Converters
Every converter on the site, in one place - currency, everyday measurements, science and engineering units, and a few developer and design tools, grouped by what you're actually converting.
Every result updates instantly as you type, and nothing you enter is saved. Jump to a section, or scroll through all 20.
Everyday measurements
Length, weight, volume, time, and more.
- Length Converter - convert length and distance between metric and imperial units.
- Weight Converter - convert weight and mass between metric and imperial units.
- Volume Converter - convert cooking and liquid volume between cups, milliliters, gallons, and more.
- Temperature Converter - convert between Celsius, Fahrenheit, and Kelvin.
- Oven Temperature Converter - convert oven temperatures between Celsius, Fahrenheit, and UK Gas Mark.
- Speed Converter - convert between mph, km/h, m/s, and knots.
- Area Converter - convert land or floor area between square feet, acres, hectares, and more.
- Time Converter - convert between seconds, minutes, hours, days, and years.
- Time Zone Converter - convert a date and time from one city's time zone to another.
- Shoe Size Converter - convert shoe sizes between US, UK, EU, and centimeters.
- Fuel Economy Converter - convert fuel efficiency between MPG (US), MPG (UK), and L/100km.
Science & engineering
Angles, energy, power, and pressure.
- Angle Converter - convert between degrees, radians, gradians, and turns.
- Energy Converter - convert between joules, calories, kilowatt-hours, and BTU.
- Power Converter - convert between watts, kilowatts, horsepower, and BTU per hour.
- Pressure Converter - convert between PSI, bar, kPa, atmospheres, and mmHg.
Currency
Live exchange rates.
- Currency Converter - convert between major world currencies using live daily exchange rates.
Tech & design
For developers and designers.
- Color Converter (HEX/RGB) - convert colors between HEX and RGB, with a live preview swatch.
- Binary/Hex Converter - convert a number between decimal, binary, and hexadecimal.
- Data Storage Converter - convert file size between bytes, KB, MB, GB, and TB.
- Roman Numeral Converter - convert between numbers and Roman numerals.
Frequently asked questions
Are these converters free to use?
Yes - all 20 tools on this page are free, with no account or sign-up required.
Is the Currency Converter really using live rates?
Yes - it fetches daily reference exchange rates directly in your browser. If that connection ever fails, it clearly labels the result as an approximate rate instead of live.
A couple of these also appear in other categories - is that a mistake?
No, that's intentional. The Pressure Converter and Time Zone Converter are genuinely useful unit conversions, so they're listed here for discoverability even though their main home is under Engineering and Date & Time respectively - each links to the same single tool rather than a duplicate.
Is any of the information I enter saved?
No. Every calculation runs directly in your browser - nothing you type is sent to a server or stored anywhere.
Looking for a different category? Browse all calculators on the homepage. For articles and updates about these tools, see all Converters posts.