Free Temperature Converter

The Temperature Converter is a free online tool that converts between Celsius, Fahrenheit, and Kelvin temperature scales instantly.

Yes, it is completely free with no registration required. All conversions happen client-side in your browser.

The Temperature Converter supports Celsius, Fahrenheit, and Kelvin, covering all commonly used temperature scales worldwide.

Absolutely. The Temperature Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Temperature Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Temperature Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Temperature Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

To convert Celsius to Fahrenheit, multiply the temperature by 9/5 (1.8) and then add 32, using the formula °F = °C × 9/5 + 32. For example, 20 °C becomes 20 × 1.8 = 36, plus 32, which equals 68 °F. To go the other way, subtract 32 first and then multiply by 5/9: °C = (°F − 32) × 5/9. A few anchors are worth memorizing so you can sanity-check results: 0 °C is 32 °F (water freezing), 37 °C is 98.6 °F (body temperature), and 100 °C is 212 °F (water boiling at sea level). Doing this by hand is easy to slip up on, especially the order of operations. Enter any Celsius value in the converter above and it shows the exact Fahrenheit result instantly, along with the formula it used so you can follow the math.

All three measure temperature but use different zero points and step sizes. Celsius is the everyday metric scale where water freezes at 0° and boils at 100° at sea level. Fahrenheit, standard in the United States, puts freezing at 32° and boiling at 212°, so its degrees are smaller and the scale is shifted. Kelvin is the SI base unit used in science: it starts at absolute zero (−273.15 °C), the coldest possible temperature, and shares Celsius-sized steps, so you simply add 273.15 to a Celsius value to get Kelvin. Kelvin never goes negative and uses no degree symbol. Choosing the right scale matters because recipes, weather reports, and lab protocols each assume a specific one. The converter handles all three, plus nine more scales, and displays every equivalent at once so nothing gets mixed up.

Kelvin is an absolute scale, meaning its zero point is the lowest temperature physically possible — absolute zero, where molecular motion effectively stops, equal to −273.15 °C. Because nothing can be colder than absolute zero, Kelvin values are always zero or positive; a negative Kelvin reading is impossible. It is also the SI base unit for temperature and is treated as a unit of measure rather than a position on a graded dial, which is why scientists write "300 K" rather than "300 °K" — the degree symbol was officially dropped in 1967. Each Kelvin step is exactly the same size as one Celsius degree, so conversions are just a 273.15 shift with no scaling. This makes Kelvin ideal for physics and chemistry, where ratios of temperature matter. Type a Celsius or Fahrenheit value above to see its exact Kelvin equivalent at once.

Feels-like temperature describes how hot or cold the air actually feels to your body, which can differ sharply from the thermometer reading. In cold weather, wind strips away the thin layer of warm air around your skin, making it feel colder — this is wind chill, calculated from air temperature and wind speed. In hot weather, high humidity slows the sweat evaporation that normally cools you, making it feel hotter — this is the heat index, based on temperature and relative humidity. Both effects can shift the perceived temperature by several degrees, which matters for frostbite risk in winter and heat exhaustion in summer. The converter includes a feels-like calculator: enter a Celsius temperature plus a wind speed or humidity figure, and it estimates the wind chill or heat index for you, with the result shown in both Celsius and Fahrenheit.

Gas Mark is the numbered dial found on many British and Irish gas ovens, and each number maps to a specific temperature. As a rough guide, Gas Mark 1 is about 140 °C (275 °F), Gas Mark 4 — a common "moderate" baking setting — is around 180 °C (350 °F), Gas Mark 6 is roughly 200 °C (400 °F), and Gas Mark 9 reaches about 240 °C (475 °F). Each step up adds roughly 14 °C (25 °F). This matters because a recipe written in Gas Mark, Celsius, or Fahrenheit can leave food undercooked or burnt if you guess wrong — setting an oven to 180 °F instead of 180 °C, for instance, leaves a bake raw. The converter includes Gas Mark among its twelve scales, so you can enter a Celsius or Fahrenheit value and read the matching oven setting straight away.