8 centimeters to inches
3.15 in
8 cm = 3.15 in.
inches
3.15in
8 cm = 3.15 in
The short answer
How many inches is 8 centimeters?
8 cm = 3.15 in. 1 centimeter = 0.393701 inches, so the working is 8 × 0.393701 = 3.15.
To the nearest 1/8 that is 3 1/8 in.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 centimeter = 0.393701 inches 8 × 0.393701 = 3.15
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (in) | Off by |
|---|---|---|
| Whole number | 3 | −0.14961 |
| 1 decimal | 3.1 | −0.04961 |
| 2 decimals | 3.15 | +0.00039 |
Round trip: take 3.15 in back the other way and you land on 8.0010 cm — a drift of 0.0010 cm. That gap is the rounding, not the conversion.
What 8 cm looks like
8.60 cm
Bank cards and driving licences follow ISO/IEC 7810 ID-1, which fixes them at 85.60 mm by 53.98 mm.
Frequently asked questions
What is 8 centimeters in inches?
8 centimeters is 3.15 inches. 1 centimeter = 0.393701 inches, so the working is 8 × 0.393701 = 3.15.
What is 8 centimeters as a fraction?
To the nearest 1/8, 8 centimeters is 3 1/8 in. That is 0.0246 in under the exact value — well inside what a tape measure can resolve.
How accurate is 3.15 in?
Rounding to 3.15 in and converting straight back gives 8.0010 cm, a drift of 0.0010 cm from the 8 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
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