1 inches to centimeters
2.54 cm
1 in = 2.54 cm.
centimeters
2.54cm
1 in = 2.54 cm
The short answer
How many centimeters is 1 inches?
1 in = 2.54 cm. 1 inch = 2.540000 centimeters, so the working is 1 × 2.540000 = 2.54.
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 1 × 2.540000 = 2.54
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 | 3 | +0.46000 |
| 1 decimal | 2.5 | −0.04000 |
| 2 decimals | 2.54 | exact |
Round trip: take 2.54 cm back the other way and you land on 1.0000 in — a drift of 0.0000 in. That gap is the rounding, not the conversion.
What 1 in looks like
1.68 in
The R&A and USGA set the minimum diameter of a golf ball at 1.68 in.
Frequently asked questions
What is 1 inches in centimeters?
1 inches is 2.54 centimeters. 1 inch = 2.540000 centimeters, so the working is 1 × 2.540000 = 2.54.
How accurate is 2.54 cm?
Rounding to 2.54 cm and converting straight back gives 1.0000 in, a drift of 0.0000 in from the 1 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
Inches to Cm Converter
Convert inches to centimeters — furniture, parcels, and clothing measurements.
Open the inches to cm converter →