Temperature Converter
Converters · Added 9 August 2026
Convert a temperature between Celsius, Fahrenheit, Kelvin and Rankine — with the exact formula shown next to every result, so you can check the working.
Result
1 °C in fahrenheit
33.8 °F
°F = (°C × 9/5) + 32
The same value in every unit
- Celsius (°C)
- 1
- Fahrenheit (°F)
- 33.8
- Kelvin (K)
- 274.15
- Rankine (°R)
- 493.47
Temperature scales differ in where zero sits as well as in step size, so these are offset conversions rather than simple multiplications.
How to use the temperature converter
- 1Type the temperature in the Value box. Negative numbers are fine — enter −40 as -40.
- 2Select the scale it is in and the scale you want. The formula being applied appears directly under the answer.
- 3The panel below lists the same temperature on all four scales at once.
- 4Swap units reverses the conversion, which is handy for checking that a figure round-trips as you expect.
Examples
A warm day
- Input
- 30 °C
- Result
- 86 °F
The quick mental version — double it and add 30 — gives 90 °F. Close enough for deciding on a jacket, wrong for an oven.
Oven temperature from a US recipe
- Input
- 350 °F
- Result
- 176.666667 °C
Most ovens are set to the nearest 10, so this is the familiar 175 °C or gas mark 4.
Absolute zero
- Input
- 0 K
- Result
- −273.15 °C
Nothing can be colder. A negative Kelvin figure always means an input error somewhere.
About the temperature converter
Three scales, three different reference points
Celsius pins its scale to water: 0 for freezing and 100 for boiling at sea-level pressure. Fahrenheit's original reference points were a brine freezing mixture and human body temperature, which is why its numbers look arbitrary — water freezes at 32 and boils at 212.
Kelvin abandons reference substances entirely and starts at absolute zero, the point at which molecular motion is minimal. Because it shares Celsius's step size, scientific work can move between the two by adding or subtracting 273.15 and nothing else.
Reference points worth memorising
A handful of anchors makes it possible to sanity-check any conversion at a glance. Water freezes at 0 °C / 32 °F and boils at 100 °C / 212 °F. Normal body temperature is about 37 °C / 98.6 °F. A comfortable room is 20–22 °C or 68–72 °F. A hot summer day is 35 °C / 95 °F.
The rough mental conversion — double the Celsius figure and add 30 — is accurate to within a few degrees across normal weather temperatures, and drifts badly outside that range. For oven temperatures, medical readings or anything technical, use the exact formula.