Unit Converter
Switch between meters and feet, Celsius and Fahrenheit, megabytes and gigabytes — plus hex, binary, and octal number-base conversions. Also handles JSON ↔ XML format swapping for when you need to bridge between systems.
Unit Converter
Length Unit Converter
Online length unit converter for kilometers, meters, centimeters, millimeters, miles, yards, feet, inches, nautical miles, and Chinese units.
Temperature Unit Converter
Online temperature converter for Celsius, Fahrenheit, and Kelvin. Get accurate instant conversions for weather, science, cooking, and baking.
Area Unit Converter
Online area unit converter for square kilometers, hectares, ares, square meters, square centimeters, mu, acres, square feet, and more.
Weight Unit Converter
Online weight unit converter for metric tons, kilograms, grams, milligrams, pounds, ounces, jin, liang, and more with instant results.
Volume Unit Converter
Online volume unit converter for cubic meters, liters, milliliters, gallons, cubic feet, cubic inches, and more with instant results.
Energy Unit Converter
Online energy unit converter for joules, kilojoules, kilowatt-hours, calories, kilocalories, BTU, electron-volts, and more.
Power Unit Converter
Online power unit converter between W, kW, MW, GW, mW, horsepower, metric horsepower, BTU/h, kcal/h, ft·lbf/s and refrigeration tons.
Pressure Unit Converter
Free online pressure converter for Pa, kPa, MPa, bar, atm, psi, mmHg, inHg, mH₂O and kgf/cm². Metric and imperial, instant.
Speed Unit Converter
Online speed unit converter between m/s, km/h, mph, knots, Mach, ft/s and more — 12 units for driving, aviation, marine and physics.
Data Storage Unit Converter
Free online data storage converter for bits, bytes, KB, MB, GB, TB, PB, EB plus binary KiB, MiB, GiB, TiB, PiB, EiB. Instant.
Base Conversion Tool
Free online number base converter for binary, octal, decimal, hexadecimal, and custom bases. Convert numbers instantly and copy results.
What this category can do
Converter tools change units, bases or equivalent data representations. This category includes physical units such as length, temperature, area, weight, volume and energy, plus data storage, number bases and JSON/XML conversion. Use it when the value or representation changes; use formatters when only layout changes.
Most tools process input in the browser when possible. For files, tokens, documents or network checks, review the selected tool before using sensitive data.
Common use cases
- Convert metric and imperial measurements for dimensions, weight, volume or temperature.
- Switch between bits, bytes and larger storage units when estimating file size or bandwidth.
- Convert number bases or move structured data between JSON and XML for integration work.
FAQ
Why are there rounding differences?
Many conversions use decimal values or approximate constants. Keep more precision for engineering work.
Are storage units based on 1000 or 1024?
KB and KiB are different labels. Choose the unit that matches your source or target system.
Can every JSON become clean XML?
Not always. Arrays, attributes and repeated names require conventions that JSON may not contain.
Can I use results for regulated work?
Use them for everyday checks. Verify official constants and rounding rules for legal, medical, financial or safety-critical use.
Related Categories
Encoding & Decoding
Data rarely arrives in the format you need. Encode to Base64, URL-encode a string, escape JSON, convert CSV to SQL, decode QR codes, zip or unzip files, and more. Most encoding tools run entirely in your browser, so common conversions stay on your device.
Date & Time
How many workdays until the deadline? What's your baby's age in days? When should you sleep to wake up refreshed? Timestamp converters, countdown timers, age calculators, lunar calendars, world clocks, Pomodoro timers — all the date math you'd rather not do by hand.
Document Conversion
Turn Office files into PDFs, pull editable text out of PDFs back into Word, or export each page as an image. Some tools (PDF viewer, Mermaid) run in the browser; Office↔PDF conversion uses a server-side engine for performance — uploaded files are removed immediately after conversion.
