# How to convert a temperature to Celsius

Formulas to convert a unit of temperature to degrees Celsius.

## Formula to convert Fahrenheit to Celsius

Formula to convert from degrees Fahrenheit (°F) to degrees Celsius (°C) is:

T(°C) = [T(°F) - 32] × 5/9

How many degrees Celsius (°C) correspond to 100 degrees Fahrenheit (°F)?

Replace T(°F) in the °F to °C formula for 100, subtract 32, multiply by 5, then divide by 9.

T(°C) = [100 - 32] × 5/9

T(°C) = 37.8 or

100 °F = 37.8 °C

100 degrees Fahrenheit correspond to 37.8 degrees Celsius (or centigrade).

## Formula to convert Kelvin to Celsius

Formula to convert from kelvins (K) to degrees Celsius (°C) is:

T(°C) = T(K) - 273.15

How to convert 120 kelvins (K) to degrees Celsius (°C)?

Replace T(K) in the K to °C formula for 120, then subtract 273.15.

T(°C) = 120 - 273.15

T(°C) = -153.15 or

120 K = -153.15 °C

120 kelvins correspond to -153.15 degrees Celsius (or centigrade).

## Formula to convert Rankine to Celsius

Formula to convert from degrees Rankine (°R) to degrees Celsius (°C) is:

T(°C) = [T(°R) - 491.67] × 5/9

How to convert 250 degrees Rankine (°R) to degrees Celsius (°C)?

Replace T(°R) in the °R to °C formula for 250, subtract 491.67, multiply by 5, and then divide by 9.

T(°C) = [250 - 491.67] × 5/9

T(°C) = -134.26 or

250 °R = -134.26 °C

250 degrees Rankine correspond to -134.26 degrees Celsius (or centigrade).

## Formula to convert Réaumur to Celsius

Formula to convert from degrees Réaumur (°Ré) to degrees Celsius (°C) is:

T(°C) = T(°Ré) × 5/4

How to convert 250 degrees Réaumur (°Ré) to degrees Celsius (°C)?

Replace T(°Ré) in the °Ré to °C formula for 250, multiply by 5, and then divide by 4.

T(°C) = 250 × 5/4

T(°C) = 312.5 or

250 °Ré = 312.5 °C

250 degrees Réaumur equals 312.5 degrees Celsius (or centigrade).