All tools

Calculators and converters for dates, ages and timestamps.

• Age Calculator

  Featured

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

  Date & TimeOpen tool
• Unix Timestamp Converter

  Featured

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

  Date & TimeOpen 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

Utilities for formatting, validating and converting data while you code.

• JSON Formatter

  Featured

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

  DeveloperOpen tool
• Random Password Generator

  Featured

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

  DeveloperOpen 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

Handy tools for working with text and strings.

• 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
• Case Converter

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

  TextOpen tool

Calculators for IP addresses, subnets and networks.

• 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

Convert between metric and imperial units of length, weight, volume and more.

• 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

Everyday calculators for loans, savings, fuel, electricity and more.

• 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

Simple health calculators based on standard formulas.

• 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