21 °C = 69.8 °F
21 degrees Celsius is 69.8 degrees Fahrenheit exactly.
- Exact
- 69.8 °F
- Rounded
- 69.8 °F
- Formula
- 21 × 9/5 + 32
Convert any other temperature
Type in either box; the other follows, and the scale moves with it. Works for decimals and, for temperatures, numbers below zero.
Around 21 °C
Celsius to Fahrenheit for the whole numbers either side of 21, rounded to one decimal place. Each row opens its own page.
| Degrees Celsius | Degrees Fahrenheit |
|---|---|
| 16 °C | 60.8 °F |
| 17 °C | 62.6 °F |
| 18 °C | 64.4 °F |
| 19 °C | 66.2 °F |
| 20 °C | 68 °F |
| 21 °C | 69.8 °F |
| 22 °C | 71.6 °F |
| 23 °C | 73.4 °F |
| 24 °C | 75.2 °F |
| 25 °C | 77 °F |
| 26 °C | 78.8 °F |
How to convert Celsius to Fahrenheit
The formula
°F = °C × 9/5 + 32. The two scales start from different zero points, so there is a subtraction as well as a multiplication.
Worked through for 21
Multiply by 9/5 (1.8): 21 × 1.8 = 37.8. Add 32: 37.8 + 32 = 69.8. Rounded, that is 69.8 °F.
In your head
Double it and add 30: 20 °C → 40 + 30 = 70 °F (close enough for weather).
Questions
What is 21 °C in Fahrenheit?
21 degrees Celsius is 69.8 degrees Fahrenheit, or 69.8 °F rounded to one decimal place.
How do you convert degrees Celsius to degrees Fahrenheit?
Use 21 × 9/5 + 32, which gives 69.8. For a quick estimate: Double it and add 30: 20 °C → 40 + 30 = 70 °F (close enough for weather).
Is 21 °C hot or cold?
21 °C is 69.8 °F: mild, around comfortable room temperature.
What is 21 °F in Celsius?
Going the other way, 21 °F is -6.1 °C. The reverse conversion has its own page and converter.
Is the answer exact?
Yes. 21 °C converts to exactly 69.8 °F; the rounded figure is only for convenience.