Calculator guide
Convert temperatures among Celsius, Fahrenheit, and Kelvin.
Formula or method
F = 9C/5 + 32; C = 5(F−32)/9; K = C + 273.15.
How to use this calculator
- Select the source temperature scale.
- Select the destination scale.
- Enter the temperature and check the resulting unit.
Worked example
25°C converts to 25×9/5+32=77°F and 298.15 K.
Understanding the result
Temperature intervals and absolute temperatures are related but have different zero points; Kelvin does not use a degree symbol.
Limitations and assumptions
- These formulas convert temperature readings, not heat energy.
- Rounding can matter in scientific or engineering work.
Frequently asked questions
Can Kelvin be negative?
Ordinary thermodynamic temperatures cannot fall below absolute zero.
Why add 32?
The Fahrenheit and Celsius scales have different zero points.
How do I convert a temperature difference?
A 1°C interval equals a 1 K interval and a 1.8°F interval.
Sources
Educational information only; verify important decisions with a qualified professional.