Fahrenheit to Kelvin Converter
Fahrenheit (°F) → Kelvin (K)
Also: 25 °C Celsius · 536.67 °R Rankine
Show Your Work
- 1. Step 1 — Fahrenheit to Celsius: C = (77 − 32) × 5/9 = 25°C
- 2. Step 2 — Celsius to Kelvin: K = 25 + 273.15 = 298.15 K
About this conversion
Fahrenheit to Kelvin is a two-step conversion: shift to Celsius first (subtract 32, scale by 5/9), then add 273.15 for the absolute scale. Common when a U.S.-sourced temperature reading needs to feed into a scientific equation that requires Kelvin.
Fahrenheit to Kelvin Reference Table
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| -459.67 | 0 |
| -200 | 144.26111 |
| -100 | 199.81667 |
| -40 | 233.15 |
| 0 | 255.37222 |
| 32 | 273.15 |
| 50 | 283.15 |
| 70 | 294.26111 |
| 77 | 298.15 |
| 98.6 | 310.15 |
| 100 | 310.92778 |
| 150 | 338.70556 |
| 200 | 366.48333 |
| 212 | 373.15 |
| 300 | 422.03889 |
| 400 | 477.59444 |
| 500 | 533.15 |
| 750 | 672.03889 |
| 1000 | 810.92778 |
| 1500 | 1088.7056 |
| 2000 | 1366.4833 |
When to use Fahrenheit → Kelvin
- Plugging a U.S. weather or HVAC reading into the ideal gas law (PV = nRT)
- Converting Fahrenheit-quoted environmental data for spectroscopy or rate calculations
- Cross-checking thermodynamic engineering results against a metric scientific source
Worked Example
A room is 77°F. What is that in Kelvin?
- Start with the Fahrenheit value: F = 77.
- Subtract 32: 77 − 32 = 45.
- Multiply by 5/9: 45 × 5/9 = 25.
- Add 273.15: 25 + 273.15 = 298.15.
- So 77°F = 298.15 K.
298.15 K (25°C / 77°F) is the IUPAC standard ambient temperature, so this conversion lands on a value that shows up frequently in thermodynamic tables.
Frequently Asked Questions
What is the formula to convert Fahrenheit to Kelvin?
K = (F − 32) × 5/9 + 273.15. Subtract 32, scale by 5/9 to get Celsius, then add 273.15 for the absolute scale.
What is 32°F in Kelvin?
32°F = 273.15 K. The freezing point of water on the absolute scale.
What is 212°F in Kelvin?
212°F = 373.15 K. The boiling point of water at standard pressure.
What is 0°F in Kelvin?
0°F ≈ 255.37 K. About -17.78°C — typical of a cold winter day.
More Temperature Conversions
- Kelvin to Fahrenheit — the reverse direction
- Fahrenheit to Celsius — same starting scale, different target
- Fahrenheit to Rankine — same starting scale, different target
- Celsius to Kelvin — different starting scale, same target
- Rankine to Kelvin — different starting scale, same target
- All-scale Temperature Converter — see Celsius, Fahrenheit, Kelvin, and Rankine at once
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