saving time for your chosen moment.
Time & planningWorld Meeting Planner
Compare the same meeting across three time zones, with local dates and a working-hours indicator for every participant.
Time & planningWorld Clock
Check the current local time and date in cities around the world. Add a time zone to your clock board without creating an account.
Time & planningWork Hours Calculator
Calculate a seven-day timesheet with unpaid breaks, overnight shifts and totals in hours and minutes or decimal hours.
Time & planningTime Since Calculator
Measure elapsed time from a past date and time to now, with a live counter in total days, hours, minutes and seconds.
Time & planningAdd & Subtract Durations
Add or subtract hours, minutes and seconds without treating them as decimal numbers or clock dates.
Time & planningDate & calendar
Printable Year Calendar
Print all twelve months on one page. Choose the year and the first day of the week, with optional holidays from the saved country dataset.
Date & calendarAge Calculator
Calculate age in completed years, months and days on any chosen date, along with the total number of days between the dates.
Date & calendarDate Duration Calculator
Find the number of days, weeks, and calendar years, months and days between two dates. Choose whether to include the end date.
Date & calendarBusiness Days Calculator
Count working days between two dates with a choice of weekends and a list of dates to exclude as holidays.
Date & calendarAdd or Subtract Days
Add or subtract a number of calendar days or weeks from a date to find a deadline, follow-up date or project milestone.
Date & calendarDay of the Week Calculator
Find which day of the week any Gregorian date falls on, plus its day number in the year and whether it is a leap year.
Date & calendarISO Week Number Calculator
Find the ISO 8601 week number and week-year for a date, together with the Monday and Sunday of that week.
Date & calendarPrintable Monthly Calendar
View and print a clean Gregorian monthly calendar, with Monday or Sunday as the first day of the week.
Date & calendarChinese Calendar Date Converter
Convert a Gregorian date to its Chinese calendar year, month and day using your browser’s built-in calendar support.
Date & calendarHijri Date Converter
Convert a Gregorian date to an Islamic calendar date using either the civil tabular calendar or the Saudi Umm al-Qura calendar.
Date & calendarEveryday calculators
Discount Calculator
Work out a sale price, savings and the combined effect of two successive discounts.
Everyday calculatorsTip & Bill Split Calculator
Calculate a percentage tip and split a bill between people, with a clear total and rounded shares.
Everyday calculatorsSales Tax Calculator
Add an entered tax rate to a price or extract the tax already included in a total.
Everyday calculatorsMargin & Markup Calculator
Compare gross margin and markup from a cost and selling price without mixing their denominators.
Everyday calculatorsSquare Footage Calculator
Calculate a rectangle’s area in square feet and square metres from matching length measurements.
Everyday calculatorsAverage Speed Calculator
Calculate average speed from kilometres travelled and elapsed minutes, with km/h, mph and m/s results.
Everyday calculatorsFuel Economy Converter
Convert litres per 100 kilometres, US miles per gallon and imperial miles per gallon.
Everyday calculatorsAspect Ratio Calculator
Reduce image dimensions to an aspect ratio and find a proportional height for a new width.
Everyday calculatorsPixel Density Calculator
Estimate a display’s pixels per inch from its resolution and active-screen diagonal.
Everyday calculatorsNumbers & text
Unix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to UTC dates, or turn an ISO 8601 date and time into a timestamp.
Numbers & textRoman Numeral Converter
Convert whole numbers from 1 to 3999 to Roman numerals, or validate and convert standard Roman numerals back to numbers.
Numbers & textPercentage Calculator
Calculate a percentage of a number, find what percentage one number is of another, or measure percentage increase and decrease.
Numbers & textUnit Converter
Convert length, mass, temperature and duration units, with clear source and destination units beside every result.
Numbers & textWord & Character Counter
Count words, characters, sentences and paragraphs as you type. Estimate reading time at your chosen reading speed, entirely in your browser.
Numbers & textRatio Simplifier & Split Calculator
Simplify a whole-number ratio and divide a total into two proportional shares.
Numbers & textAverage, Median & Range Calculator
Find the mean, median, sum, range and extremes of a list of numbers.
Numbers & textFraction Calculator
Add, subtract, multiply or divide two fractions and reduce the answer to lowest terms.
Numbers & textScientific Notation Converter
Convert ordinary numbers and E notation into a normalized scientific-notation display.
Numbers & textGCD & LCM Calculator
Find the greatest common divisor and least common multiple of two positive integers.
Numbers & textRounding Calculator
Round to decimal places or powers of ten, with explicit nearest, floor and ceiling rules.
Numbers & textRandom Number Generator
Generate a bounded list of random integers, with an option to prevent duplicates.
Numbers & textReading Time Calculator
Estimate reading duration from text and a pace you choose, with a visible word count.
Numbers & textText Case Converter
Change text to uppercase, lowercase, simple title case or sentence case in your browser.
Numbers & textRemove Duplicate Lines
Remove repeated lines while keeping the first occurrence and original list order.
Numbers & textSort Lines
Sort a plain-text list alphabetically or numerically in ascending or descending order.
Numbers & textWhitespace Cleaner
Trim line edges, collapse repeated spaces, remove blank lines or turn text into one line.
Numbers & textDeveloper tools
Number Base Converter
Convert signed whole numbers between binary, octal, decimal, hexadecimal and bases 2–36.
Developer toolsDigital Storage Converter
Convert bytes, decimal storage units and binary units without confusing GB and GiB.
Developer toolsText Difference Checker
Compare two text versions line by line and see inserted, removed and unchanged lines.
Developer toolsJSON Formatter & Validator
Validate JSON, indent it for reading or remove extra whitespace while preserving original number tokens.
Developer toolsURL Component Encoder & Decoder
Encode text for a URL component or decode percent escapes, with an explicit form-style plus option.
Developer toolsBase64 Encoder & Decoder
Encode UTF-8 text as Base64 or decode standard and URL-safe Base64 back to text.
Developer toolsHTML Entity Encoder & Decoder
Encode special HTML characters or decode named and numeric character references as plain text.
Developer toolsHEX, RGB & HSL Color Converter
Convert a three- or six-digit HEX colour or an integer RGB triplet into HEX, RGB and HSL.
Developer toolsSHA Hash Generator
Calculate SHA-256, SHA-384 or SHA-512 hashes of UTF-8 text directly in your browser.
Developer toolsUUID v4 Generator
Generate one or a batch of random version 4 UUIDs using your browser’s cryptographic random source.
Developer toolsJWT Decoder
Inspect a three-part JWT’s header, payload and UTC claim dates without uploading the token.
Developer toolsJSON to CSV Converter
Turn a JSON array of objects into CSV, with quoted fields and optional spreadsheet formula protection.
Developer toolsCSV to JSON Converter
Convert CSV headers and rows into JSON objects while preserving leading zeros and large identifiers as strings.
Developer toolsQuery String Parser
Inspect URL query parameters in order, including repeated keys, empty values and decoded form-query text.
Developer toolsText to Hex Converter
Encode text as hexadecimal UTF-8 bytes or decode a hex byte sequence back to text.
Developer toolsUnicode Inspector
See code points, UTF-16 length and UTF-8 bytes to investigate invisible characters and text differences.
Developer toolsJSON String Escape & Unescape
Convert plain text into a JSON string literal or decode a quoted JSON string back into plain text.
Developer toolsUTF-8 Byte Size Calculator
Measure UTF-8 bytes, Unicode code points and UTF-16 code units before sending or storing text.
Developer toolsPassword Generator
Create random passwords locally with configurable length, symbols and a browser cryptographic random source.
Developer toolsURL Slug Generator
Turn a heading into a lowercase, hyphen-separated slug with ASCII or Unicode letter support.
Developer toolsJSON Pointer Lookup
Select a value from a JSON document using a standard slash-separated JSON Pointer.
Developer toolsJSON Compare
Compare two JSON values structurally, ignoring object key order while retaining array order and value types.
Developer toolsHTTP Header Parser
Read pasted HTTP headers as ordered fields and grouped names while retaining repeated values.
Developer toolsCSV to HTML Table
Generate escaped HTML table source from CSV, including column headers and a simple semantic structure.
Developer toolsFocus & timers
Online Timer
Set a countdown timer for cooking, study or breaks. Pause, resume and reset it, with an optional sound when the time is up.
Focus & timersPomodoro Timer
Work in focused intervals with a simple 25-minute focus timer and a 5-minute break. Change the duration to fit your day.
Focus & timersOnline Stopwatch
Measure elapsed time with start, pause, reset and lap recording. Copy your lap list when you are done.
Focus & timersDate Countdown
Count down to a future date and time in days, hours, minutes and seconds, using your device’s local time zone.
Focus & timersFaith & reference
Monthly Prayer Calendar
Print a month of prayer times for your city. Choose the calculation method and Asr school, then save a PDF or download the timetable as CSV.
Faith & referenceRamadan Calendar
Find sehri and iftar times for Ramadan in your city, with a full printable timetable, local time zone and calculation settings.
Faith & referenceZakat Calculator
Estimate 2.5% of your net zakatable assets using asset values, deductible liabilities and a nisab threshold that you enter.
Faith & referencePublic Holiday Reference
Browse holidays and observances for 230 countries, with full saved lists, regional details, download dates and CSV exports.
Faith & referencePrayer Times by City
Search your country and city for daily prayer times, a printable monthly timetable and a Ramadan calendar with sehri and iftar times.
Faith & referenceSunrise, Sunset & Moon Phase
Estimate sunrise, sunset and moon illumination for a date and coordinates, with solar times shown in a time zone you choose.
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