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Kelvins to degrees Fahrenheit converter

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

Updated Checked against 3 worked examples

K
Try
Degrees Fahrenheit
°F
Degrees Fahrenheit: 80.33 °F
Shown to 12 significant figures, half-up
Conversion
300 K = 80.33 °F

300 kelvins is 80.33 degrees Fahrenheit.

Kelvins to degrees Fahrenheit

-400-20002000100200300K°F300 → 80.33
Kelvin to Fahrenheit chart (5 rows)
KelvinsDegrees Fahrenheit
0−459.67
255.372−0.0004
273.1532
30080.33
373.15212
How it's calculated S
  1. Apply the formula

    ∘F=K×95−459.67⇒300 K=80.33 °F{}^\circ F = K \times \tfrac{9}{5} - 459.67\quad\Rightarrow\quad 300\ \text{K} = 80.33\ \text{°F}

About the kelvins to degrees Fahrenheit converter

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.

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.

About this calculator

∘F=K×95−459.67{}^\circ F = K \times \tfrac{9}{5} - 459.67

Sources

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

Checked against references

3 worked examples with independently sourced answers ship with this calculator. They run in the test suite; you can run them here too.

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