Does my data get uploaded anywhere?
No. Everything runs locally in your browser and nothing is sent to a server.
Is this free to use?
Yes. It is completely free, with no account, no signup, and no usage limits.
Does it work on a phone?
Yes. The page runs in any modern mobile browser, on iPhone and Android alike, with no app to install.
How do I convert a temperature difference, like a 10 degree drop?
Do not put the difference into this page. A difference converts by scale only, with no offset: multiply a Celsius difference by 1.8 to get Fahrenheit degrees, and a Celsius difference equals a Kelvin difference exactly. So a 10 C drop is an 18 F drop, not 50 F.
At what temperature do Celsius and Fahrenheit read the same?
At -40. It is the crossing point of the two scales, because Fahrenheit runs 1.8 times steeper but starts 32 degrees higher. Enter -40 in either unit and the other reads -40.
What is 350 F in Celsius?
350 F is 176.667 C, which most recipes round to 175 C or 180 C. The formula is (F - 32) / 1.8, which is exactly what the tool runs.
Why does entering -300 C give an answer?
The converter does pure arithmetic and does not check physics, so it will convert any finite number you type. Absolute zero is -273.15 C, so anything below that is not a real temperature even though the tool prints a value for it.
Should Kelvin be written with a degree sign?
No. Kelvin is written as 300 K, never 300 degrees K, because it is an absolute scale rather than a scale of degrees above an arbitrary zero. The tool labels it K for that reason.
What counts as a fever in Fahrenheit?
38 C, the usual clinical threshold, is 100.4 F. Normal body temperature of 37 C is 98.6 F, and 39 C is 102.2 F.