## Celsius and Fahrenheit Conversion Formulas

## Celsius to Fahrenheit conversion formula:

## Celsius (Centigrade)to

Fahrenheit | [°F] = [°C] × ^{9}⁄_{5} + 32 |
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Kelvin | [K] = [°C] + 273.15 |

Rankine | [°R] = ([°C] + 273.15) × ^{9}⁄_{5} |

Delisle | [°De] = (100 − [°C]) × ^{3}⁄_{2} |

Newton | [°N] = [°C] × ^{33}⁄_{100} |

Réaumur | [°Ré] = [°C] × ^{4}⁄_{5} |

Rømer | [°Rø] = [°C] × ^{21}⁄_{40} + 7.5 |

The next simple approximation works well within the range of normal weather temperatures [°F] = [°C] × 2 + 30 (or [°C] = ([°F] − 30) / 2) , underestimating by 6°F at −20°C and over by 4°F at 30°C.

## Fahrenheit to Celsius conversion formula:

## Fahrenheit to

Celsius | [°C] = ([°F] − 32) × ^{5}⁄_{9} |
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Kelvin | [K] = ([°F] + 459.67) × ^{5}⁄_{9} |

Rankine | [°R] = [°F] + 459.67 |

Delisle | [°De] = (212 − [°F]) × ^{5}⁄_{6} |

Newton | [°N] = ([°F] − 32) × ^{11}⁄_{60} |

Réaumur | [°Ré] = ([°F] − 32) × ^{4}⁄_{9} |

Rømer | [°Rø] = ([°F] − 32) × ^{7}⁄_{24} + 7.5 |