1 Inches to cm
1 in = 2.54 cm
1 inch equals 2.54 centimeters.
How to convert 1 in to cm
Use the formula cm = in × 2.54:
cm = 1 × 2.54cm = 2.54
So 1 in = 2.54 cm.
Rounded values and quick estimate
- Rounded to a whole number: 3 cm
- Rounded to one decimal place: 2.5 cm
- Conversion factor: 1 inch = 2.54 centimeters
Quick mental estimate: multiply by 2.5. For 1 in that gives about 2.5 cm — off by 0.04 cm (1.6%). Use the exact formula when precision matters.
1 Inches in other units
- Centimeters
- 2.54 cm
- Millimeters
- 25.4 mm
- Meters
- 0.0254 m
- Kilometers
- 0.000025 km
- Feet
- 0.0833 ft
- Yards
- 0.0278 yd
- Miles
- 0.000016 mi
- Micrometers
- 25400 µm
- Hands
- 0.25 hh
- Nautical miles
- 0.000014 nmi
- Mils (thou)
- 1000 mil
1 in and nearby values
About inches and centimeters
An inch is defined as exactly 2.54 centimeters. There are 12 inches in a foot; inches are used in the US for screens, heights and small lengths.
A centimeter is one hundredth of a meter. It is the everyday metric unit for body height, clothing and short lengths.
Related conversions
Frequently asked questions
What is 1 Inches in cm?
1 inch is 2.54 centimeters (1 in = 2.54 cm).
How do you convert 1 in to cm?
Apply cm = in × 2.54: cm = 1 × 2.54, cm = 2.54.
How many inches is 2.54 cm?
2.54 cm is about 1 inch.