Convert Fahrenheit to Kelvin

Convert Fahrenheit to Kelvin in seconds with a clear, exact temperature result. Enter a Fahrenheit value to get Kelvin right away for science work, lab reports, and unit checks.

Fahrenheit

Kelvin to Fahrenheit

How many fahrenheit in a kelvin?

In 1 fahrenheit there are 255.927778 kelvin. Meanwhile in 1 kelvin there are -457.87 fahrenheit. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Kelvin to Fahrenheit calculator above to convert any number.

* Values rounded to 6 decimal places for readability

How to convert fahrenheit to kelvin?

To convert Fahrenheit to Kelvin, use a simple two-step formula based on absolute temperature.

Start with the Fahrenheit (°F) value.
Convert to Kelvin (K) with this formula:

K = (°F − 32) × 5/9 + 273.15

Key points to remember:

Kelvin (K) has no degree symbol.
273.15 K is the same as 0°C.
0 K is absolute zero, the lowest possible temperature.

Example:

68°F to K: (68 − 32) × 5/9 + 273.15 = 293.15 K

Frequently asked questions

What is the Fahrenheit to Kelvin formula?

To convert Fahrenheit to Kelvin, use this formula:
K = (°F − 32) × 5/9 + 273.15
Kelvin uses no degree symbol. Write it as K, not °K.

How do you convert Fahrenheit to Kelvin step by step?

Start with the temperature in Fahrenheit (°F).
Subtract 32.
Multiply the result by 5/9.
Add 273.15 to get Kelvin (K).

What is 32°F in Kelvin?

32°F = 273.15 K
32°F is the freezing point of water, which matches 273.15 K.

What is 0°F in Kelvin?

0°F = 255.372 K
Using the formula: (0 − 32) × 5/9 + 273.15 = 255.372.

What is 100°F in Kelvin?

100°F = 310.928 K
Using the formula: (100 − 32) × 5/9 + 273.15 = 310.928.

Why does Fahrenheit to Kelvin add 273.15?

Kelvin starts at absolute zero, the lowest possible temperature.
Celsius sets water freezing at 0°C, which equals 273.15 K.
After converting Fahrenheit to Celsius, you add 273.15 to shift to Kelvin.

What is absolute zero in Fahrenheit and Kelvin?

Absolute zero is:

0 K
−459.67°F (rounded to two decimals)

Can Kelvin temperatures be negative?

No. Kelvin can’t go below 0 K.
A negative Kelvin value means the conversion or input is wrong.

Do you round Kelvin values when converting from Fahrenheit?

Rounding depends on your use.

For everyday use, 2 decimal places is common.
For science and lab work, keep more digits to reduce error.

What is the reverse formula, Kelvin to Fahrenheit?

To convert Kelvin to Fahrenheit, use:
°F = (K − 273.15) × 9/5 + 32
This reverses the same steps in the opposite direction.

What’s the difference between Fahrenheit, Celsius, and Kelvin?

Fahrenheit (°F): Common in the United States for weather and daily use.
Celsius (°C): Used in most countries and in many fields.
Kelvin (K): Used in science; it starts at absolute zero.

What are common mistakes when converting Fahrenheit to Kelvin?

Common errors include:

Forgetting to subtract 32 first.
Multiplying by 9/5 instead of 5/9.
Adding 273.15 before converting to Celsius.
Writing Kelvin with a degree sign (it should be K, not °K).

How does this converter work?

The Calculate Box tool to convert fahrenheit to kelvin uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a fahrenheit value in the box and have it instantly converted to kelvin.