How this calculator works
Temperature scales have different zero points. Celsius and Kelvin increments are equal; a Celsius increment equals 1.8 Fahrenheit increments. Values below absolute zero (−273.15 °C, −459.67 °F, 0 K) are rejected.
The formula
Kelvin = °C + 273.15
Kelvin = (°F + 459.67) × 5/9
Target = (Kelvin − target offset) / target factorA quick example
0 °C = 32 °F; 100 °C = 373.15 K; −40 °C = −40 °F.
How to use this calculator
- Enter a value using a decimal point.
- Choose the source and target units.
- Read the live result or swap units to reverse the direction.
A few common questions
Which convention does this converter use?
Temperature scales have different zero points. Celsius and Kelvin increments are equal; a Celsius increment equals 1.8 Fahrenheit increments. Values below absolute zero (−273.15 °C, −459.67 °F, 0 K) are rejected.
Can I reverse the conversion?
Yes. Swap exchanges the units, keeps your input amount and calculates again.
Why is the displayed result rounded?
The calculation uses the full stored factor. Results show up to six decimal places, with scientific notation for very small or large amounts.
Reference: NIST conversion factors