Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine temperature scales instantly. Includes reference chart for common temperatures.
Temperature Reference
| Point | °C | °F | K |
|---|---|---|---|
| Absolute Zero | -273.15 | -459.67 | 0 |
| Water Freezing | 0 | 32 | 273.15 |
| Body Temperature | 37 | 98.6 | 310.15 |
| Water Boiling | 100 | 212 | 373.15 |
| Sun Surface | 5,505 | 9,941 | 5,778 |
About this calculator
Enter a temperature, choose its scale and the page shows it in Celsius, Fahrenheit, Kelvin and Rankine side by side. A reference chart underneath lists absolute zero, water freezing, room temperature, body temperature and boiling in all four scales.
The default of 100 °C shows boiling water as 212 °F, 373.15 K and 671.67 °R.
How to use it
- Type the Value.
- Choose the scale in From.
- Read the four results and the reference chart.
Formulas
°F = °C × 9/5 + 32, °C = (°F − 32) × 5/9, K = °C + 273.15 and °R = (°C + 273.15) × 9/5 = °F + 459.67. Temperature scales have different zero points, so unlike length you cannot just multiply. The two scales agree at −40, where −40 °C equals −40 °F.
Worked example
Reference points
| Water freezes | 0 °C = 32 °F = 273.15 K |
| Body temperature | 37 °C = 98.6 °F = 310.15 K |
| Water boils (sea level) | 100 °C = 212 °F = 373.15 K |
| Moderate oven | 180 °C = 356 °F |
| Absolute zero | −273.15 °C = −459.67 °F = 0 K |
Tips and common mistakes
- Quick estimate from °C to °F: double it and add 30. It is close within the normal range.
- Oven recipes: 180 °C is about 350 °F, 200 °C about 400 °F.
- Kelvin has no degree symbol and never goes below zero.
- Fever in an adult starts around 38 °C (100.4 °F).
- Use the −40 crossover to sanity-check: both scales read the same.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32.
How do I convert Fahrenheit to Celsius?
Subtract 32 and multiply by 5/9.
What is 37 °C in Fahrenheit?
98.6 °F.
What is absolute zero?
0 K, or −273.15 °C, the lowest possible temperature.
At what temperature are Celsius and Fahrenheit equal?
−40.
What is Rankine?
An absolute scale that uses Fahrenheit-sized degrees, with 0 °R at absolute zero.