Convert Fahrenheit to Kelvin Online — Free °F to K Calculator
Convert °F to K as you type.
Temp Converter AustraliaReference for one unit; displayed values may be rounded.
Fahrenheit
Use a dot or comma for decimals, without thousands separators.
Kelvin
Display rounding does not improve the accuracy of your original measurement. Very large or very small results use scientific notation.
Method and sourceFahrenheit to Kelvin Conversion Formula
Fahrenheit and Kelvin Explained
Fahrenheit (°F)
The Fahrenheit scale (symbol °F) sets water's freezing point at 32° and its boiling point at 212°, placing exactly 180 degrees between them. Its zero was calibrated against the coldest brine mixture Daniel Gabriel Fahrenheit could produce, which conveniently maps everyday weather onto a 0-to-100 band. One Fahrenheit degree equals five-ninths of a Celsius degree, giving finer graduations on oven dials and thermostats — the devices that still make it the everyday US standard.
Where it is used: Weather, cooking and clinical temperatures in the United States; still encountered by Australians in imported appliances, US datasheets and the odd vintage thermometer or cookbook from the op shop.
Origin: Daniel Gabriel Fahrenheit, a Polish-born Dutch instrument maker, published the scale in 1724; his precision mercury thermometers carried it across the English-speaking world.
Kelvin (K)
The kelvin (symbol K, no degree sign) is the SI base unit of thermodynamic temperature, anchored to absolute zero and defined since 2019 by an exact value of the Boltzmann constant. Water freezes at 273.15 K and boils at 373.15 K, and each kelvin step is the same size as a Celsius degree — but unlike Fahrenheit or Celsius, the scale never goes below zero. That makes it the required input for gas laws, radiation laws, and every formula where energy scales with true temperature.
Where it is used: Science and engineering worldwide: thermodynamics, cryophysics, astrophysics, plus senior secondary and university physics and chemistry courses across Australia, where absolute temperature is a must.
Origin: Lord Kelvin proposed the absolute scale in 1848; it became an SI base unit in 1960, lost its degree symbol in 1968, and was redefined via the Boltzmann constant in 2019.
Fahrenheit to Kelvin Conversion Table
Select a value to use it in the calculator.
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| 0 K | |
| 233.15 K | |
| 244.2611111111 K | |
| 255.3722222222 K | |
| 260.9277777778 K | |
| 266.4833333333 K | |
| 273.15 K | |
| 283.15 K | |
| 293.15 K | |
| 294.2611111111 K | |
| 299.8166666667 K | |
| 305.3722222222 K | |
| 310.15 K | |
| 310.9277777778 K | |
| 322.0388888889 K | |
| 373.15 K | |
| 449.8166666667 K | |
| 533.15 K | |
| 810.9277777778 K | |
| 3033.15 K |
Kelvin to Fahrenheit Conversion Table
| Kelvin (K) | Fahrenheit (°F) |
|---|---|
| 0 K | -459.67 °F |
| 77 K | -321.07 °F |
| 233.15 K | -40 °F |
| 255.372 K | -0.0004 °F |
| 273.15 K | 32 °F |
| 293.15 K | 68 °F |
| 298.15 K | 77 °F |
| 300 K | 80.33 °F |
| 310.15 K | 98.6 °F |
| 373.15 K | 212 °F |
| 933 K | 1219.73 °F |
| 1337 K | 1946.93 °F |
| 1811 K | 2800.13 °F |
| 5772 K | 9929.93 °F |
Fahrenheit to Kelvin in Everyday Objects
Common real-world examples that make Fahrenheit and Kelvin easy to picture at a glance.
| Fahrenheit (°F) | Kelvin (K) | |
|---|---|---|
| Absolute zero | -459.67 °F | 0 K |
| Charlotte Pass record low | -80 °F | 210.9277777778 K |
| Water freezing point | 32 °F | 273.15 K |
| Comfortable room thermostat | 70 °F | 294.2611111111 K |
| Human body temperature | 98.6 °F | 310.15 K |
| Water boiling point | 212 °F | 373.15 K |
| Incandescent bulb filament | 4580.33 °F | 2800 K |
| Sun surface temperature | 9929.93 °F | 5772 K |
When You Need Fahrenheit to Kelvin Conversions
Imported instruments, SI manuscripts
A bench data-logger bought from the States records 68°F, but your honours thesis needs SI units — one entry converts it to exactly 293.15 K for the results table, no Celsius middle step.
Thermodynamics with US-sourced data
Heat-duty and gas-law calculations demand absolute temperature: a process line at a Pilbara gas plant running at 300°F feeds in as 422.04 K, keeping every downstream figure in clean SI units.
Melting points across unit systems
Imported forging specs quote 2800°F while SI phase diagrams chart iron at 1811 K — the direct conversion (2800°F = 1810.93 K) confirms the alloy will be fully molten with one entry.
Low-temperature physics
Cryocooler spec sheets mix systems: a cold finger rated at -452°F converts to about 4.26 K, instantly flagging it as liquid-helium-range kit for the lab inventory.
Related Temperature Conversions
How to Use
-
1
Enter the Fahrenheit Value
Type the temperature exactly as it appears on the US datasheet or thermometer — for example, enter 70 for a comfortable room (about 21°C)
-
2
See the Kelvin Result
The absolute temperature appears instantly: 70°F = 294.26 K, ready to drop into any SI thermodynamic calculation
-
3
Copy or Swap
Copy the result or click Swap to convert Kelvin back to Fahrenheit
-
4
Check the Reference Table
Browse the table for anchors like 32°F = 273.15 K (ice melts), 0°F = 255.37 K (about your freezer) or -459.67°F = 0 K (absolute zero)
Why Use Be Converter?
Skip the Two-Step Detour
Go straight from a US thermometer reading like 70°F (a pleasant 21°C) to 294.26 K in real time — no detour through Celsius
Exact Combined Formula
Applies K = (°F - 32) × 5/9 + 273.15 exactly, so 212°F — water's boiling point — returns precisely 373.15 K every time
Cross-System Reference Table
Bridge anchors at a glance — absolute zero (-459.67°F = 0 K), ice melting (32°F = 273.15 K), and iron melting (2800°F ≈ 1811 K, foundry territory)
Swap with One Click
Flip to Kelvin to Fahrenheit instantly when an SI datasheet has to be dialled into a US-calibrated controller
Free & No Sign-Up
Unlimited conversions for labs, workshops and classrooms — always free, no account needed
Runs Locally
Every calculation happens in your browser. No temperature data is ever sent to a server
Frequently Asked Questions
What is the formula to convert Fahrenheit to Kelvin?
What is 32°F in Kelvin?
What is absolute zero in Fahrenheit?
What is body temperature in Kelvin?
Can I convert Fahrenheit to Celsius first?
What is 1000°F in Kelvin?
What is 0°F in Kelvin?
How hot is the surface of the sun in Fahrenheit and Kelvin?
About the Fahrenheit to Kelvin Converter
Our free online Fahrenheit to Kelvin converter jumps straight from the US temperature scale to the SI absolute scale in one step, using the combined formula K = (°F - 32) × 5/9 + 273.15. Whether you're translating US instrument logs for a research paper, feeding Fahrenheit process data into a heat-duty calculation at a Pilbara gas plant, checking an imported kiln's spec sheet, or sizing cryogenic gear for a university lab, this tool delivers instant, exact results. The Fahrenheit scale, published by Daniel Gabriel Fahrenheit in 1724, and the Kelvin scale, established by Lord Kelvin in 1848 and now an SI base unit, sit at opposite ends of the measurement world — this converter is the shortest path between them.
Expert Tips for Fahrenheit to Kelvin Conversion
Order matters: subtract 32 before multiplying by 5/9. Skipping the subtraction puts you about 17.8 K high — a classic slip in rushed lab maths.
Memorise the bridge anchors: -459.67°F = 0 K (absolute zero), 32°F = 273.15 K (freezing), 98.6°F = 310.15 K (body temperature), 212°F = 373.15 K (boiling).
Some readings land on clean values: 68°F converts to exactly 293.15 K and 5000°F to exactly 3033.15 K, because their Celsius equivalents (20°C and 2760°C) are whole numbers.
High-temperature engineering references: 1000°F = 810.93 K, 2000°F = 1366.48 K, and 2800°F = 1810.93 K — right at iron's melting point, handy for forge and heat-treatment work.
Because Australians grow up on Celsius, a quick sanity check via Celsius is second nature — but when reporting against US documents, list both units side by side and verify with the Swap button; mixing up the 5/9 and 9/5 factors is the most common cross-system conversion mistake.
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