Temperature Conversion Calculator

Temperature Conversion Calculator and formulas

Temperature Conversion


This calculator can be used to convert temperature measurements. Select the unit of measurement that you know and enter its value. Then click on 'Calculate'.

The number of decimal places representation can be set.


Temperature calculator

 Enter the unit of measure and the temperature
Decimal places
  Results
Celsius   °C
Fahrenheit   °F
Kelvin   K
Delisle   °De
Newton   °N
Rankine   °Ra
Réaumur   °Ré
Rømer   °Rø

Scales with SI units

The unit of thermodynamic temperature is the Kelvin with the symbol K. The Kelvin is a basic SI unit. It is the 273.16th part of the thermodynamic temperature of the triple point of water, in which its solid, liquid and gaseous phase coexist. The zero point of the Kelvin scale at absolute zero is −273.15 ° C.

According to its modern definition, the Celsius temperature no longer indicates the empirical temperature of the historical Celsius scale, but is the thermodynamic temperature on the Kelvin scale with a numerical value that is 273.15 lower: The unit degree Celsius (° C) is a derived SI unit. The degree Celsius scale is identical to the Kelvin. Temperature differences are given in K; the difference between two Celsius temperatures can also be given in ° C. The numerical value is the same in both cases.


Scales without SI unit

In the USA, the Fahrenheit scale with the unit degree Fahrenheit (unit symbol: ° F) is still in use. The absolute temperature based on Fahrenheit is denoted by degrees Rankine (unit symbol: ° Ra). The Rankine scale has the zero point like the Kelvin scale at absolute temperature zero, in contrast to this, however, the scale intervals of the Fahrenheit scale.

Formulas for converting temperature units

Convert from Kelvin to

Celsius \(T_K − 273,15\)
Réaumur \((T_K − 273,15) · 0,8\)
Fahrenheit \(T_K · 1,8 − 459,67\)
Rankine \(T_K · 1,8\)
Rømer \((T_K − 273,15) · 21⁄40 + 7,5\)
Delisle \((373,15 − T_K) · 1,5\)
Newton \((T_K − 273,15) · 0,33\)

Convert from Celsius to

Kelvin \(T_C + 273,15\)
Réaumur \((T_C · 0,8) · 0,8\)
Fahrenheit \(T_C · 1,8 + 32\)
Rankine \(T_C · 1,8 + 491,67\)
Rømer \(T_C · 21⁄40 + 7,5\)
Delisle \((100 − T_C) · 1,5\)
Newton \(T_C · 0,33\)

Convert from Rankine to

Kelvin \(T_{Ra} · 5⁄9\)
Celsius \(T_{Ra} · 5⁄9 − 273,15\)
Réaumur \(T_{Ra} · 4⁄9 − 218,52\)
Fahrenheit \(T_{Ra} − 459,67\)
Rømer \((T_{Ra} − 491,67) · 7⁄24 + 7,5\)
Delisle \((671,67 − T_{Ra}) · 5⁄6\)
Newton \((T_{Ra} − 491,67) · 11⁄60\)

Convert from Rømer to

Kelvin \((T_{Rø} − 7,5) · 40⁄21 + 273,15\)
Celsius \((T_{Rø} − 7,5) · 40⁄21\)
Réaumur \((T_{Rø} − 7,5) · 32⁄21\)
Fahrenheit \((T_{Rø} − 7,5) · 24⁄7 + 32\)
Rankine \((T_{Rø} − 7,5) · 24⁄7 + 491,67\)
Delisle \((60 − T_{Rø}) · 20⁄7\)
Newton \((T_{Rø} − 7,5) · 22⁄35\)


Convert from Fahrenheit to

Kelvin \((T_F + 459,67) · 5⁄9\)
Celsius \((T_F − 32) · 5⁄9\)
Réaumur \((T_F − 32) · 4⁄9\)
Rankine \(T_F + 459,67\)
Rømer \((T_F − 32) · 7⁄24 + 7,5\)
Delisle \((212 − T_F) · 5⁄6\)
Newton ((T_F − 32) · 11⁄60\)

Convert from Réaumur to

Kelvin \(T_{Ré} · 1,25 + 273,15\)
Celsius \(T_{Ré} · 1,25\)
Fahrenheit \(T_{Ré} · 2,25 + 32\)
Rankine \(T_{Ré} · 2,25 + 491,67\)
Rømer \(T_{Ré} · 21⁄32 + 7,5\)
Delisle \((80 − T_{Ré}) · 1,875\)
Newton \(T_{Ré} · 33⁄80\)

Convert from Delisle to

Kelvin \(373,15 − T_{De} · 2⁄3\)
Celsius \(100 − T_{De} · 2⁄3\)
Réaumur \(80 − T_{De} · 8⁄15\)
Fahrenheit \(212 − T_{De} · 1,2\)
Rankine \(671,67 − T_{De} · 1,2\)
Rømer \(60 − T_{De} · 0,35\)
Newton \(33 − T_{De} · 0,22\)

Convert from Newton to

Kelvin \(T_N · 100⁄33 + 273,15\)
Celsius \(T_N · 100⁄33\)
Réaumur \(T_N · 80⁄33\)
Fahrenheit \(T_N · 60⁄11 + 32\)
Rankine \(T_N · 60⁄11 + 491,67\)
Rømer \(T_N · 35⁄22 + 7,5\)
Delisle \((33 − T_N) · 50⁄11\)
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