Temperature Converter

A temperature converter changes a reading between the Celsius, Fahrenheit and Kelvin scales. Celsius is used for weather and cooking in most countries including India, Fahrenheit in the United States, and Kelvin in science, where it starts from absolute zero.

Unlike length or weight, temperature scales don't just differ by a factor: Fahrenheit is also offset by 32 degrees, which is why mental conversion goes wrong. Enter a value and this converter applies the exact formulas, showing the result in all three scales, from a fever reading to an oven setting or a lab temperature.

°F = °C × 9 ÷ 5 + 32, and °C = (°F − 32) × 5 ÷ 9. Kelvin uses the same size of degree as Celsius but starts at absolute zero: K = °C + 273.15. Temperatures below absolute zero, −273.15 °C or −459.67 °F, don't exist, so the converter rejects them.

−40 is the one temperature that reads the same in Celsius and Fahrenheit. A quick mental estimate for Celsius to Fahrenheit is to double and add 30, which is close for everyday weather.