# Kelvins to degrees Fahrenheit converter

> Convert kelvins to degrees Fahrenheit (Kelvin to Fahrenheit) with the exact formula, a conversion chart and worked steps.

Interactive version: https://www.calcopenly.com/conversion/kelvin-to-fahrenheit
Subject: Unit converters

Kelvin is an absolute temperature scale used in physical equations. Its zero is absolute zero, and the unit is written K without a degree symbol. Restating a laboratory temperature on an everyday scale changes the numerical zero point without changing the physical temperature.

Kelvins and degrees Fahrenheit are not related by a single multiplier because the two scales start from different zero points, so the conversion uses a formula. 300 K is 80.33 °F.

The Celsius and kelvin scales have the same step size; a Fahrenheit degree is 5/9 of a Celsius degree. Absolute zero is 0 K, −273.15 °C or −459.67 °F, and inputs below it are rejected.

## Inputs

- **Kelvins (K)**

## Results

- Degrees Fahrenheit (°F) — main result
- Conversion
- 1 °F in kelvins (K)

## Formula

$$
{}^\circ F = K \times \tfrac{9}{5} - 459.67
$$

## Worked examples

### 300 K to °F

- Kelvins (K): 300 K
- **Degrees Fahrenheit: 80.33 °F**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 255.372 K to °F

- Kelvins (K): 255.372 K
- **Degrees Fahrenheit: -0.0004 °F**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 0 K to °F

- Kelvins (K): 0 K
- **Degrees Fahrenheit: -459.67 °F**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert Kelvin to Fahrenheit?

Kelvin is an absolute temperature scale used in physical equations. Its zero is absolute zero, and the unit is written K without a degree symbol. Restating a laboratory temperature on an everyday scale changes the numerical zero point without changing the physical temperature.

### What is the formula to convert Kelvin to Fahrenheit?

Multiply by 9/5 and subtract 459.67: 300 K × 1.8 − 459.67 = 80.33 °F.

### How accurate is the kelvins to degrees Fahrenheit converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “300 K to °F” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

### Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

## Sources

- [NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C: General tables of units of measurement](https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-44)
- [BIPM, The International System of Units (SI Brochure), 9th edition](https://www.bipm.org/en/publications/si-brochure)