21 cm = 8.27 in
21 centimeters is 8.267717 inches, to six decimal places.
- Precise
- 8.267717 in
- Rounded
- 8.27 in
- Formula
- 21 ÷ 2.54
Convert any other length
Type in either box; the other follows, and the scale moves with it. Works for decimals and, for temperatures, numbers below zero.
Around 21 cm
Centimeters to Inches for the whole numbers either side of 21, rounded to two decimal places. Each row opens its own page.
| Centimeters | Inches |
|---|---|
| 16 cm | 6.3 in |
| 17 cm | 6.69 in |
| 18 cm | 7.09 in |
| 19 cm | 7.48 in |
| 20 cm | 7.87 in |
| 21 cm | 8.27 in |
| 22 cm | 8.66 in |
| 23 cm | 9.06 in |
| 24 cm | 9.45 in |
| 25 cm | 9.84 in |
| 26 cm | 10.24 in |
How to convert centimeters to inches
The formula
in = cm ÷ 2.54. Dividing by 2.54 is the same as multiplying by 0.39370079.
Worked through for 21
Divide 21 by 2.54. The result is 8.267717 in to six places. Rounded, that is 8.27 in.
In your head
Multiply by 4 and divide by 10: 15 cm → 60 ÷ 10 = 6 in (a little high).
Questions
How many inches is 21 cm?
21 centimeters is 8.267717 inches to six decimal places, or 8.27 in rounded to two decimal places.
How do you convert centimeters to inches?
Use 21 ÷ 2.54, which gives 8.267717. For a quick estimate: Multiply by 4 and divide by 10: 15 cm → 60 ÷ 10 = 6 in (a little high).
What is 21 cm in feet and inches?
21 cm is 8.27 inches, which is less than a foot (12 inches, or 30.48 cm).
What is 21 in in centimeters?
Going the other way, 21 in is 53.34 cm. The reverse conversion has its own page and converter.
Is the answer exact?
The exact answer has endless decimals, so it is shown to six places (8.267717). The rounded figure, 8.27, is accurate enough for everyday use, shipping and recipes.