Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with ease.
Thermal Dynamics and Measurement
Temperature is a physical quantity that expresses the hotness or coldness of a substance. It is the manifestation of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy, when a body is in contact with another that is colder.
While Celsius and Fahrenheit are common in daily life, Kelvin is the absolute scale used by scientists to study everything from the birth of stars to the behavior of quantum particles at absolute zero.
Key Temperature Milestones
Frequently Asked Questions
Why does the US use Fahrenheit?
Daniel Gabriel Fahrenheit developed his scale in 1724. It was the standard for the British Empire for centuries. While the UK switched to Celsius in the mid-20th century, the US maintained Fahrenheit for its finer precision in weather reporting.
What is Kelvin used for?
Kelvin is an absolute scale where 0 K is the point where all molecular motion stops. It is used in physics and chemistry because it simplifies mathematical equations involving thermodynamics.
How to convert Celsius to Fahrenheit in your head?
A quick estimate: Double the Celsius number and add 30. (e.g., 20°C: 20x2=40, 40+30=70°F. The actual value is 68°F).
Is there a point where Celsius and Fahrenheit are equal?
Yes! At exactly **-40 degrees**, both scales show the same value: -40°C = -40°F.
Conversion Formulas
C to F
°F = (°C × 9/5) + 32
F to C
°C = (°F - 32) × 5/9
C to K
K = °C + 273.15