Temperature Converter
Convert a temperature between Celsius, Fahrenheit and Kelvin using the correct formulas. Converts instantly in your browser.
Also searched as: celsius to fahrenheit · fahrenheit to celsius · c to f · f to c
Updated November 6, 2026
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How to use it
- 1
Enter a value
Type the temperature you want to convert.
- 2
Pick the scales
Choose what to convert from and to.
- 3
Read the result
The answer updates as you type.
Questions about temperature converter
What is 0°C in Fahrenheit?
32°F. And 100°C is 212°F.
Does it use formulas or factors?
Formulas — temperature scales have offsets, so simple factors would be wrong.
Is anything uploaded?
No, the conversion runs on your device.
The formulas behind the answer
Celsius and Fahrenheit do not start at the same point, so a single multiplier is not enough. To go from Celsius to Fahrenheit, multiply by 9/5 and add 32. To go from Fahrenheit to Celsius, subtract 32 and multiply by 5/9. Kelvin uses the same step size as Celsius but starts at absolute zero, so Kelvin equals Celsius plus 273.15. Kelvin is written without a degree sign.
The table lists well-known reference points, so you can sanity-check any result at a glance.
| Reference point | °C | °F | K |
|---|---|---|---|
| Absolute zero | -273.15 | -459.67 | 0 |
| Water freezes | 0 | 32 | 273.15 |
| Typical room temperature | 20 | 68 | 293.15 |
| Normal body temperature (about) | 37 | 98.6 | 310.15 |
| Water boils at sea level | 100 | 212 | 373.15 |
| Same number on both scales | -40 | -40 | 233.15 |
Worked examples
An oven set to 180 °C is 356 °F, which many recipes round to 350 °F. A mild 25 °C day is 77 °F, and a fridge at 5 °C is 41 °F.
For a rough mental estimate of Celsius to Fahrenheit, double the number and add 30. It is close enough for weather, but use the exact formula for cooking, lab work or anything that needs accuracy.