Fahrenheit to Kelvin Converter
Temperature · unit-converter
Convert Fahrenheit to Kelvin with offset-aware formulas (not simple ratio scaling), step-by-step lines, and reference tables. Uses 273.15 for Celsius–Kelvin offsets, R = (9/5) × K for kelvin–rankine, and °F–R offset 459.67.
About Fahrenheit
Fahrenheit is common in the United States for weather and cooking. Water freezes at 32 °F and boils at 212 °F at standard pressure. Convert via Celsius or direct offset formulas.
About Kelvin
Kelvin is the SI base unit for thermodynamic temperature. 0 K is absolute zero. The triple point of water is 273.16 K by definition; this tool uses 273.15 for °C ↔ K in everyday conversions.
How to convert Fahrenheit to Kelvin
From Fahrenheit to Kelvin: first convert to Celsius with (°F − 32) × 5/9, then add 273.15.
Convert through Celsius: (°F − 32) × 5/9 gives °C, then add 273.15 for kelvin.
Unlike units with a single fixed ratio (meters to feet), absolute temperatures include an offset. Always use the full formula for this pair—do not “multiply only” by a scale factor unless you are computing a temperature difference (interval), where offsets cancel.
Examples
Example #1: Convert 32 f to Kelvin
0.000000°C + 273.15 = 273.150000K
→ 273.15 k
Example #2: Convert 68 f to Kelvin
20.000000°C + 273.15 = 293.150000K
→ 293.15 k
Summary
From Fahrenheit to Kelvin: first convert to Celsius with (°F − 32) × 5/9, then add 273.15.
Relationship context
Converting Fahrenheit to Kelvin uses different zeros and step sizes. You cannot multiply by a single ratio alone for every pair—you first express the same physical temperature in an intermediate form (Celsius is used inside this tool), then map to Kelvin. Unlike length or energy units, offsets matter for Celsius and Fahrenheit; kelvin and rankine are absolute scales linked by the exact factor 9/5.
Conversion tables
| Fahrenheit (f) | Kelvin (k) |
|---|---|
| -40 | 233.15 |
| 0 | 255.372222222 |
| 32 | 273.15 |
| 68 | 293.15 |
| Fahrenheit (f) | Kelvin (k) |
|---|---|
| 86 | 303.15 |
| 100 | 310.927777778 |
| 212 | 373.15 |