Length & Distance
Browse Length & Distance conversions1 inch = 25.4 millimeter
How This Conversion Works
Inch and millimeter are both used for length & distance conversions. This page converts 1 inch into 25.4 millimeter using the formula shown below.
Use this result for quick checks, comparisons, and everyday reference. For work that depends on exact precision, review the rounding setting and the assumption note before using the number.
The precision controls let you switch between a shorter result, the standard readable result, and scientific notation when the value is very large or very small.
Unit Notes
- 1 inch (in) equals 0.0254 meter.
- 1 millimeter (mm) equals 0.001 meter.
Conversion Questions
How do you convert inch to millimeter?
This page converts inch to millimeter using this formula: (1 x 0.0254) / 0.001.
What is 1 inch in millimeter?
1 inch equals 25.4 millimeter.
How many decimals does this converter show?
Displayed to 10 decimal places, trimmed for readability. The precision buttons can also show a shorter result or scientific notation.
Equivalent Values
Nearby Values
- Formula
- (1 x 0.0254) / 0.001
- Rounding
- Displayed to 10 decimal places, trimmed for readability.
- Assumption
- Length and distance units use exact SI and international yard/pound definitions where applicable.