°C · °F · K · °R
Free Temperature Converter
Convert temperature units instantly — Celsius, Fahrenheit, Kelvin, and Rankine. Type into any field and all others update. Free, symmetrical, no sign-up.
Why symmetrical conversion?
How This Converter Works
Temperature scales differ in their zero points and intervals. Celsius and Fahrenheit are the most common everyday scales, while Kelvin is essential for scientific work. Our symmetrical converter updates all four scales simultaneously — type in any field.
Quick reference
Common Conversions
| Celsius (°C) | Fahrenheit (°F) | Kelvin (K) | Context |
|---|---|---|---|
| -40°C | -40°F | 233.15 K | Parity point — both scales are equal |
| 0°C | 32°F | 273.15 K | Freezing point of water |
| 20°C | 68°F | 293.15 K | Standard room temperature |
| 37°C | 98.6°F | 310.15 K | Normal human body temperature |
| 100°C | 212°F | 373.15 K | Boiling point of water |
| 180°C | 356°F | 453.15 K | Standard oven baking temperature |
FAQ
Frequently Asked Questions
1How do I convert Celsius to Fahrenheit?
Multiply by 9/5 then add 32. So 20°C = (20 × 9/5) + 32 = 68°F. Or use the converter above — type in any field and all others update instantly.
2What temperature is the same in Celsius and Fahrenheit?
-40 degrees. At −40°C = −40°F, both scales intersect. This is the only point where the two scales are equal.
3What is absolute zero in Celsius and Fahrenheit?
Absolute zero is 0 Kelvin, which equals −273.15°C or −459.67°F. It is the theoretical lowest possible temperature.
4Why does the US use Fahrenheit instead of Celsius?
The US adopted the Fahrenheit scale in the 18th century before the metric system was established. Despite several attempts to switch, the transition never occurred due to industrial and cultural inertia.
Related converters