Temperature Converter
Convert Celsius, Fahrenheit & Kelvin instantly.
100% private — runs in your browser, nothing is uploaded.
| Reference | °C | °F |
|---|---|---|
| Water freezes | 0 | 32 |
| Room temperature | 20 | 68 |
| Body temperature | 37 | 98.6 |
| Water boils | 100 | 212 |
How to use the Temperature Converter
- 1Enter a temperature
Type the value you want to convert.
- 2Choose the source scale
Select whether your value is in Celsius, Fahrenheit or Kelvin.
- 3See all three
The tool instantly shows the equivalent in all three scales, with your input highlighted.
- 4Use the reference table
Check common temperatures like freezing, room and boiling point below.
Examples
| Input | Output |
|---|---|
25 °C | 77 °F · 298.15 K |
98.6 °F | 37 °C |
0 K | −273.15 °C (absolute zero) |
Free online temperature converter
This temperature converter switches between Celsius, Fahrenheit and Kelvin in one step. Enter any single value and its source scale, and all three equivalents appear instantly — perfect for cooking, weather, travel and science.
The conversion formulas
- Celsius → Fahrenheit: (°C × 9/5) + 32
- Fahrenheit → Celsius: (°F − 32) × 5/9
- Celsius → Kelvin: °C + 273.15
- Kelvin → Celsius: K − 273.15
Handy reference points
Water freezes at 0°C (32°F) and boils at 100°C (212°F). Comfortable room temperature is around 20°C (68°F), and normal human body temperature is about 37°C (98.6°F). Because the tool runs entirely in your browser, conversions are instant and private, and it works offline.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 25°C × 9/5 + 32 = 77°F. This tool does it automatically and shows Kelvin too.
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. For example, (98.6°F − 32) × 5/9 = 37°C — normal body temperature.
What is Kelvin and how does it relate to Celsius?
Kelvin is the SI temperature scale that starts at absolute zero. To convert, add 273.15 to Celsius: 0°C = 273.15 K. Kelvin has no negative values and no degree symbol.
What is absolute zero?
Absolute zero is the lowest possible temperature: 0 K, which equals −273.15°C or −459.67°F. At this point, molecular motion is at its theoretical minimum.
Which countries use Fahrenheit?
Fahrenheit is mainly used in the United States and a few other territories. Most of the world uses Celsius for everyday temperatures and Kelvin in science.
Is the converter private?
Yes. All conversions run in your browser, so nothing you enter is uploaded, and the tool works even without an internet connection.
Related tools
Unit Converter
Convert length, weight, volume, area, speed & data.
Open tool NewColor Converter
Convert HEX, RGB & HSL with a live preview.
Open tool NewCSV to JSON Converter
Convert CSV to JSON and JSON back to CSV.
Open tool NewEpoch / Unix Timestamp Converter
Convert Unix timestamps to dates and back.
Open tool