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Temperature Converter

Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly online. Free temperature converter — enter a value, pick the unit, get all three at once. No signup required.

Temperature (Celsius)

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Temperature is one of the most commonly converted measurements, with three scales in wide use: Celsius (°C), used in most of the world for everyday temperature; Fahrenheit (°F), used primarily in the United States for weather and cooking; and Kelvin (K), used in scientific contexts because it starts at absolute zero (the lowest possible temperature, 0 K = -273.15 °C), making thermodynamic calculations straightforward.

The relationships between scales are linear but not directly proportional: °F = (°C × 9/5) + 32, °C = (°F - 32) × 5/9, K = °C + 273.15. Kelvin uses the same degree size as Celsius, just shifted by 273.15. These conversions appear across cooking recipes, weather data from international sources, scientific literature, engineering datasheets, and thermostat settings when working with international equipment.

This tool converts among all three temperature scales simultaneously: enter a value in any unit and the converted values appear instantly for the other two. Results are displayed to two decimal places. All three output rows have individual copy buttons so you can grab just the value you need.

Common Use Cases

Converting international cooking recipes

British and European recipes commonly specify oven temperatures in Celsius (e.g., 180 °C), while American recipes use Fahrenheit (e.g., 350 °F). Baking is sensitive to temperature: a 10-degree error can mean the difference between a properly set custard and a curdled one. Converting before preheating the oven ensures the dish is cooked at the intended temperature.

Reading weather data across regions

Travelers, remote workers, and international news consumers regularly need to translate temperatures when checking weather forecasts. A forecast of 35 °C in a European news article translates to 95 °F — recognizable as a very hot day to American readers. Weather APIs often return values in Celsius; displaying them to US users requires conversion.

Scientific and engineering calculations

Physics and chemistry equations involving temperature (ideal gas law, Stefan-Boltzmann law, thermodynamic efficiency calculations) require Kelvin to avoid negative absolute temperatures and division-by-zero errors. Engineers converting a real-world operating temperature in Celsius to Kelvin for a thermal model need precise conversion including the 273.15 offset.

Understanding medical temperature references

Medical literature and drug storage requirements reference both Celsius (standard in global pharmacopoeias) and Fahrenheit (US clinical practice). A vaccine requiring storage at 2–8 °C needs to be verified against a refrigerator displaying Fahrenheit. Normal human body temperature (37 °C / 98.6 °F) and fever thresholds differ depending on the scale used.

Temperature Conversion Formulas

Common Reference Points