Method and practical guide
Temperature formulas for Celsius, Fahrenheit, and Kelvin
Temperature scales have different zero points, so they cannot be converted with one multiplier. The tool applies the correct offset formula for each direction.
How it is calculated
Celsius to Fahrenheit: °F = °C × 9/5 + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Celsius to Kelvin: K = °C + 273.15.
Reference values
- 0 °C = 32 °F = 273.15 K
- 100 °C = 212 °F = 373.15 K
- Absolute zero = −273.15 °C = 0 K
Worked examples
- 20 °C = 68 °F
- 98.6 °F = 37 °C
- 300 K = 26.85 °C
Common uses
Weather, cooking, laboratory records, and imported equipment instructions frequently use different temperature scales.
Accuracy and scope
The page converts numbers and scales only. Medical, laboratory, or industrial control work should rely on calibrated instruments and professional requirements.