21 cm to inches: 21 centimeters in inches
21 cm is about 8.27 in.
21 cm in inches
8.27 in
How it is calculated
Formula: inches = cm ÷ 2.54
- An inch is exactly 2.54 cm, so divide: 21 ÷ 2.54 = 8.2677 in.
What this means
- 21 cm is the width of an A4 sheet (21 × 29.7 cm); US Letter paper is 8.5 in (21.59 cm) wide.
- On a tape measure marked in sixteenths, 8.268 in is closest to 8 1/4 in.
- Mental check: 1 cm ≈ 0.4 in, so 21 cm ≈ 8.4 in (exact: 8.27 in).
Try other numbers
The full inches to cm converter, filled in with these values.
cm
21 cm in inches
8.27 in
- Centimeters
- 21 cm
- Inches
- 8.268 in
- Feet + inches
- 0 ft 8.3 in
- Feet (decimal)
- 0.689 ft
- Meters
- 0.21 m
How this was calculated
- An inch is exactly 2.54 cm, so divide: 21 ÷ 2.54 = 8.2677 in.
| in | cm | in | cm | in | cm |
|---|---|---|---|---|---|
| 1 | 2.54 | 13 | 33.02 | 30 | 76.2 |
| 2 | 5.08 | 14 | 35.56 | 36 | 91.44 |
| 3 | 7.62 | 15 | 38.1 | 42 | 106.68 |
| 4 | 10.16 | 16 | 40.64 | 48 | 121.92 |
| 5 | 12.7 | 17 | 43.18 | 54 | 137.16 |
| 6 | 15.24 | 18 | 45.72 | 60 | 152.4 |
| 7 | 17.78 | 19 | 48.26 | 66 | 167.64 |
| 8 | 20.32 | 20 | 50.8 | 72 | 182.88 |
| 9 | 22.86 | 21 | 53.34 | 78 | 198.12 |
| 10 | 25.4 | 22 | 55.88 | 84 | 213.36 |
| 11 | 27.94 | 23 | 58.42 | 90 | 228.6 |
| 12 | 30.48 | 24 | 60.96 | 96 | 243.84 |
| cm | in | cm | in | cm | in |
|---|---|---|---|---|---|
| 1 | 0.39 | 15 | 5.91 | 70 | 27.56 |
| 2 | 0.79 | 20 | 7.87 | 80 | 31.5 |
| 3 | 1.18 | 25 | 9.84 | 90 | 35.43 |
| 4 | 1.57 | 30 | 11.81 | 100 | 39.37 |
| 5 | 1.97 | 35 | 13.78 | 110 | 43.31 |
| 6 | 2.36 | 40 | 15.75 | 120 | 47.24 |
| 7 | 2.76 | 45 | 17.72 | 130 | 51.18 |
| 8 | 3.15 | 50 | 19.69 | 140 | 55.12 |
| 9 | 3.54 | 55 | 21.65 | 150 | 59.06 |
| 10 | 3.94 | 60 | 23.62 | 160 | 62.99 |