Convert Fahrenheit to Kelvin
1 °F = 255.928 K · 1 K = -457.87 °F · Exact by definition
1 °F = 255.928 K
The same value in other units
- degree Celsius
- -17.2222 °C
Settings
Digits kept in the answer. Automatic keeps six, which hides floating-point noise without losing anything real.
Convert a whole list
Paste one conversion per line, written the way you would say it: "5 km to mi". Handy for a column copied out of a spreadsheet.
Temperature
Fahrenheit to Kelvin: conversion table
| degree Fahrenheit | kelvin |
|---|---|
| -40 °F | 233.15 K |
| -20 °F | 244.261 K |
| -10 °F | 249.817 K |
| 0 °F | 255.372 K |
| 10 °F | 260.928 K |
| 20 °F | 266.483 K |
| 25 °F | 269.261 K |
| 30 °F | 272.039 K |
| 37 °F | 275.928 K |
| 50 °F | 283.15 K |
| 100 °F | 310.928 K |
| kelvin | degree Fahrenheit |
|---|---|
| -40 K | -531.67 °F |
| -20 K | -495.67 °F |
| -10 K | -477.67 °F |
| 0 K | -459.67 °F |
| 10 K | -441.67 °F |
| 20 K | -423.67 °F |
| 25 K | -414.67 °F |
| 30 K | -405.67 °F |
| 37 K | -393.07 °F |
| 50 K | -369.67 °F |
| 100 K | -279.67 °F |
How the conversion works
K = °F × 0.55555556 + 255.37222
Both units are defined exactly, so the precision of the Fahrenheit to Kelvin result depends only on the number of decimal places you choose.
METHOD AND SOURCES
Where the conversion factors come from
Results are calculated from the unit definitions stored in the converter, not copied from a lookup table. For exact units, every value in the table follows from the same factor shown in the formula above.
- BIPM — SI Brochure
The official definitions of the International System of Units (SI).
- NIST SP 811 — Conversion factors
Conversion-factor tables for SI and non-SI units.
Keep going