Fahrenheit to Kelvin Converter

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Convert Fahrenheit to Kelvin using the chained formula K = (F − 32) × 5/9 + 273.15. Useful when US weather or oven readings in °F need to feed into a chemistry, physics or HVAC calculation that requires absolute Kelvin input. Anchors: 32 °F = 273.15 K, 100 °F ≈ 310.93 K, 212 °F = 373.15 K. Browser-local conversion.

Fahrenheit (°F)
Kelvin (K)

Fahrenheit (°F) → Kelvin (K)

Quick reference table

Fahrenheit (°F)Kelvin (K)
-40 °F233.15 K
0 °F255.37 K
32 °F273.15 K
50 °F283.15 K
70 °F294.26 K
77 °F298.15 K
98.6 °F310.15 K
100 °F310.93 K
140 °F333.15 K
212 °F373.15 K

Glossary

Fahrenheit (°F)

Fahrenheit is the imperial temperature scale used in everyday life in the United States, where water freezes at 32 °F and boils at 212 °F. Introduced by Daniel Gabriel Fahrenheit in 1724, the scale was originally calibrated against a brine ice mixture and human body temperature. Convert with F = C × 9/5 + 32 or C = (F − 32) × 5/9.

Kelvin (K)

Kelvin is the SI base unit of thermodynamic temperature. The scale starts at absolute zero (0 K = −273.15 °C) — the lowest temperature physically possible, where particle motion stops. One Kelvin step equals one Celsius step, so 0 °C = 273.15 K and 100 °C = 373.15 K. Used in physics, chemistry and engineering wherever absolute temperatures matter.

Metric / SI temperature

In the metric system, temperature is reported in degrees Celsius (everyday) or Kelvin (scientific). The two scales share the same step size — one Kelvin equals one degree Celsius — and differ only by the constant 273.15: T(K) = T(°C) + 273.15. The Kelvin scale starts at absolute zero, while Celsius is anchored to the freezing point of water at standard pressure.

Imperial / US Customary temperature

In the United States, everyday temperature is reported in degrees Fahrenheit, where water freezes at 32 °F and boils at 212 °F. The Rankine scale (absolute, anchored at 0 °R = absolute zero with the Fahrenheit step) is occasionally used in US thermodynamics and aerospace engineering. The conversion between Celsius and Fahrenheit uses the affine formula F = C × 9/5 + 32.

Related tools

Kelvin to Fahrenheit
Convert K to °F — formula F = (K − 273.15) × 9/5 + 32
Fahrenheit to Celsius
Convert °F to °C — formula C = (F − 32) × 5/9
Celsius to Kelvin
Convert °C to K — formula K = C + 273.15
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine