Temperature Converter
This temperature converter turns Celsius to Fahrenheit, Fahrenheit to Celsius, and both scales to Kelvin. Type a number, pick the units, and the answer appears right away. Everything runs in your browser, so nothing you type leaves your device.
How temperature conversion works
Temperature scales do not start at the same point, so converting takes more than plain multiplication. The tool changes your value to Celsius first, then to the unit you want, using these exact formulas:
- °F = (°C × 9/5) + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
- °C = K − 273.15
Results are rounded to 2 decimal places.
Common temperatures: a quick reference
Check everyday temperatures at a glance.
| What it is | Fahrenheit (°F) | Celsius (°C) | Kelvin (K) |
|---|---|---|---|
| Water freezes | 32 | 0 | 273.15 |
| Room temperature | 68 | 20 | 293.15 |
| Human body | 98.6 | 37 | 310.15 |
| Water boils | 212 | 100 | 373.15 |
Solved example: 25 °C to °F and K
A warm spring day is 25 °C. Here is the math, step by step.
- To Fahrenheit: °F = (25 × 9/5) + 32 = 45 + 32 = 77.
- To Kelvin: K = 25 + 273.15 = 298.15.
Answer: 25 °C = 77 °F = 298.15 K.
How to use this converter
- Type the temperature into the box.
- Pick the unit you are converting from and the unit you want.
- Press Convert and read the result with the formula the tool used.
Limits: what this converter does not do
- Kelvin cannot go below 0, and no temperature can drop below −273.15 °C (absolute zero). The tool shows an error for such values.
- It converts the temperature on the thermometer only. It does not work out wind chill, heat index, or “feels like” values, which also need humidity and wind speed.
- Results are rounded to 2 decimal places, so very fine lab measurements may lose a tiny bit of precision.
Frequently asked questions
Why does the temperature converter add 32 for Celsius to Fahrenheit?
Because the two scales start at different points. Water freezes at 0 °C but at 32 °F, so the formula shifts every value by 32 after scaling by 9/5.
Can temperature go below zero?
Yes in Celsius and Fahrenheit: a winter day can be −10 °C. Kelvin is different. 0 K is absolute zero, the coldest anything can be, so the tool rejects negative Kelvin values.
Why is body temperature 98.6 °F?
It is the same warmth as 37 °C written in Fahrenheit: (37 × 9/5) + 32 = 98.6. The two numbers describe the same temperature.
Can I convert oven temperatures with this tool?
Yes. US recipes use Fahrenheit and most other recipes use Celsius, and the math is the same. For example, 180 °C = 356 °F, a common baking temperature.
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