mm to inch Converter - Millimeter to Inch
Millimeter (mm) to Inch (in) (inch)
Direct answer
1 mm = 0.03937007874 inch
inch = mm × 0.03937007874
Converter
Conversion formula
inch = mm × 0.03937007874
mm = inch × 25.4
Example: 10 mm = 10 × 0.03937007874 = 0.393700787402 inch.
Common conversion table
| mm | inch |
|---|---|
| 1 mm | 0.03937007874 inch |
| 2 mm | 0.07874015748 inch |
| 5 mm | 0.196850393701 inch |
| 10 mm | 0.393700787402 inch |
| 20 mm | 0.787401574803 inch |
| 50 mm | 1.96850393701 inch |
| 100 mm | 3.93700787402 inch |
| 1,000 mm | 39.3700787402 inch |
Conversion derivation
Express both mm and inch in the same base unit m (meter), then cancel the shared base unit.
- 1
Rewrite mm in the base unit
- 2
Rewrite inch in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Explanation of mm to inch Conversion Factor
This conversion factor holds because both units are defined in terms of the meter, the base unit for length. By expressing each unit in meters and comparing their magnitudes, the factor is derived from their fixed definitions.
Definition
The millimeter (mm) is a metric unit equal to 0.001 meters. The inch (in) is an imperial unit defined as exactly 0.0254 meters.
Principle
The conversion factor is calculated by dividing the metric definition by the imperial definition. For the forward conversion, it is 0.001 meters per mm divided by 0.0254 meters per inch, which yields 0.03937007874 inches per mm. The reverse factor is its reciprocal, 25.4 mm per inch.
Assumptions
- The definitions of the millimeter and inch as provided are used.
- The base unit for comparison is the meter (m), as stated.
Cautions
- The derived factor is exact based on the definitions given; rounding may be needed for practical use.
- Always use the specified formula for conversions to maintain consistency.
FAQ
How many inch are in 1 mm?
1 mm = 0.03937007874 inch.
How many inch are in 10 mm?
10 mm = 0.393700787402 inch.
How many inch are in 100 mm?
100 mm = 3.93700787402 inch.
What is the formula to convert mm to inch?
Use inch = mm × 0.03937007874.
How many mm are in 1 inch?
1 inch = 25.4 mm.
What should I check when converting mm to inch?
Use the conversion factor and round the result to the precision required by your calculation.