Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Calculator
Warm - Room temperature
Reference Points
Conversion Formulas
- • °C = (°F - 32) × 5/9
- • °F = (°C × 9/5) + 32
- • K = °C + 273.15
How to Use
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Temperature Conversion Formulas
°F = (°C × 9/5) + 32 °C = (°F - 32) × 5/9 K = °C + 273.15
Celsius and Fahrenheit scales have different zero points and degree sizes. Kelvin starts at absolute zero.
Frequently Asked Questions
°F = (°C × 9/5) + 32. Example: 25°C = (25 × 1.8) + 32 = 77°F. Quick estimation: double Celsius and add 30. Water freezes at 0°C/32°F and boils at 100°C/212°F.
°C = (°F - 32) × 5/9. Example: 77°F = (77 - 32) × 0.556 = 25°C. Quick estimation: subtract 30 and halve. Room temperature is about 68-72°F or 20-22°C.
Kelvin is the SI unit of temperature, starting at absolute zero (-273.15°C). K = °C + 273.15. Used in science, astronomy, and color temperature (e.g., 5600K daylight). There are no negative Kelvin values.
-40 degrees is the same in both Celsius and Fahrenheit. This is the only point where the two scales intersect. You can verify: (-40 × 9/5) + 32 = -40.
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