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Temperature converter: Celsius, Fahrenheit, Kelvin and Rankine

Convert a temperature between Celsius, Fahrenheit, Kelvin and Rankine. Type the value, pick the source and target units, and the result appears instantly.

Processed on your device. Nothing is sent to any server.

Fahrenheit (°F)

77 °F

Converts the value to kelvin as an intermediate unit and then to the target unit, using the exact formulas:

  • K = °C + 273.15
  • °F = °C × 9/5 + 32
  • °R = K × 9/5

Use cases

  • Following a recipe or oven setting given in Fahrenheit.
  • Converting lab or physics data to kelvin.
  • Reading a foreign weather forecast.

How it works

  1. 1

    Type the temperature

    Negative values and decimals are accepted, with a dot or a comma.

  2. 2

    Pick the units

    Choose the source and target units; the result updates when either changes.

Technical details

  • Examples: 100 °C = 212 °F = 373.15 K; 0 °C = 32 °F; −40 °C = −40 °F (the only point where both scales meet).
  • Kelvin is written without a degree sign ("K", not "°K"). Rankine is the absolute scale with Fahrenheit-sized degrees.
  • Below absolute zero (0 K, −273.15 °C or −459.67 °F) no temperature is possible: the converter shows "-" and says so.
  • Result rounded to 2 decimal places.

Frequently asked questions

Are centigrade and Celsius the same?

Yes. "Centigrade" is the older name for the Celsius scale; the values are identical.

Why can't kelvin be negative?

Because 0 K is absolute zero, the theoretical minimum temperature. Celsius and Fahrenheit do have negative values because their zero sits elsewhere (water's freezing point and a brine mixture, respectively).

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