What is being measured?
Temperature readings depend on a scale and its zero point. Absolute temperature and a temperature difference require different treatment of offsets.
Temperature scales use offsets and scaling. Absolute temperature cannot be below zero kelvin.
Meaning of °F
Fahrenheit uses the symbol °F in this library and measures temperature. Under the stated reference convention, a temperature reading of 1 °F = approximately 255.927777778 K. This compares readings on the two scales. A temperature difference uses only the scale factor, without the zero-point offset. It does not increase measurement accuracy or establish whether a measurement is appropriate to a real application.
Conversion method
These scales have an offset as well as a scale factor. Convert through the shared reference scale and apply both parts; comparing temperature readings differs from comparing temperature differences.
Worked example
For a known value of 10 °F, the reference conversion gives 260.927777778 K. Converting that result back gives approximately 10 °F. This reverse check helps catch a reversed factor, but matching round-trip arithmetic alone does not independently verify a source definition.
Common reference values
| Input (°F) | Reference equivalent (K) |
|---|---|
| 1 | 255.927777778 |
| 5 | 258.15 |
| 10 | 260.927777778 |
| 25 | 269.261111111 |
| 50 | 283.15 |
| 100 | 310.927777778 |
Compare one °F with other units
| Target unit | Equivalent of 1 °F | Definition guide |
|---|---|---|
| Kelvin (K) | 255.927777778 | Read definition |
| Celsius (°C) | -17.2222222222 | Read definition |
| Rankine (°R) | 460.67 | Read definition |
Precision and common mistakes
- Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
- Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
- Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
- Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.
Use a working converter
- Temperature converter
- Fahrenheit to Rankine converter
- Fahrenheit to Kelvin converter
- Fahrenheit to Celsius converter
Source and verification scope
Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.
Sources
- NIST / BIPM: NIST: unit conversion factors ↗ · 2026-10-08