Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly with formulas and reference points.
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Three scales dominate: Celsius (worldwide), Fahrenheit (US), and Kelvin (science). Understanding conversion is essential for cooking, science, and travel.
The Three Scales
Celsius: 0°=freeze, 100°=boil. Fahrenheit: 32°=freeze, 212°=boil. Kelvin: starts at absolute zero (−273.15°C).
Absolute Zero
0 K (−273.15°C) is the theoretical lowest temperature. Kelvin is used in physics because it has no negative values.
How to Use This Calculator
- Select 'Temperature'
Open the Unit Converter and choose Temperature.
- Select the source scale
Choose Celsius, Fahrenheit, or Kelvin.
- Enter the value
Type the temperature.
- Select the target scale
Choose the scale you need.
Applications
Cooking and Baking
Oven temperatures vary by country. 350°F = 175°C. Correct conversion is critical for baking.
Weather and Travel
30°C = 86°F (hot day). 0°C = 32°F (freezing). Converting helps when travelling.
Science and Engineering
Room temperature (22°C) = 295.15 K. Thermodynamic equations use Kelvin.
Frequently Asked Questions
How do you convert °C to °F?
Multiply by 9/5 then add 32. For example, 25°C × 9/5 + 32 = 77°F.
What temperature is the same in °C and °F?
−40°C = −40°F. The only point where both scales intersect.
Why does the US use Fahrenheit?
Historical momentum from British colonial influence. Never switched to Celsius.