21 Celsius to Fahrenheit
21 degrees Celsius equals
69.8°F
69.8 degrees Fahrenheit
21°C equals 69.8°F, comfortable indoor temperature. Most thermostats are set somewhere in this band, and it is the standard range for storing and testing many household products.
How to convert 21°C to °F
Formula
°F = °C × 9/5 + 32
Substituting 21°C
- 21 × 9/5 = 37.8
- 37.8 + 32 = 69.8
The two scales differ in both their zero point and their step size. A Fahrenheit degree is 5/9 the size of a Celsius degree, and the scales are offset by 32 degrees at the freezing point of water — which is why the conversion needs both a multiplication and an addition.
How 21°C compares
| Reference point | Temperature | Difference |
|---|---|---|
| Freezing point of water | 0°C / 32°F | 21°C (37.8°F) warmer |
| Room temperature | 21°C / 69.8°F | same temperature |
| Body temperature | 37°C / 98.6°F | 16°C (28.8°F) colder |
| Boiling point of water | 100°C / 212°F | 79°C (142.2°F) colder |