Everyday tools that just work

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Find the right tool for the job.

• Date & TimeCalculators and converters for dates, ages and timestamps.8 Tools
• DeveloperUtilities for formatting, validating and converting data while you code.12 Tools
• TextHandy tools for working with text and strings.5 Tools
• NetworkCalculators for IP addresses, subnets and networks.1 Tools
• Unit ConversionConvert between metric and imperial units of length, weight, volume and more.8 Tools
• CalculatorsEveryday calculators for loans, savings, fuel, electricity and more.6 Tools
• HealthSimple health calculators based on standard formulas.6 Tools

• Length

  Featured

  Convert between metres, feet, inches, miles, kilometres and more.

  Unit ConversionOpen tool
• Area

  Convert between square metres, square feet, hectares, acres and mu.

  Unit ConversionOpen tool
• Weight

  Convert between kilograms, pounds, ounces, jin and liang.

  Unit ConversionOpen tool
• Volume

  Convert between litres, millilitres, gallons, cups and cubic metres.

  Unit ConversionOpen tool
• Temperature

  Convert between Celsius, Fahrenheit and Kelvin.

  Unit ConversionOpen tool
• Speed

  Convert between km/h, mph, m/s, ft/s and knots.

  Unit ConversionOpen tool
• Time

  Convert between seconds, minutes, hours, days, weeks and years.

  Unit ConversionOpen tool
• Data storage

  Convert between bits, bytes, KB, MB, GB, TB and PB (1024-based).

  Unit ConversionOpen tool
• Age Calculator

  Featured

  Find your exact age in years, months and days, plus total weeks, hours and your next birthday.

  Date & TimeOpen tool
• JSON Formatter

  Featured

  Format, minify and validate JSON with optional key sorting — directly in your browser.

  DeveloperOpen tool
• Unix Timestamp Converter

  Featured

  Convert between Unix timestamps and human-readable dates in both directions.

  Date & TimeOpen tool
• Random Password Generator

  Featured

  Create strong random passwords with a custom length, character sets and look-alike filtering.

  DeveloperOpen tool
• Subnet Calculator

  Featured

  Work out the network address, broadcast, mask and host range from an IPv4 CIDR block, and split it into subnets.

  NetworkOpen tool
• Word Counter

  Featured

  Count words, characters, sentences and paragraphs, with an estimated reading time.

  TextOpen tool
• Slug Generator

  Turn any text into a clean, URL-friendly slug.

  TextOpen tool
• Remove Duplicate Lines

  Remove duplicate lines from a list, with options for case, trimming and order.

  TextOpen tool
• Text Diff

  Compare two blocks of text line by line and see what was added or removed.

  TextOpen tool
• UUID Generator

  Generate random UUID v4 identifiers in bulk.

  DeveloperOpen tool
• Base64 Encoder / Decoder

  Encode text to Base64 or decode Base64 back to text, with a URL-safe option.

  DeveloperOpen tool
• URL Encoder / Decoder

  Percent-encode text for use in a URL, or decode an encoded URL back to text.

  DeveloperOpen tool
• Hash Generator

  Compute MD5, SHA-1, SHA-256 and SHA-512 hashes of any text, in your browser.

  DeveloperOpen tool
• JWT Decoder

  Decode a JSON Web Token to inspect its header and payload claims.

  DeveloperOpen tool
• HTML Entity Encoder / Decoder

  Escape text into HTML entities or decode entities back into plain text.

  DeveloperOpen tool
• Regex Tester

  Test a regular expression against sample text and inspect the matches and groups.

  DeveloperOpen tool
• JSON ↔ CSV Converter

  Convert a JSON array of objects into CSV, or parse CSV back into JSON.

  DeveloperOpen tool
• Cron Expression Explainer

  Understand a cron expression and see when it will next run.

  DeveloperOpen tool
• Number Base Converter

  Convert numbers between binary, octal, decimal and hexadecimal, or any base from 2 to 36.

  DeveloperOpen tool
• Case Converter

  Switch text between upper case, lower case, title case, camelCase, snake_case and more.

  TextOpen tool
• Loan Calculator

  Featured

  Estimate monthly payments, total interest and the full schedule for a loan.

  CalculatorsOpen tool
• Deposit Interest Calculator

  Work out simple or compound interest on a deposit and see the final balance.

  CalculatorsOpen tool
• Interest Rate Converter

  Convert between annual, monthly and daily interest rates.

  CalculatorsOpen tool
• Stock Fee Calculator

  Estimate commission, stamp duty and transfer fees for a stock or ETF trade.

  CalculatorsOpen tool
• Fuel Cost Calculator

  Work out the fuel used and the cost of a trip from distance, consumption and price.

  CalculatorsOpen tool
• Electricity Cost Calculator

  Estimate how much an appliance costs to run from its power rating and usage.

  CalculatorsOpen tool
• BMI Calculator

  Featured

  Calculate body mass index and see the WHO weight category.

  HealthOpen tool
• Water Intake Calculator

  Estimate how much water to drink each day based on weight and activity.

  HealthOpen tool
• Safe Period Calculator

  Estimate the fertile window from your last period and average cycle length.

  HealthOpen tool
• Due Date Calculator

  Estimate a delivery date with Naegele's rule and view the trimesters.

  HealthOpen tool
• Child Blood Type Calculator

  See the possible blood types a child can inherit from two parents.

  HealthOpen tool
• Child Height Predictor

  Predict a child's adult height from the parents' heights.

  HealthOpen tool
• Date Difference Calculator

  Featured

  Work out the difference between two dates in years, months, days and business days.

  Date & TimeOpen tool
• Future Date Calculator

  Add or subtract days, weeks, months or years from a date.

  Date & TimeOpen tool
• World Clock

  See the current time in major cities around the world, updated live.

  Date & TimeOpen tool
• Countdown Timer

  Count down live to a date and time you choose.

  Date & TimeOpen tool
• Online Stopwatch

  A millisecond stopwatch with start, pause, reset and lap.

  Date & TimeOpen tool
• Shelf Life Calculator

  Work out an expiry date and the days remaining from a production date and shelf life.

  Date & TimeOpen tool