8 millimeters to inches
0.31 in
8 mm = 0.31 in.
inches
0.31in
8 mm = 0.31 in
In short
How many inches is 8 millimeters?
8 mm = 0.31 in. 1 millimeter = 0.039370 inches, so the working is 8 × 0.039370 = 0.31.
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 millimeter = 0.039370 inches 8 × 0.039370 = 0.31
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 | 0 | −0.31496 |
| 1 decimal | 0.3 | −0.01496 |
| 2 decimals | 0.31 | −0.00496 |
Round trip: take 0.31 in back the other way and you land on 7.8740 mm — a drift of 0.1260 mm. That gap is the rounding, not the conversion.
Frequently asked questions
What is 8 millimeters in inches?
8 millimeters is 0.31 inches. 1 millimeter = 0.039370 inches, so the working is 8 × 0.039370 = 0.31.
How accurate is 0.31 in?
Rounding to 0.31 in and converting straight back gives 7.8740 mm, a drift of 0.1260 mm 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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