One converter for the units that come up most often: length, weight, temperature, area, volume, speed, time, pressure, energy and digital storage. Pick a category, type a value, and every unit in that category updates at once so you can read off whichever you need.
Every unit in a category is defined by its ratio to a single base unit, so a conversion is one multiplication and one division. That keeps the numbers exact where the definitions are exact - an inch is defined as precisely 25.4 mm, a pound as precisely 0.45359237 kg - rather than accumulating rounding through a chain of approximations.
Celsius and Fahrenheit have different zero points, so converting needs an offset as well as a scale: F = C x 9/5 + 32. This is also why you cannot convert a temperature difference the same way as a temperature. A rise of 10°C is a rise of 18°F, not 50°F.
A US gallon is 3.785 litres and an imperial gallon 4.546 - about 20% larger. Both are listed separately, as are US and imperial fluid ounces and pints. Digital storage has the same problem: manufacturers count a kilobyte as 1000 bytes while operating systems often use 1024, which is why a "1 TB" drive shows as 931 GB. Both conventions are included.
Because the Celsius and Fahrenheit scales have different zero points, so conversion needs an offset as well as a multiplication: F = C x 9/5 + 32. Kelvin shares the Celsius degree size but starts at absolute zero.
No. A US gallon is 3.785 litres, an imperial gallon is 4.546 litres - about 20% larger. The same split applies to pints and fluid ounces, which is a frequent source of ruined recipes.
Both conventions exist. Storage manufacturers use 1000, operating systems often use 1024. The unambiguous binary units are KiB, MiB and GiB. This converter offers both.
Steuervergleich Kanton Zürich — Gemeindesteuern vergleichen (Deutsch)