Temperature Converter
Enter a temperature in any scale and see the other three.
Your numbers
Your results
Celsius
Celsius
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Fahrenheit
—
Kelvin
—
Rankine
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Temperature Converter by TheCalcTools
How the Temperature Converter works
Enter the temperature and choose its scale.
The value is first converted to kelvin, the absolute scale.
Kelvin is then converted to each other scale. Values below absolute zero are rejected.
The formula
°F = °C × 9/5 + 32K = °C + 273.15
Worked example
Using the default values shown in the calculator:
| Temperature | 25 |
|---|---|
| From | Celsius (°C) |
- 25°C = 25 × 9/5 + 32 = 77.00°F.
- 25°C = 25 + 273.15 = 298.15 K.
Result:
| Celsius | 25.00 |
|---|---|
| Fahrenheit | 77.00 |
| Kelvin | 298.15 |
| Rankine | 536.67 |
Frequently asked questions
At what temperature are Celsius and Fahrenheit equal?
At −40°. It is the only point where the two scales give the same number.
What is absolute zero?
0 K, −273.15°C or −459.67°F, the lowest possible temperature where particles have minimal thermal motion.
Sources and further reading
- NIST: Guide for the Use of the International System of Units (SI)
- Wikipedia: Conversion of scales of temperature
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.