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Free fahrenheit to kelvin converter with instant bidirectional conversion. Enter F to get K, or enter K to get F. Includes Celsius output and practical temperature references.
Last updated: April 16, 2026
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Temperature Formulas
Kelvin = (Fahrenheit - 32) x 5/9 + 273.15 and Fahrenheit = (Kelvin - 273.15) x 9/5 + 32
Fahrenheit to Kelvin
68 F = 293.15 K
Formula: (68 - 32) x 5/9 + 273.15 = 293.1500 K
Celsius
20 C
Rounded Kelvin
293 K
Common reference points
Formula
(F - 32) x 5/9 + 273.15
Exact conversion from the Fahrenheit scale to absolute temperature.
Formula
(K - 273.15) x 9/5 + 32
Fast reverse conversion for scientific values in kelvin.
Kelvin Limit
K >= 0
Prevents physically invalid negative kelvin input.
32 F = 273.15 K
Water freezes at this temperature.
212 F = 373.15 K
Water boils at this temperature.
Fahrenheit and kelvin are both linear temperature scales with different zero points and increments. Kelvin is an absolute thermodynamic scale where 0 K is absolute zero.
Kelvin = (Fahrenheit - 32) x 5/9 + 273.15Fahrenheit = (Kelvin - 273.15) x 9/5 + 32These equations provide exact conversions between Fahrenheit and Kelvin.
Absolute zero is 0 K, equivalent to -459.67 F. Values below 0 K are not physically possible, so this calculator rejects negative kelvin input.
Result: 77 F equals 298.15 K
Equivalent temperature is 25 C.
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