Convert Fahrenheit to Kelvin
Instantly convert Fahrenheit (°F) to Kelvin (K) with our free online calculator.
Formula: °F to K — (°F − 32) × 5/9 + 273.15
Reference Table
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| 1 | 255.928 |
| 5 | 258.15 |
| 10 | 260.928 |
| 25 | 269.261 |
| 50 | 283.15 |
| 100 | 310.928 |
How to Convert Fahrenheit to Kelvin
Formula
To convert Fahrenheit (°F) to Kelvin (K): (°F − 32) × 5/9 + 273.15
Step-by-Step
- Start with your value in Fahrenheit (°F).
- (°F − 32) × 5/9 + 273.15 to perform the conversion.
- The result is your value expressed in Kelvin (K).
Conversion Factor
1 °F = 255.928 K
Reverse Factor
1 K = -457.87 °F
Worked Example
Convert 25 Fahrenheit to Kelvin: 25 °F = 269.261 K
About Fahrenheit (°F)
A temperature scale introduced by physicist Daniel Gabriel Fahrenheit in 1724, on which water freezes at 32° and boils at 212° under standard atmospheric pressure. Fahrenheit remains the dominant temperature scale in the United States for weather reporting, oven and cooking temperatures, and HVAC settings. The smaller degree interval (5°F ≈ 2.78°C) gives more precision in everyday conversation about weather — partly why American forecasters and thermostats still prefer it despite global metric adoption.
About Kelvin (K)
The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Named after Lord Kelvin and defined since 2019 by fixing the numerical value of the Boltzmann constant. Kelvin shares its degree interval with Celsius (1 K = 1°C), so conversion is a straight offset. Scientific publications, thermodynamic formulas, cryogenic physics, and plasma physics exclusively use kelvin because absolute-zero-referenced math stays dimensionally clean.
Quick Facts
- 1 Fahrenheit equals 255.928 Kelvin
- 1 Kelvin equals -457.87 Fahrenheit
- Fahrenheit is a unit of temperature
- Kelvin is a unit of temperature
- This conversion is commonly used in weather forecasting, cooking, scientific experiments, and HVAC
- The Fahrenheit belongs to the imperial system
- The Kelvin belongs to the metric system
Common Fahrenheit to Kelvin Conversions
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| -40 | 233.15 |
| -20 | 244.261 |
| -10 | 249.817 |
| 0 | 255.372 |
| 5 | 258.15 |
| 10 | 260.928 |
| 15 | 263.706 |
| 20 | 266.483 |
| 25 | 269.261 |
| 30 | 272.039 |
| 35 | 274.817 |
| 37 | 275.928 |
| 40 | 277.594 |
| 50 | 283.15 |
| 60 | 288.706 |
| 70 | 294.261 |
| 80 | 299.817 |
| 90 | 305.372 |
| 100 | 310.928 |
| 150 | 338.706 |
| 200 | 366.483 |
Understanding Fahrenheit
The Fahrenheit (symbol: °F) is a unit of temperature. A temperature scale introduced by physicist Daniel Gabriel Fahrenheit in 1724, on which water freezes at 32° and boils at 212° under standard atmospheric pressure. Fahrenheit remains the dominant temperature scale in the United States for weather reporting, oven and cooking temperatures, and HVAC settings. The smaller degree interval (5°F ≈ 2.78°C) gives more precision in everyday conversation about weather — partly why American forecasters and thermostats still prefer it despite global metric adoption.
It belongs to the imperial measurement system.
Fahrenheit are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Understanding Kelvin
The Kelvin (symbol: K) is a unit of temperature. The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Named after Lord Kelvin and defined since 2019 by fixing the numerical value of the Boltzmann constant. Kelvin shares its degree interval with Celsius (1 K = 1°C), so conversion is a straight offset. Scientific publications, thermodynamic formulas, cryogenic physics, and plasma physics exclusively use kelvin because absolute-zero-referenced math stays dimensionally clean.
It belongs to the metric measurement system.
Kelvin are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Why Convert Fahrenheit to Kelvin?
Converting between Fahrenheit and Kelvin is essential for a variety of everyday and professional tasks. International recipes list oven temperatures in different scales, weather reports from other countries use unfamiliar units, and scientists must reconcile data recorded under different conventions. Medical professionals also compare body temperature readings that may be reported in different units depending on the country or device.
Frequently Asked Questions
How do I convert Fahrenheit to Kelvin?
A temperature scale introduced by physicist Daniel Gabriel Fahrenheit in 1724, on which water freezes at 32° and boils at 212° under standard atmospheric pressure. To convert Fahrenheit to Kelvin, (°F − 32) × 5/9 + 273.15. For example, 25 °F equals 269.261 K.
How many Kelvin are in 1 Fahrenheit?
There are 255.928 Kelvin in 1 Fahrenheit.
How many Fahrenheit are in 1 Kelvin?
There are -457.87 Fahrenheit in 1 Kelvin.
What is the formula for Fahrenheit to Kelvin conversion?
The formula is: (°F − 32) × 5/9 + 273.15. This means 1 °F = 255.928 K.
Is a Fahrenheit bigger than a Kelvin?
No. One Fahrenheit is smaller than one Kelvin because 1 °F equals 255.928 K, which is greater than 1.
When do you need to convert between Fahrenheit and Kelvin?
The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Fahrenheit and Kelvin are both temperature units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.