What does this tool do?
The Temperature Converter instantly converts a value between Celsius (°C), Fahrenheit (°F) and Kelvin (K). It is handy for anyone adapting recipes, reading weather forecasts, doing physics homework or comparing equipment specifications across regions.
How to use it
- Paste or type your data into the left field.
- The result is generated instantly on the right.
- Use the Copy button to grab the output.
The formulas behind the conversion
The tool uses the standard equations. Celsius to Fahrenheit: °F = °C × 9/5 + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Kelvin is simply the Celsius scale shifted to start at absolute zero: K = °C + 273.15. Because the step size is identical in Celsius and Kelvin, they differ only by that 273.15 offset, whereas Fahrenheit uses both a different zero point and a different degree size.
Everyday reference points
Memorising a few values makes quick sense-checks easy. Water freezes at 0 °C / 32 °F and boils at 100 °C / 212 °F at sea level. Normal body temperature is about 37 °C / 98.6 °F. A comfortable room sits around 20–22 °C, roughly 68–72 °F. Scientific absolute zero is 0 K = −273.15 °C, and no lower temperature is physically possible.
Frequently asked questions
Why does Kelvin have no degree symbol?
Kelvin is an absolute scale that starts at absolute zero, so it is not measured in 'degrees' relative to a reference point. The correct notation is, for example, '300 K', not '300 °K'.
At what temperature are Celsius and Fahrenheit equal?
The two scales meet only at −40 degrees: −40 °C equals exactly −40 °F. It is a handy checkpoint for confirming that a conversion formula is correct.
Can I enter a negative Kelvin value?
Physically you cannot go below absolute zero (0 K), as it is the lowest possible temperature. A Kelvin value under 0 K does not correspond to any real physical temperature.
Is Temperature Converter free?
Yes. Temperature Converter and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. Temperature Converter works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.