How to convert Celsius to Fahrenheit
Multiply the Celsius temperature by 9/5, then add 32. The formula is °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F (boiling point of water). 0°C = 32°F (freezing point). 37°C = 98.6°F (normal body temperature).
Common temperature reference points
−40°C = −40°F (the only point where both scales meet) | 0°C = 32°F (water freezes) | 20°C = 68°F (room temperature) | 37°C = 98.6°F (body temperature) | 100°C = 212°F (water boils at sea level).
Frequently Asked Questions
Why do two temperature scales exist?
The Fahrenheit scale was proposed by Daniel Gabriel Fahrenheit in 1724 and is still used primarily in the United States. The Celsius scale (formerly Centigrade) was introduced by Anders Celsius in 1742 and is used by most of the world and in all scientific contexts.
Is there a quick mental approximation?
A rough estimate: double the Celsius temperature and add 30. For example, 20°C ≈ (20 × 2) + 30 = 70°F (actual: 68°F). This is faster for mental math but less precise than the exact formula.