Celsius to Fahrenheit

0°C equals exactly 32°F — the freezing point of pure water at standard atmospheric pressure. This is one of the two fixed reference points used to define the Fahrenheit scale. Formula: (0 × 9/5) + 32 = 32°F. When outdoor temperatures reach 0°C (32°F), expect ice and frost on roads and surfaces.

20°C equals 68°F. This is widely considered a mild, comfortable temperature — typical of a pleasant spring or autumn day in temperate climates. Many countries set indoor thermostats to 20–22°C (68–72°F) as the ideal room temperature. Formula: (20 × 9/5) + 32 = 68°F.

37°C equals 98.6°F — the traditional average human body temperature. A fever is typically defined as above 38°C (100.4°F). Formula: (37 × 9/5) + 32 = 98.6°F. Note: normal body temperature can range from 36.1–37.2°C (97–99°F) depending on the person, time of day, and measurement method.

100°C equals exactly 212°F — the boiling point of pure water at sea level (1 atm). This is the upper fixed reference point of the Celsius scale. Formula: (100 × 9/5) + 32 = 212°F. At high altitude, water boils at lower temperatures because atmospheric pressure is reduced — for example, at 2,000 m (6,600 ft) water boils at about 93°C (199°F).