What this temperature converter does
This tool turns a temperature from one scale into another: Celsius, Fahrenheit, or Kelvin, in any direction. It is handy for students checking homework, cooks following a recipe written for a different country, travelers reading a foreign weather forecast, and anyone in science or engineering who juggles Kelvin. You pick the two scales, enter a number, and read the answer right away.
How to use it
- Type the temperature into the Value box (you can use decimals and negatives, like 98.6 or -10).
- Pick the scale your number is currently in from the From row: Celsius, Fahrenheit, or Kelvin.
- The other scales appear instantly below, for example
25 °C = 77.00 °F, with nothing to click. - Tap any scale to copy its value to your clipboard.
The Fahrenheit result is rounded to two decimals, which is plenty for cooking, weather, and everyday use.
Why convert here
It is quick. There is no waiting on a server, because the calculation happens on your own device as you type. That also keeps it private: the number you enter never leaves your browser, and the page keeps working even if your connection drops.
It is free and open, with no account, no pop-ups, and no daily cap. The conversions follow the standard formulas, so Celsius to Fahrenheit uses (C x 9/5) + 32, and Kelvin offsets Celsius by 273.15. Same answers a textbook would give.
A quick tip
A few anchor points make sanity-checking easy: 0 °C equals 32 °F, body temperature is roughly 37 °C or 98.6 °F, and a comfortable room sits near 21 °C or 70 °F. If a result looks far off from these, double-check which scale you set in the From box.
Frequently asked questions
- How do I convert Celsius to Fahrenheit?
- Type your number in the Value field and pick Celsius in the From row. The Fahrenheit result appears instantly alongside Kelvin. For example, 25 Celsius shows as 77.00 Fahrenheit. The formula it uses is (C x 9/5) + 32.
- Can this converter handle Kelvin?
- Yes. Kelvin is one of the three scales in the From row, and it always appears in the results, so you can read Celsius to Kelvin, Fahrenheit to Kelvin, or the other way at a glance. Water freezes at 273.15 K and boils at 373.15 K.
- Does it work for negative temperatures?
- It does. Enter a minus sign before the number, like -40, and the converter handles it. A fun fact: -40 reads the same in both Celsius and Fahrenheit.
- Is my input sent anywhere?
- No. The math runs entirely in your browser with JavaScript, so nothing you type is uploaded or stored. It also works offline once the page has loaded.
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Last updated: June 15, 2026