mm to inches
Precise millimeter to inch converter for engineers, woodworkers & sellers
“mm to in” and “mm to inch” mean the same thing as “mm to inches” — they convert millimeters into inch measurements.
Decimals
Rounding
Fraction
Quick MM to Inches Conversion Presets & History
Presets & Favorites
Quickly apply common mm to inches setups (woodworking fractions, engineering precision, common sizes).
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Editorial conversion notes
How to use this conversion accurately
Formula
1 inch = 25.4 millimeters exactly.
Rounding, tolerance, and substitution
The conversion factor is exact. Decimal and fraction displays may be rounded; a nearby fraction is a reading aid, not an exact substitute. Keep more digits when fit or tolerance matters.
Practical use cases
- Convert a measured millimeter value to decimal and fractional inches for workshop notes, product dimensions, or drawing review.
- Reverse the direction for inch-to-millimeter checks and keep the selected precision with the shared result.
Comparisons and examples
- 10 mm ÷ 25.4 = 0.3937007874 inches; to four decimals this is 0.3937 inches.
- 25.4 mm = 1 inch exactly; 12.7 mm = 1/2 inch exactly.
Editorial value
Explain what the precision, rounding mode, and fraction denominator change, then direct users to the chart, fraction, worksheet, and task-specific tools instead of repeating a generic result.