Convert Fahrenheit to Kelvin
72 degrees Fahrenheit is 295.37 K. The formula is (°F − 32) × 5/9 + 273.15 — a scale conversion, not a factor.
72 °F is 295.37222 K. To convert degrees Fahrenheit to kelvins, apply (°F − 32) × 5/9 + 273.15. It is a scale conversion rather than a factor: the two scales differ in where zero sits as well as in the size of a degree. Check it against a fixed point: water freezes at 32 °F, which is 273.15 K. Both scales are defined off the kelvin, which has been fixed since 2019 by the Boltzmann constant.
Factor checked against the defining standard · How we check
- (°F − 32) × 5/9 + 273.15
(72 - 32) * 5 / 9 + 273.15295.372 K
72 degrees Fahrenheit in every temperature unit
| Unit | Value | Formula |
|---|---|---|
| degrees Celsius | 22.22222222 °C | (°F − 32) × 5/9 |
| degrees Fahrenheit (as entered) | 72 °F | — |
| kelvins | 295.3722222 K | (°F − 32) × 5/9 + 273.15 |
| degrees Rankine | 531.67 °R | °F + 459.67 |
Each scale is defined off the kelvin, so these are exact relations rather than measured ones — only the display is rounded.
How do you convert degrees Fahrenheit to kelvins? The converter and the working
- 1.Take the temperature in degrees Fahrenheit.
- 2.Apply (°F − 32) × 5/9 + 273.15 — the two scales differ in where zero sits as well as in how big a degree is, so this is a line rather than a single multiplication.
- 3.Sanity-check against a fixed point: 32 °F is 273.15 K, where water freezes.
Worked example: 25 degrees Fahrenheit to kelvins
- Formula
- (°F − 32) × 5/9 + 273.15 = K
- Arithmetic
- (25 − 32) × 5/9 + 273.15 = 269.26 K
- Answer
- 25 °F = 269.26 K
The relation is exact by definition — both scales are fixed to the kelvin — so only the display is rounded.
Degrees Fahrenheit to kelvins conversion table
| Degrees Fahrenheit | Kelvins |
|---|---|
| -40 °F | 233.15 K |
| 0 °F | 255.37 K |
| 20 °F | 266.48 K |
| 32 °F | 273.15 K |
| 40 °F | 277.59 K |
| 50 °F | 283.15 K |
| 60 °F | 288.71 K |
| 70 °F | 294.26 K |
| 72 °F | 295.37 K |
| 80 °F | 299.82 K |
| 90 °F | 305.37 K |
| 98.6 °F | 310.15 K |
| 100 °F | 310.93 K |
| 212 °F | 373.15 K |
| 325 °F | 435.93 K |
| 350 °F | 449.82 K |
| 375 °F | 463.71 K |
| 400 °F | 477.59 K |
| 425 °F | 491.48 K |
| 450 °F | 505.37 K |
What is a degree Fahrenheit?
The US everyday scale, with water freezing at 32 and boiling at 212 — 180 degrees apart, which is why a Fahrenheit degree is exactly five ninths of a Celsius one. Daniel Fahrenheit set his zero at the coldest temperature he could reproduce in 1724, a brine ice bath.
What is a kelvin?
The SI base unit, counted from absolute zero and defined since 2019 by fixing the Boltzmann constant. It takes no degree sign and no "degrees": a temperature is 293 K, not 293 °K.
The points to check a conversion against
water freezes at 32 °F, which is 273.15 K; body temperature at 98.6 °F, which is 310.15 K; water boils at 212 °F, which is 373.15 K. Absolute zero is -459.67 °F and 0 K — nothing is colder, which is why a converter returning a temperature below it is wrong rather than merely cold.
Every temperature unit here
The whole group — 4 units with their symbols and the size of each one in kelvins — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a degree Fahrenheit.
Source: NIST — the kelvin and the International Temperature Scale
Cite this page
- APA
- Rule Calculator. (2026). Convert Degrees Fahrenheit to kelvins. Rule Calculator. https://rulecalculators.com/convert/fahrenheit-to-kelvin
- MLA
- "Convert Degrees Fahrenheit to kelvins." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/fahrenheit-to-kelvin.
- Chicago
- Rule Calculator. "Convert Degrees Fahrenheit to kelvins." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/fahrenheit-to-kelvin.
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Questions people actually ask
- What is the formula to convert degrees Fahrenheit to kelvins?
- (°F − 32) × 5/9 + 273.15. Unlike every other conversion on this site, this is not a multiplication: the two scales put zero in different places, so the shift matters as much as the step size.
- What is 32 °F in kelvins?
- 273.15 K. That is the freezing point of water, and it is the fastest way to check any converter — including this one.
- Is it "degrees Kelvin"?
- No. The kelvin is a unit like the meter, not a scale reading, so a temperature is written 293 K — no degree sign and no "degrees". It was changed by the 13th General Conference on Weights and Measures in 1967, and it is the one piece of temperature notation that is actually a rule rather than a convention.
- What is absolute zero in kelvins?
- 0 K. Nothing can be colder: it is the point where a system holds no thermal energy to give up, and the kelvin and Rankine scales both start there rather than at an arbitrary reference.
Other temperature conversions
Kelvins to degrees Fahrenheit — the same conversion the other way.