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Kelvin - Fahrenheit Converter

- By Dr. Minas E. Lemonis, PhD - Updated: April 11, 2020

Enter the temperature in either of the next two fields and get it converted instantly!

Kelvins [K]:
Deg. Fahrenheit [°F]:

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Definitions

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Kelvin

Kelvin (symbol K) is the base unit for measuring temperatures according to the SI system of units. By definition, zero Kelvin is mapped to the so called "absolute zero" temperature, the lowest theoretically meaningful temperature in the universe. The freezing temperature of water is mapped to 273.15 K. The Kelvin is equivalent to the Celsius degree (symbol °C), but the two scales are different since the Celsius scale maps 0 to the freezing point of water, whereas the Kelvin scale maps 0 to the absolute zero. When measuring temperature ranges however, both units are equal. It is acceptable to employ both units concurrently, although it is customary in many scientific fields to use K for temperature intervals and °C for absolute temperature measurements.

Multiple and fraction units of temperature ranges in Kelvins can be defined through the decimal SI prefixes, as shown in next table.

UnitSymbol[K]
NanokelvinnK10-9
MicrokelvinμK10-6
MillikelvinmK0.001
KilokelvinkK1000
MegakelvinMK106
GigakelvinGK109

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Fahrenheit degrees

Fahrenheit is a scale for the measurement of absolute temperatures. The Fahrenheit degree (symbol °F) is one step in the scale. The scale was originally defined through key physical temperatures such as human body temperature (≈96°F), freezing of water (32°F) and the stabilized temperature of a solution with equal parts of ice, water and salt (mapped to 0°F, this was probably the coldest material Daniel Gabriel Fahrenheit could produce in his laboratory). Today, the Fahrenheit scale is defined through two characteristic temperatures: freezing of water at 32°F and boiling of water at 212°F. Absolute zero is -459.67 °F.

How to convert Kelvins to degrees Fahrenheit

  • Multiply Kelvins with 9/5 (=1.8)
  • Subtract 459.67
  • The result is the temperature in °F.

For example, to convert 300 K we follow these steps:

300 \times 9/5 = 540

540-459.67 = 8 0.33 °F

How to convert degrees Fahrenheit to Kelvins

  • Add 459.67 to °F
  • Multiply with 5/9
  • The result is the temperature in K.

For example, to convert 65 °F we follow these steps:

65 + 459.67 = 524.67

524.67 \times 5/9 = 291.48 K .

Key temperatures

In the following table some key temperatures are presented, both in [°F] and in [K].

K°F
Absolute zero0-459.67
Water freezing point273.1532
Water boiling point373.15212
Room temperature29368
Human body temperature309.7598

Conversion table from [K] to [°F]

In the following table some typical temperatures in Kelvins are converted to degrees Fahrenheit:

[K][°F]
0-459.7
100-279.7
200-99.67
250-9.67
2608.33
27026.3
273.1532
28044.3
29062.3
30080.3
31098.3
320116
330134
340152
350170
400260
500440
10001340

Conversion table from [°F] to [K]

In the following table some typical temperatures in degrees Fahrenheit are converted to Kelvins:

[°F][K]
-50228
-20244
-10250
0255
10261
20266
30272
40278
50283
60289
70294
80300
90305
100311
120322
150339
200366

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