Temperature Converter
Instantly convert between Celsius, Fahrenheit, Kelvin and Rankine, and see the exact formula behind every result.
Convert Any Temperature
Type a temperature, choose your units, and get the converted value together with the equivalent in every other scale.
Temperature Converter
Celsius, Fahrenheit, Kelvin and Rankine in one place.
How it Works
Converting temperature in four steps
Enter a Temperature
Type the value you want to convert. Negative numbers and decimals are both accepted.
Pick Your Units
Choose the unit you are converting from and the unit you want. Use the swap button to reverse them.
Set the Precision
Select how many decimal places you need, from whole numbers up to four decimals.
Read the Result
See the converted value, the equivalent in all four scales, and the formula used.
Common Temperatures & Formulas
Familiar reference points in all three main scales, followed by the formulas for converting between them.
| Reference Point | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute zero | −273.15 | −459.67 | 0 |
| Scales meet | −40 | −40 | 233.15 |
| Water freezes | 0 | 32 | 273.15 |
| Comfortable room | 20 | 68 | 293.15 |
| Normal body temperature | 37 | 98.6 | 310.15 |
| Hot summer day | 40 | 104 | 313.15 |
| Water boils (sea level) | 100 | 212 | 373.15 |
| Moderate oven | 180 | 356 | 453.15 |
| Celsius to Fahrenheit | °F = (°C × 9/5) + 32 | ||
| Fahrenheit to Celsius | °C = (°F − 32) × 5/9 | ||
| Celsius to Kelvin | K = °C + 273.15 | ||
| Fahrenheit to Rankine | °R = °F + 459.67 | ||
Temperature Conversion FAQ
Answers to the most common questions about converting temperatures between Celsius, Fahrenheit and Kelvin.
Multiply the Celsius temperature by 9/5 (or 1.8) and add 32. The formula is °F = (°C × 9/5) + 32. For example, 25°C × 1.8 = 45, plus 32 = 77°F.
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. The formula is °C = (°F − 32) × 5/9. For example, 98.6°F − 32 = 66.6, × 5/9 = 37°C.
Add 273.15 to the Celsius temperature. The formula is K = °C + 273.15. Kelvin uses the same size of degree as Celsius, so only the starting point differs. Kelvin is written without a degree symbol.
Absolute zero is the lowest possible temperature, where particles have minimal thermal motion. It equals 0 K, −273.15°C or −459.67°F. Nothing can be cooled below this point, so this converter rejects values beneath it.
The two scales meet at −40. That means −40°C is exactly the same temperature as −40°F.