Inch (in)
Exactly 25.4 millimeters; the base small unit of US customary and Imperial length.
Result
1 inch = 25.4 millimeters
Inch at a glance
| Unit name | Inch (plural: inches) |
|---|---|
| Symbol | in |
| Quantity measured | Length |
| Measurement system | US customary |
| Also known as | in, ", inch, inches |
| Definition exact? | Yes — exact by definition |
1 inch in other length units
| Unit | 1 in equals |
|---|---|
| Nanometer | 25,400,000 nm |
| Micrometer | 25,400 µm |
| Millimeter | 25.4 mm |
| Centimeter | 2.54 cm |
| Decimeter | 0.254 dm |
| Meter | 0.0254 m |
| Kilometer | 0.0000254 km |
| Foot | 0.083333333 ft |
| Yard | 0.027777778 yd |
| Mile | 0.000015783 mi |
| Nautical mile | 0.000013715 nmi |
| Angstrom | 254,000,000 Å |
| Mil | 1,000 mil |
| Fathom | 0.013888889 ftm |
| Rod | 0.005050505 rd |
| Chain | 0.001262626 ch |
| Furlong | 0.000126263 fur |
| League | 0.000005261 lea |
| Astronomical unit | 1.69788513 × 10⁻¹³ au |
| Light-year | 2.68478212 × 10⁻¹⁸ ly |
| Parsec | 8.2315794 × 10⁻¹⁹ pc |
Popular inch conversions
Frequently asked questions
- What is a inch?
- Exactly 25.4 millimeters; the base small unit of US customary and Imperial length.
- What is the symbol for the inch?
- The symbol for the inch is in. It measures length.
- How many millimeters are in a inch?
- 1 inch = 25.4 millimeters.
- How many centimeters are in a inch?
- 1 inch = 2.54 centimeters.
- How many meters are in a inch?
- 1 inch = 0.0254 meters.