Millimeter (mm)
A millimeter is one thousandth of a meter — the metric workhorse for fine measurements and manufacturing tolerances.
Millimeters are used in engineering drawings, rainfall totals, and anywhere sub-centimeter precision matters.
Millimeter to Inch
Convert millimeter to inch instantly. Type in either field — results update live.
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Length Millimeter Inch
1 millimeter = 0.0393700787 inches
Unit
Unit
Conversion table
Selected mm values converted to in using the exact factor from this tool.
| mm | in |
|---|---|
| 0.01 | 0.0003937008 |
| 0.1 | 0.0039370079 |
| 1 | 0.0393700787 |
| 2 | 0.0787401575 |
| 3 | 0.1181102362 |
| 5 | 0.1968503937 |
| 10 | 0.3937007874 |
| 20 | 0.7874015748 |
| 50 | 1.968503937 |
| 100 | 3.937007874 |
| 1,000 | 39.3700787402 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 mm = 0.0393700787 in
1 in = 25.4 mm
To convert millimeter to inch, multiply by 0.0393700787.
To convert inch to millimeter, multiply by 25.4.
Example: convert 15 mm to in
15 × 0.0393700787 = 0.5905511811 in
About these units
Short background on the units used in this conversion.
Inch (in)
An inch is a unit in US customary and imperial measure, standardized internationally as exactly 2.54 centimeters.
Inches dominate screen sizes, lumber dimensions, and everyday measuring tapes in the United States.
Frequently asked questions
How many inches are in one millimeter?
One millimeter equals 0.0393700787 inches. Multiply your millimeters value by 0.0393700787 to convert to inches.
What is the conversion formula?
in = mm × 0.0393700787The reverse is
mm = in × 25.4, using the same exact factors as this converter.Is this Millimeter to Inch converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All millimeter conversions
Jump to any length conversion starting from millimeter — including the reverse direction and every other unit in our dataset.
inch (in) → millimeter (mm)
millimeter (mm) → kilometer (km)millimeter (mm) → meter (m)millimeter (mm) → decimeter (dm)millimeter (mm) → centimeter (cm)millimeter (mm) → micrometer (µm)millimeter (mm) → nanometer (nm)millimeter (mm) → mile (mi)millimeter (mm) → yard (yd)millimeter (mm) → foot (ft)millimeter (mm) → light year (ly)millimeter (mm) → exameter (Em)millimeter (mm) → petameter (Pm)millimeter (mm) → terameter (Tm)millimeter (mm) → gigameter (Gm)millimeter (mm) → megameter (Mm)millimeter (mm) → hectometer (hm)millimeter (mm) → dekameter (dam)millimeter (mm) → micron (µ)millimeter (mm) → picometer (pm)millimeter (mm) → femtometer (fm)millimeter (mm) → attometer (am)millimeter (mm) → megaparsec (Mpc)millimeter (mm) → kiloparsec (kpc)millimeter (mm) → parsec (pc)millimeter (mm) → astronomical unit (AU)millimeter (mm) → league (lea)millimeter (mm) → nautical league (uk)millimeter (mm) → nautical league (int.)millimeter (mm) → league (statute) (st.league)millimeter (mm) → nautical mile (uk) (NM-UK)millimeter (mm) → nautical mile (international) (nmi)millimeter (mm) → mile (statute)millimeter (mm) → mile (us survey)millimeter (mm) → mile (roman) (mi-Roman)millimeter (mm) → kiloyard (kyd)millimeter (mm) → furlong (fur)millimeter (mm) → furlong (us survey)millimeter (mm) → chain (ch)millimeter (mm) → chain (us survey)millimeter (mm) → ropemillimeter (mm) → rod (rd)millimeter (mm) → rod (us survey)millimeter (mm) → perchmillimeter (mm) → polemillimeter (mm) → fathom (fath)millimeter (mm) → fathom (us survey)millimeter (mm) → ellmillimeter (mm) → foot (us survey)millimeter (mm) → link (li)millimeter (mm) → link (us survey)millimeter (mm) → cubit (uk)millimeter (mm) → handmillimeter (mm) → span (cloth)millimeter (mm) → finger (cloth)millimeter (mm) → nail (cloth)millimeter (mm) → inch (us survey)millimeter (mm) → barleycornmillimeter (mm) → milmillimeter (mm) → microinch (µin)millimeter (mm) → angstrom (Å)millimeter (mm) → a.u. of lengthmillimeter (mm) → x-unit (X)millimeter (mm) → fermi (F)millimeter (mm) → arpentmillimeter (mm) → picamillimeter (mm) → point (pt)millimeter (mm) → twipmillimeter (mm) → alnmillimeter (mm) → famnmillimeter (mm) → caliber (cl)millimeter (mm) → centiinch (cin)millimeter (mm) → kenmillimeter (mm) → russian archin (archin)millimeter (mm) → roman actus (actus)millimeter (mm) → vara de tareamillimeter (mm) → vara conuqueramillimeter (mm) → vara castellanamillimeter (mm) → cubit (greek)millimeter (mm) → long reedmillimeter (mm) → reedmillimeter (mm) → long cubitmillimeter (mm) → handbreadthmillimeter (mm) → fingerbreadthmillimeter (mm) → planck lengthmillimeter (mm) → electron radius (classical) (re)millimeter (mm) → bohr radius (b)millimeter (mm) → earth's equatorial radius (R⊕eq)millimeter (mm) → earth's polar radius (R⊕pol)millimeter (mm) → earth's distance from sunmillimeter (mm) → sun's radius