# How to convert a temperature to Kelvin

Formulas for converting a unit of temperature to Kelvin.

## Formula to convert Celsius to Kelvin

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

T(K) = T(°C) + 273.15

How many kelvins (K) correspond to 75 degrees Celsius (°C)?

Replace T(°C) in the °C to K formula for 75 and add 273.15.

T(K) = 75 + 273.15

T(K) = 348.15 or

75 °C = 176 K

75 degrees Celsius correspond to 176 kelvins.

## Formula to convert Fahrenheit to Kelvin

Formula to convert from degrees Fahrenheit (°F) to kelvin (K) is:

T(K) = [T(°F) + 459.67] × 5/9

How many kelvins (K) correspond to 25 degrees Fahrenheit (°F)?

Replace T(°F) in the °F to K formula for 25, add 459.67, multiply by 5, then divide by 9.

T(K) = [25 + 459.67] × 5/9

T(K) = 269.26 or

25 °F = 269.26 K

25 degrees Fahrenheit correspond to 269.26 kelvins.

## Formula to convert Rankine to Kelvin

Formula to convert from degrees Rankine (°R) to kelvin (K) is:

T(K) = T(°R) × 5/9

How many kelvins (K) correspond to 36 degrees Rankine (°R)?

Replace T(°R) in the °R to K formula for 36, multiply by 5, then divide by 9.

T(K) = 36 × 5/9

T(K) = 20 or

36 °R = 20 K

36 degrees Rankine correspond to 20 kelvins.

## Formula to convert Réaumur to Kelvin

Formula to convert from degrees Réaumur (°Ré) to kelvin (K) is:

T(K) = T(°Ré) × 5/4 + 273.15

How many kelvins (K) correspond to 36 degrees Réaumur (°Ré)?

Replace T(°Ré) in the °Ré to K formula for 36, multiply by 5, divide by 4, then add 273.15.

T(K) = 36 × 5/4 + 273.15

T(K) = 318.15 or

36 °Ré = 318.15 K

36 degrees Réaumur correspond to 318.15 kelvins.