Inch (in)
Exactly 0.0254 meters (international inch).
What is an inch?
- Symbol
- in
- Quantity
- Length
- Unit system
- US customary
- Definition
- Exactly 0.0254 meters (international inch).
- Exact
- Yes, the value is exact by definition
- Source
- International yard and pound agreement (1959)
Common applications
Used in the United States for everyday lengths, and worldwide for screen sizes, wheel rims, pipe sizes and fasteners.
Inch in other length units
- 1 in = 25400000 nmNanometer
- 1 in = 25400 µmMicrometer
- 1 in = 25.4 mmInch to Millimeter converter
- 1 in = 2.54 cmInch to Centimeter converter
- 1 in = 0.0254 mInch to Meter converter
- 1 in = 0.0000254 kmKilometer
- 1 in = 254000000 ÅÅngström
- 1 in = 1000 milMil (thou)
- 1 in ≈ 0.08333333333 ftInch to Foot converter
- 1 in ≈ 0.02777777778 ydYard
- 1 in ≈ 0.00001578282828 miMile
- 1 in ≈ 0.00001371490281 nmiNautical mile
Inch quick reference
| Inch | Millimeter | Centimeter | Meter |
|---|---|---|---|
| 1 in | = 25.4 mm | = 2.54 cm | = 0.0254 m |
| 10 in | = 254 mm | = 25.4 cm | = 0.254 m |
| 100 in | = 2540 mm | = 254 cm | = 2.54 m |
| 1000 in | = 25400 mm | = 2540 cm | = 25.4 m |
Where the inch fits
The next smaller length unit is the centimeter (cm). 1 in = 2.54 cm, and 1 cm ≈ 0.3937007874 in.
The next larger length unit is the foot (ft). 1 in ≈ 0.08333333333 ft, and 1 ft = 12 in.
Frequently asked questions
- How many millimeters are in one inch?
- One inch = 25.4 mm (millimeters).
- How many centimeters are in one inch?
- One inch = 2.54 cm (centimeters).
- How many meters are in one inch?
- One inch = 0.0254 m (meters).