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Temperature converter
Celsius, Fahrenheit and Kelvin. The only common category where you cannot just multiply. 4 units, converted from one table of exact factors.
Worth knowing. These three scales do not just run at different speeds, they start in different places. That is why there is no single number you can multiply by — and why −40° is the one reading that is the same in Celsius and Fahrenheit.
1 celsius in every other temperature unit
Computed by the same engine that runs the converter above, so these can never drift apart from it.
| From | Equals | Unit |
|---|---|---|
| 1 celsius | 33.8 | fahrenheit (°F) |
| 1 celsius | 274.15 | kelvin (K) |
| 1 celsius | 493.47 | rankine (°R) |
What each unit actually is
Most converters give you a number and stop. Where a figure is exact by definition we say so, and where it is an average or shifts with conditions we say that too — that is usually the thing you needed to know.
| Unit | Symbol | What it actually is |
|---|---|---|
| celsius | °C | Water freezes at 0 and boils at 100 at sea level. Since 2019 it is defined from the kelvin. |
| fahrenheit | °F | Water freezes at 32 and boils at 212. −40° is the one temperature that reads the same in both scales. |
| kelvin | K | Absolute zero is 0 K. No degree sign, by convention. 0°C is 273.15 K exactly. |
| rankine | °R | Fahrenheit-sized degrees counted from absolute zero. Still used in some US engineering. |
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