4 inches to centimeters
10.16 cm
4 in = 10.16 cm.
centimeters
10.16cm
4 in = 10.16 cm
The short answer
How many centimeters is 4 inches?
4 in = 10.16 cm. 1 inch = 2.540000 centimeters, so the working is 4 × 2.540000 = 10.16.
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 inch = 2.540000 centimeters 4 × 2.540000 = 10.16
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 (cm) | Off by |
|---|---|---|
| Whole number | 10 | −0.16000 |
| 1 decimal | 10.2 | +0.04000 |
| 2 decimals | 10.16 | exact |
Round trip: take 10.16 cm back the other way and you land on 4.0000 in — a drift of 0.0000 in. That gap is the rounding, not the conversion.
What 4 in looks like
3.50 in
A nominal 2x4 stud actually measures 1.5 by 3.5 in once it has been dried and planed.
Frequently asked questions
What is 4 inches in centimeters?
4 inches is 10.16 centimeters. 1 inch = 2.540000 centimeters, so the working is 4 × 2.540000 = 10.16.
How accurate is 10.16 cm?
Rounding to 10.16 cm and converting straight back gives 4.0000 in, a drift of 0.0000 in from the 4 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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