| Celsius (C) | Fahrenheit (F) |
|---|
To convert Celsius to Fahrenheit, multiply by 9/5 (1.8) and add 32. The formula is:
The scales meet at 40: the only temperature where Celsius and Fahrenheit read the same value.
Key temperature landmarks in both scales:
To convert a temperature from Celsius to Fahrenheit, multiply the Celsius value by 9/5 (or 1.8) and then add 32. For example, 20C = (20 * 1.8) + 32 = 36 + 32 = 68F. Room temperature at 22C is about 72F. Normal body temperature of 37C equals exactly 98.6F.
To go the other way (Fahrenheit to Celsius), subtract 32 then multiply by 5/9. For instance, 68F = (68 - 32) * 5/9 = 36 * 5/9 = 20C.
Celsius is the international standard temperature scale used across Europe, Australia, Canada, and most of the world. Fahrenheit is used primarily in the United States (and in some weather contexts in the United Kingdom). You'll need this conversion when reading US weather forecasts, cooking with American recipes, understanding medical temperatures from US sources, or setting up thermostats in buildings with imperial systems.
Use the formula: F = (C * 9/5) + 32. Multiply the Celsius value by 1.8 and add 32. For example, 25C = (25 * 1.8) + 32 = 45 + 32 = 77F.
Normal body temperature is 37C, which equals exactly 98.6F. Using the formula: (37 * 9/5) + 32 = 66.6 + 32 = 98.6F. A fever is typically 38C (100.4F) or above.
Yes. -40C equals exactly -40F. This is the unique crossover point where the two temperature scales read the same value. It occurs because the offset (32) and the scale ratio (9/5) happen to align at that point.
100C (the boiling point of water at sea level) equals 212F. Using the formula: (100 * 9/5) + 32 = 180 + 32 = 212F. Similarly, 0C (the freezing point) equals 32F.
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