Celsius to Fahrenheit Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine
| Reference | °C | °F | K |
|---|---|---|---|
| Absolute Zero | -273.15° | -459.67° | 0 |
| Dry Ice | -78.5° | -109.3° | 194.65 |
| Water Freezing | 0° | 32° | 273.15 |
| Room Temperature | 20° | 68° | 293.15 |
| Body Temperature | 37° | 98.6° | 310.15 |
| Water Boiling | 100° | 212° | 373.15 |
How to Convert Celsius to Fahrenheit
The formula is: °F = (°C × 9/5) + 32. For the reverse, °C = (°F − 32) × 5/9. This tool also shows Kelvin (K = °C + 273.15) and Rankine (°R = °F + 459.67). Click any row in the reference table to populate the inputs automatically.
Frequently Asked Questions
What temperature is the same in Celsius and Fahrenheit?
-40°. At -40°C = -40°F, the two scales intersect. This is the only point where both read the same number.
What is absolute zero?
Absolute zero (0 Kelvin = -273.15°C = -459.67°F) is the lowest theoretically possible temperature, where all thermal motion stops.
What is normal body temperature in Fahrenheit?
37°C = 98.6°F. In practice, normal body temperature ranges from about 36.1°C (97°F) to 37.2°C (99°F).
Why does the US use Fahrenheit?
The US retained the Fahrenheit scale historically. Most other countries adopted Celsius as part of the metric system in the 20th century.
What is a comfortable room temperature?
Most people find 20–22°C (68–72°F) comfortable. The WHO recommends a minimum of 18°C (64°F) for indoor living spaces.