Convert 4 Fahrenheit (°F) to Kelvin (K).

4 Fahrenheit equals 257.594444 Kelvin. Apply the formula K = (°F - 32) × 5/9 + 273.15.

4 Fahrenheit = 257.594444 Kelvin

Worked example: converting Fahrenheit to Kelvin

Step 1 — start with the formula. K = (°F - 32) × 5/9 + 273.15
Step 2 — substitute your figure. Apply the formula to 4 °F.
Step 3 — read the result. 4 °F = 257.594444 K
Step 4 — check it in reverse. °F = (K - 273.15) × 9/5 + 32 returns 4 °F, which matches the figure you started with.

Temperature Converter

5 units available

Decimals:

From

To

257.594444

4 °F = 257.594444 K

Formula:

K = (°F - 32) × 5/9 + 273.15

With your value: 4 °F = 257.59444444 K

Other Fahrenheit to Kelvin conversions

1 °F to K 2 °F to K 3 °F to K 5 °F to K 6 °F to K 7 °F to K 8 °F to K Full Fahrenheit to Kelvin converter

Fahrenheit to Kelvin Conversion Table

Fahrenheit (°F)	Kelvin (K)
0.5	255.65
1	255.927778
2	256.483333
5	258.15
10	260.927778
15	263.705556
20	266.483333
25	269.261111
50	283.15
100	310.927778
250	394.261111
500	533.15
1000	810.927778

Kelvin to Fahrenheit Conversion Table

Kelvin (K)	Fahrenheit (°F)
0.5	-458.77
1	-457.87
2	-456.07
5	-450.67
10	-441.67
15	-432.67
20	-423.67
25	-414.67
50	-369.67
100	-279.67
250	-9.67
500	440.33
1000	1,340.33

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Fahrenheit (°F)

Temperature

Exact conversion

°F = °C × 9/5 + 32 exactly; the conversion is affine, not a single multiplying factor.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Kelvin (K)

Temperature

SI definition

Traceable to the kelvin, defined by fixing the Boltzmann constant at 1.380 649 × 10⁻²³ J/K. Celsius and Fahrenheit are exact affine transforms of the kelvin scale.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Standards and context behind Fahrenheit to Kelvin

Rankine scale: The absolute scale that pairs with Fahrenheit degrees; 0 °F = 459.67 °R.

How to Convert Fahrenheit to Kelvin

This conversion uses an offset formula, so it cannot be described by a single multiplication factor.

Formula: K = (°F - 32) × 5/9 + 273.15

Reverse: °F = (K - 273.15) × 9/5 + 32

Step-by-Step Example

Start with your value in Fahrenheit. For example: 5 °F
Apply K = (°F - 32) × 5/9 + 273.15
The result is: 258.15 K

About Fahrenheit

The Fahrenheit scale sets 32°F as the freezing point and 212°F as the boiling point of water. It is primarily used in the United States.

Fun Fact: Daniel Fahrenheit chose 96°F as his upper reference point, based on human body temperature (which he measured slightly inaccurately).

Common uses: weather (US), cooking (US), HVAC.

About Kelvin

The Kelvin scale is the SI unit of temperature that starts at absolute zero (−273.15°C). It is used extensively in scientific research.

Fun Fact: At 0 Kelvin (absolute zero), all molecular motion stops. It has never been fully achieved in a laboratory.

Common uses: physics, astronomy, chemistry.

Frequently Asked Questions

What is 4 Fahrenheit in Kelvin?

4 Fahrenheit equals 257.594444 Kelvin.

How many Kelvin are in 1 Fahrenheit?

There are exactly 255.9277777778 Kelvin in 1 Fahrenheit.

What is the formula to convert Fahrenheit to Kelvin?

The formula to convert Fahrenheit to Kelvin is: K = (°F - 32) × 5/9 + 273.15. For example, to convert 10 Fahrenheit to Kelvin, you would apply the formula to 10.

What is a Fahrenheit?