Temperature Converter

The Temperature Converter is a free online temperature converter that translates between Celsius, Fahrenheit and Kelvin instantly. Enter a temperature in any one scale and see its equivalent in the other two at once — useful for checking a weather report from another country, following a cooking or baking temperature given in the 'wrong' scale, converting a scientific measurement to Kelvin for a physics problem, or simply settling an argument about how hot today's forecast actually is. It works equally well for quick everyday questions and for classroom or lab settings where the exact figure matters.

Because celsius to fahrenheit and fahrenheit to celsius conversions come up constantly — international recipes, oven temperatures, thermostat settings, medical charts, appliance manuals imported from another country — the tool is built to handle both directions equally, plus the kelvin scale used throughout science and engineering. Type into any of the three fields and the other two update immediately, so there's no need to remember which direction a formula runs or to keep a separate cheat sheet on hand.

Unlike length or weight, temperature scales don't share a common zero point, so simple multiplication isn't enough — the tool applies the proper linear formulas for each pair: °F = °C × 9/5 + 32, °C = (°F − 32) × 5/9, and K = °C + 273.15. These are exact relationships, not approximations, so a boiling-point check (100 °C = 212 °F = 373.15 K) or an absolute-zero calculation (0 K = −273.15 °C = −459.67 °F) comes out precisely right every time. Negative values and decimals are fully supported in all three fields.

The conversion happens as you type, entirely inside your browser, with no server round-trip and no data collected. It works equally well for a quick weather check on your phone as it does for double-checking a lab report on a desktop.