By Tim King · Updated 19 September 2026

Kelvin to Fahrenheit and Fahrenheit to Kelvin

Live Two-Way Converter With Formula, Rankine, Colour Temperature and Reference Tables

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kelvins to degrees Fahrenheit formula

°F = K × 1.8 − 459.67

Take the kelvins figure and multiply by 1.8, then subtract 459.67.

kelvins to degrees Fahrenheit table

kelvins (K)	degrees Fahrenheit (°F)
0	-459.67
4.2	-452.11
20	-423.67
50	-369.67
77	-321.07
100	-279.67
150	-189.67
200	-99.67
250	-9.67
273.15	32
280	44.33
290	62.33
293.15	68
298.15	77
300	80.33
310.15	98.6
350	170.33
373.15	212
400	260.33
500	440.33
1,000	1,340.33
2,700	4,400.33
5,778	9,940.73

Common kelvins to degrees Fahrenheit conversions

0 K = -459.67 °F. 0 kelvins is -459.67 degrees Fahrenheit.

273.15 K = 32 °F. 273.15 kelvins is 32 degrees Fahrenheit.

300 K = 80.33 °F. 300 kelvins is 80.33 degrees Fahrenheit.

310.15 K = 98.6 °F. 310.15 kelvins is 98.6 degrees Fahrenheit.

373.15 K = 212 °F. 373.15 kelvins is 212 degrees Fahrenheit.

degrees Fahrenheit to kelvins formula

K = (°F + 459.67) ÷ 1.8

Take the degrees Fahrenheit figure and add -459.67, then divide by 1.8.

degrees Fahrenheit to kelvins table

degrees Fahrenheit (°F)	kelvins (K)
-459.67	0
-400	33.15
-320	77.5944
-300	88.7056
-200	144.261
-100	199.817
-40	233.15
0	255.372
32	273.15
50	283.15
68	293.15
70	294.261
77	298.15
98.6	310.15
100	310.928
150	338.706
200	366.483
212	373.15
250	394.261
300	422.039
350	449.817
400	477.594
500	533.15
750	672.039
1,000	810.928

Common degrees Fahrenheit to kelvins conversions

0 °F = 255.372 K. 0 degrees Fahrenheit is 255.372 kelvins.

32 °F = 273.15 K. 32 degrees Fahrenheit is 273.15 kelvins.

70 °F = 294.261 K. 70 degrees Fahrenheit is 294.261 kelvins.

98.6 °F = 310.15 K. 98.6 degrees Fahrenheit is 310.15 kelvins.

212 °F = 373.15 K. 212 degrees Fahrenheit is 373.15 kelvins.

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How the Kelvin To Fahrenheit works

This kelvin to Fahrenheit converter shows the exact working. Type a temperature in kelvin and get degrees Fahrenheit as you type. A kelvin is 1.8 Fahrenheit degrees and the Kelvin scale starts at absolute zero, which is −459.67 °F, so multiply by 1.8 and subtract 459.67. The table runs from absolute zero through laboratory and room temperatures to the surface of the sun. Press the swap button to go the other way.

Kelvin to Fahrenheit: multiply, then subtract

Kelvin degrees are the same size as Celsius degrees, and each is 1.8 Fahrenheit degrees. Multiplying by 1.8 converts the kelvin count into Fahrenheit-sized degrees above absolute zero — the Rankine scale — and subtracting 459.67 moves the zero to Fahrenheit's. 273.15 K × 1.8 = 491.67; minus 459.67 = 32 °F, the freezing point of water. Going through Celsius instead — subtract 273.15, multiply by 1.8, add 32 — gives the same result.

Worked example: 300 K

300 × 1.8 = 540; minus 459.67 = 80.33 °F. Physics problems use 300 K as a round-number room temperature; it is warmer than most rooms, which sit around 293 to 295 K (68 to 72 °F). The chemistry standard of 298.15 K is exactly 25 °C and 77 °F.

Worked example: 77 K liquid nitrogen

77 × 1.8 = 138.6; minus 459.67 = −321.07 °F. Liquid nitrogen boils at 77.36 K, which is −320.4 °F. Liquid helium at 4.2 K is −452.1 °F, only seven Fahrenheit degrees above absolute zero. Kelvin figures this small are easier to read than the Fahrenheit ones because they say directly how far above zero the temperature is.

Colour temperature

A bulb labelled 2,700 K would, if it were a glowing black body, be at 4,400 °F. A 5,600 K daylight bulb corresponds to 9,620 °F, and the sun's surface at 5,778 K is 9,941 °F. These are colours, not operating temperatures — the bulb itself runs at a few hundred degrees Fahrenheit at most.

Rankine

American thermodynamics tables use degrees Rankine, an absolute scale with Fahrenheit-sized degrees: °R = K × 1.8, and °F = °R − 459.67. If you are converting for a Rankine-based formula, stop after the multiplication: 300 K is 540 °R.

Temperature differences

A difference of 10 K is a difference of 18 °F. Multiply by 1.8 only; the 459.67 offset cancels in any subtraction. Heat capacities, conductivities and thermal expansion coefficients per kelvin become per-degree-Fahrenheit by dividing by 1.8 — no offset.

Worked example: 70 °F room temperature

70 + 459.67 = 529.67; ÷ 1.8 = 294.26 K. Physics and chemistry work is done in kelvin because gas laws and radiation formulas need an absolute scale: the volume of a gas at 70 °F is 294.26/273.15 times its volume at freezing, and you cannot get that ratio from the Fahrenheit figures. A "room temperature" of 300 K, common in problem sets, is 80.33 °F.

Worked example: −320 °F liquid nitrogen

−320 + 459.67 = 139.67; ÷ 1.8 = 77.59 K. Liquid nitrogen boils at 77.36 K, which is −320.4 °F; the American figure of −320 °F is a rounding. At cryogenic temperatures the kelvin figure is the useful one because it says directly how far above absolute zero the substance is: 77 K is 77 degrees above nothing.

Kelvin to Fahrenheit formula and table

The formula on this page is °F = K × 1.8 − 459.67, applied exactly before rounding for display.

How many degrees Fahrenheit in 0 kelvins? 0 K is -459.67 °F. Likewise 273.15 K is 32 °F, 300 K is 80.33 °F, 310.15 K is 98.6 °F.

Kelvin to Fahrenheit conversion table

Kelvins (K)	Degrees Fahrenheit (°F)
0	-459.67
4.2	-452.11
20	-423.67
50	-369.67
77	-321.07
100	-279.67
150	-189.67
200	-99.67
250	-9.67
273.15	32
280	44.33
290	62.33
293.15	68
298.15	77
300	80.33
310.15	98.6
350	170.33
373.15	212
400	260.33
500	440.33
1,000	1,340
2,700	4,400
5,778	9,941

FAQ

What is the formula for kelvin to Fahrenheit?

°F = K × 1.8 − 459.67, which is the same as (K − 273.15) × 1.8 + 32. Multiply the kelvin figure by 1.8 and subtract 459.67. 373.15 K is 671.67 − 459.67 = 212 °F.

What is 0 K in Fahrenheit?

−459.67 °F, absolute zero. It is the lowest temperature possible, equal to −273.15 °C. Nothing can be cooled to it, though laboratory experiments have reached within billionths of a kelvin.

What is 300 K in Fahrenheit?

300 K is 80.33 °F, or 26.85 °C. 293.15 K is 68 °F, 298.15 K is 77 °F, and 310.15 K — normal body temperature — is 98.6 °F.

Is a kelvin bigger than a degree Fahrenheit?

Yes: one kelvin is 1.8 Fahrenheit degrees, the same size as a Celsius degree. There are 180 Fahrenheit degrees between freezing and boiling water and 100 kelvins, so each kelvin is 180/100 = 1.8 °F.

What is the formula for Fahrenheit to kelvin?

K = (°F + 459.67) ÷ 1.8, which is the same as (°F − 32) ÷ 1.8 + 273.15. Add 459.67 to the Fahrenheit figure and divide by 1.8. 212 °F is 671.67 ÷ 1.8 = 373.15 K.