0°C
32°F (freezing)
Temperature Converter
Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit instantly, in both directions — plus a full reference table for common temperatures.
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Convert Celsius ⇄ Fahrenheit
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Reference
Common Celsius to Fahrenheit Conversions
10°C
50°F
20°C
68°F (room temp)
25°C
77°F
30°C
86°F
37°C
98.6°F (body temp)
40°C
104°F
100°C
212°F (boiling)
FAQ
Frequently Asked Questions
°F = °C × 9/5 + 32. For example, 20°C × 9/5 + 32 = 68°F.
°C = (°F − 32) × 5/9. For example, (98.6°F − 32) × 5/9 = 37°C.
−40 degrees is the same value in both scales: −40°C = −40°F. This is the single point where the two linear scales intersect.
Fahrenheit was developed first (1724) and adopted widely in English-speaking countries. Most of the world switched to Celsius during 20th-century metrication efforts because it aligns with the metric system (0°C = freezing, 100°C = boiling), but the US retained Fahrenheit for everyday and weather use.
Normal human body temperature is commonly cited as 37°C (98.6°F), though it naturally varies slightly by individual, time of day, and measurement method, with a normal range roughly between 36.1°C and 37.2°C (97°F–99°F).
The Celsius to Fahrenheit Formula
To convert Celsius to Fahrenheit: °F = °C × 9/5 + 32. To go the other way, from Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Unlike weight or length, temperature scales have different zero points, so the conversion needs both a multiplication and an addition/subtraction step.
Full Reference Table
| Celsius | Fahrenheit |
|---|---|
| −40°C | −40°F |
| −20°C | −4°F |
| 0°C | 32°F |
| 10°C | 50°F |
| 20°C | 68°F |
| 30°C | 86°F |
| 37°C | 98.6°F |
| 50°C | 122°F |
| 100°C | 212°F |
Why 0°C and 100°C Are the Key Reference Points
The Celsius scale is defined so that 0°C is water's freezing point and 100°C is its boiling point at sea level — a clean, decimal-friendly design. Fahrenheit's reference points (32°F freezing, 212°F boiling) come from an older 18th-century scale based on a brine mixture and approximate body temperature, which is why the numbers look less "round."