8 inches at a glance
- Centimeters
- 20.32 cm
- Millimeters
- 203.2 mm
- Meters
- 0.2032 m
- Feet & inches
- 8 in (under 1 ft)
- Feet (decimal)
- 0.6667 ft
- Nearest whole cm
- 20 cm
How to convert 8 inches to cm
cm = inches × 2.54
8 × 2.54 = 20.32 cm
8 × 2.54 = 20.32 cm
Because the inch is defined as exactly 2.54 cm, 20.32 cm is exact — no rounding involved. To do it in your head, split 2.54 into 2.5 + 0.04: 8 × 2.5 = 20 and 8 × 0.04 = 0.32, which add up to 20.32.
Fractions of an inch around 8 in
Tape measures between 8 and 9 in are marked in eighths. Each eighth adds 3.175 mm:
| Inches | Centimeters | Millimeters |
|---|---|---|
| 8 | 20.32 | 203.2 |
| 8 1/8 | 20.6375 | 206.375 |
| 8 1/4 | 20.955 | 209.55 |
| 8 3/8 | 21.2725 | 212.725 |
| 8 1/2 | 21.59 | 215.9 |
| 8 5/8 | 21.9075 | 219.075 |
| 8 3/4 | 22.225 | 222.25 |
| 8 7/8 | 22.5425 | 225.425 |
8 inches in real life
- In the kitchen. An 8 × 8 in square baking pan is about 20 × 20 cm — handy when a recipe from abroad lists pan sizes in centimeters.
- Pizza. A 8-inch pizza is 20.3 cm across with 50 in² (324 cm²) of pie.
Objects of a similar size
- 3% shorter than the short side of an A4 sheet, 21 cm (8.27 in).
- 6% shorter than the short side of US letter paper, 21.59 cm (8.5 in).
- 7% longer than a new, unsharpened pencil (about 7½ in), 19.05 cm (7.5 in).
Inches near 8 in
| Inches | Centimeters | Feet & inches / mm |
|---|---|---|
| 3 in | 7.62 cm | 76.2 mm |
| 4 in | 10.16 cm | 101.6 mm |
| 5 in | 12.7 cm | 127 mm |
| 6 in | 15.24 cm | 152.4 mm |
| 7 in | 17.78 cm | 177.8 mm |
| 8 in | 20.32 cm | 203.2 mm |
| 9 in | 22.86 cm | 228.6 mm |
| 10 in | 25.4 cm | 254 mm |
| 11 in | 27.94 cm | 279.4 mm |
| 12 in | 30.48 cm | 1 ft |
| 13 in | 33.02 cm | 1 ft 1 in |
Going the other way: 20 cm to inches is 7.87 in.
Frequently asked questions
How many cm is 8 inches?
8 inches is exactly 20.32 cm, because one inch is defined as 2.54 cm.
What is 8 inches in mm?
8 in = 203.2 mm (multiply by 25.4).
What is 8 ½ inches in cm?
8.5 in × 2.54 = 21.59 cm.
Is 8 inches the same as 20 cm?
Not quite: 8 in is 20.32 cm, so 20 cm is 3.2 mm too short — close enough for most everyday measuring.