๐ก๏ธ Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin in real time โ useful for reading overseas weather forecasts, recipes, or science calculations. Enter a value in any of the three fields and the others recalculate instantly.
How to use
- Enter a value into any field โ Celsius (ยฐC), Fahrenheit (ยฐF), or Kelvin (K).
- The other two fields update with the converted value in real time.
- To convert a different temperature, just overwrite the number.
How the calculation works
Unlike length or weight, temperature cannot be converted with a simple multiplication, because each scale puts zero in a different place. Celsius sets water's freezing point at 0ยฐC and boiling point at 100ยฐC. Fahrenheit splits the same interval into 180 steps, from 32ยฐF to 212ยฐF, so one Celsius degree spans 1.8 Fahrenheit degrees. The formulas are therefore ยฐF = ยฐC ร 9/5 + 32 and ยฐC = (ยฐF โ 32) ร 5/9. Kelvin is the unit of thermodynamic temperature. It places zero at absolute zero, the theoretical lowest possible temperature, and uses the same step size as Celsius, so K = ยฐC + 273.15. Kelvin has no negative values and is written without a degree sign.
Worked example
Converting an oven setting of 350ยฐF to Celsius (350 โ 32) ร 5 รท 9 = 318 ร 5 รท 9 โ 176.7ยฐC 180ยฐC is the nearest common setting. Going back, 180ยฐC is 180 ร 9 รท 5 + 32 = 356ยฐF. A neat curiosity: โ40 is the one point where both scales read the same, โ40ยฐC = โ40ยฐF.
Things to be aware of
- Converting a temperature differs from converting a temperature difference. A rise of 10ยฐC is a rise of 18ยฐF โ the +32 does not apply.
- Nothing can be colder than absolute zero: 0K = โ273.15ยฐC = โ459.67ยฐF.
- Oven thermostats vary between models; treat converted settings as a guide.
- A normal body temperature of 36.5ยฐC is about 97.7ยฐF.
FAQ
What's the formula from Fahrenheit to Celsius?
ยฐC = (ยฐF โ 32) ร 5/9. This tool calculates it automatically, so you just enter a value.
When would I use Kelvin?
It's mainly used in science and engineering as an absolute temperature scale, where 0 K equals absolute zero (โ273.15ยฐC).
Can I check an overseas recipe's oven temperature in ยฐF?
Yes โ enter the ยฐF value and it converts to ยฐC automatically, so you can follow a recipe written in Fahrenheit.
Can I convert a US weather forecast in Fahrenheit?
Yes โ enter the Fahrenheit reading and it instantly converts to Celsius.
Can I enter negative temperatures?
Yes โ both Celsius and Fahrenheit accept negative values, and conversions stay accurate as long as they don't go below absolute zero.