🔄 Converter Tools
Unit, temperature, currency and color converters
Length, weight, volume and more
Open tool →Celsius to Fahrenheit, Kelvin — instant temperature conversion calculator.
Open tool →Live exchange rates worldwide. Free online currency converter and forex calculator.
Open tool →HEX, RGB, HSL and CSS values
Open tool →Generate QR codes for URLs, text, WiFi, and more. Free online QR code maker.
Open tool →Unit, temperature, currency and colour conversion, plus a QR code generator. The conversions you need mid-task and do not want to leave the page for.
Unit and colour conversion happens locally. Currency has to fetch published rates, since exchange rates are not something a browser can know — that is the one request this category makes, and it sends no amounts.
Which tool do I want?
| If you… | Use |
|---|---|
| You need length, weight, volume, area or speed | Unit Converter |
| Celsius, Fahrenheit or Kelvin | Temperature Converter |
| You need a currency amount at current rates | Currency Converter |
| You have a hex, RGB or HSL value to convert | Color Converter |
| You need a QR code for a link or text | QR Code Generator |
Ounces, gallons and tons are not one unit each
The imperial system quietly forked. A US fluid ounce is 29.57 ml; an imperial one is 28.41 ml. A US gallon is 3.785 litres against the imperial 4.546 — a 20% gap, which is why a car's stated fuel economy shifts depending on which side of the Atlantic quoted it.
Weight has the same trap. A US short ton is 2000 lb, a UK long ton 2240 lb, and a metric tonne 1000 kg, or about 2205 lb. Three different quantities sharing a name.
And "ounce" spans two dimensions: a fluid ounce measures volume, an ounce measures mass, and they are only interchangeable for water by coincidence of definition. A recipe calling for 8 oz of flour means weight; 8 fl oz of milk means volume. Converting one as the other is how baking goes wrong.