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Fahrenheit to Kelvin Converter

Convert Fahrenheit to Kelvin and Kelvin to Fahrenheit instantly. Bidirectional temperature converter with formula and common values.

°F

Kelvin

310.15

K

98.6 °F = 310.15 K

K = (°F − 32) × 5/9 + 273.15

Fahrenheit to Kelvin: To convert fahrenheit to kelvin, apply K = (°F − 32) × 5/9 + 273.15. Unlike linear unit conversions, fahrenheit and kelvin use different zero points, so a fixed multiplier is not sufficient.

How to Convert Fahrenheit to Kelvin

Converting between fahrenheit and kelvin requires both a scale factor and an offset because the two scales use different zero points. The formula below handles both adjustments.

Conversion Formula

  • Fahrenheit to Kelvin: K = (°F − 32) × 5/9 + 273.15
  • Kelvin to Fahrenheit: °F = (K − 273.15) × 9/5 + 32

Fahrenheit to Kelvin Conversion Chart

Fahrenheit (°F)Kelvin (K)
0.1255.427778
0.25255.511111
0.5255.65
1255.927778
2256.483333
3257.038889
5258.15
10260.927778
20266.483333
25269.261111
50283.15
100310.927778
250394.261111
1000810.927778

Understanding the Units

What is a Fahrenheit?

The degree Fahrenheit is a temperature scale on which water freezes at 32 °F and boils at 212 °F at standard atmospheric pressure.

Named after Daniel Gabriel Fahrenheit (1686–1736), German-Polish physicist who developed the mercury thermometer.

Common contexts: US weather, US cooking.

What is a Kelvin?

The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ J/K.

Named after William Thomson, 1st Baron Kelvin (1824–1907), who proposed an absolute thermodynamic scale in 1848.

Common contexts: physics, astronomy, cryogenics.

Real-World Reference Points

Item Fahrenheit (°F) Kelvin (K)
Water freezing point32273.15
Comfortable room70294.2611
Human body temperature98.6310.15
Water boiling point212373.15

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FAQ

How do I convert Fahrenheit to Kelvin?

Subtract 32, multiply by 5/9, then add 273.15. For example, 75.2°F: (75.2 − 32) × 5/9 + 273.15 = 297.15 K.

What is 0°F in Kelvin?

0°F equals approximately 255.37 Kelvin.

What is absolute zero in Fahrenheit?

Absolute zero (0 K) equals -459.67°F.

How do I convert Kelvin to Fahrenheit?

Subtract 273.15, multiply by 9/5, then add 32. For example, 300 K: (300 − 273.15) × 9/5 + 32 = 80.33°F.

How do you convert fahrenheit to kelvin?

Apply the formula K = (°F − 32) × 5/9 + 273.15. For example, fahrenheit of 0 corresponds to 255.372222 kelvin.

How do you convert kelvin back to fahrenheit?

Use the inverse formula: °F = (K − 273.15) × 9/5 + 32.

Why isn't fahrenheit-to-kelvin a simple multiplication?

Fahrenheit and Kelvin use different zero points, so the relationship includes both a scale factor and an offset. The scale factor alone gives the rate of change but not the absolute value.

What is the difference between Fahrenheit and Kelvin?

The degree Fahrenheit is a temperature scale on which water freezes at 32 °F and boils at 212 °F at standard atmospheric pressure. The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ J/K.