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A thousandth of an inch is a derived unit of length in an inch-based system of units. Equal to 0.001 inches, it is normally referred to as a thou, a thousandth, or (particularly in the United States) a mil.

The plural of thou is also thou (thus one hundredth of an inch is "10 thou"), while the plural of mil is mils (thus "10 mils"). Both words come from roots meaning "1000": "thou" from the English "thousand", which is from the Germanic root for 1000, and "mil" from the Romance root for 1000. The US Customary mil can be confused with the millimeter, which is the standard meaning for "mil" or "mils" (plural) in British English and European engineering circles. This can cause problems with spoken dimensions or with those who are not familiar with alternative uses of the term. One US mil is approximately 1/40th of a millimeter at 0.0254 mm, or 25.40 μm.

Symbol/abbreviation: th
Unit of: LENGTH
LENGTH's base unit: meters (SI Unit)
In relation to the base unit (meters), 1 Thou = 2.54E-5 meters.

Conversion table
1 Thou (th) to all length units

1 th= 0.013999999999967 agate [typography] (agate)
1 th= 4.2776930098454E-5 alens (aln)
1 th= 254000 angstroms (Å)
1 th= 1.6978851290562E-16 astronomical unit (au)
1 th= 25400000000000 attometers (am)
1 th= 0.003 barleycorns (bcorn)
1 th= 25400000 bicrons (μμ)
1 th= 3.1565656565657E-7 blocks (bl)
1 th= 479990.62695469 bohr radius (Bohr)
1 th= 1.3706140350877E-7 cable length uk (cbl[UK])
1 th= 1.1574074074074E-7 cable length us (cbl[US])
1 th= 0.1 calibers (cal)
1 th= 0.1 centiinch (cin)
1 th= 0.00254 centimeters (cm)
1 th= 1.2626262626263E-6 chains (ch)
1 th= 5.5555555555556E-5 cubits (cbt)
1 th= 2.54E-6 decameters (dam)
1 th= 0.000254 decimeters (dm)
1 th= 0.067558182529772 didot points (didot point)
1 th= 0.0013333333333333 digits (digit)
1 th= 6.35E-13 earth circumference (Ec)
1 th= 6.6076659330597E-14 earth to moon distance (EM d)
1 th= 2.2222222222222E-5 ells (eel)
1 th= 0.006022500060225 ems (EM)
1 th= 2.54E-23 exameters (Em)
1 th= 1.3888888888889E-5 fathoms (fath)
1 th= 8.3333333333333E-5 feet (ft)
1 th= 25400000000 femtometers (fm)
1 th= 25400000000 fermi (fermi)
1 th= 0.00022222222222222 finger cloth (finer)
1 th= 0.0011428571428571 fingerbreadth (fb)
1 th= 8.0865966252786E-5 fods (fod)
1 th= 2.7777777777778E-7 football field length [US] (fbf[US])
1 th= 1.2626262626263E-7 furlongs (fur)
1 th= 2.54E-14 gigameters (Gm)
1 th= 8.2467532467532E-7 greek plethron (pleth)
1 th= 1.372972972973E-7 greek stadion (std)
1 th= 0.00025 hands (h)
1 th= 2.54E-7 hectometers (hm)
1 th= 2.54 himetrics (hiMetric)
1 th= 1.0583333333333E-5 horse length (hl)
1 th= 1.3393206661861E-5 hvats (hvat)
1 th= 0.001 inches (in)
1 th= 2.54E-8 kilometers (km)
1 th= 8.2307193778354E-25 kiloparsecs (kpc)
1 th= 9.8069498069498E-19 light days (ld)
1 th= 2.354031510658E-17 light hours (lh)
1 th= 1.4118954974986E-15 light minutes (lmin)
1 th= 3.2685626045554E-20 light months (lm)
1 th= 8.4723148765844E-14 light seconds (ls)
1 th= 2.6847056336539E-21 light years (ly)
1 th= 0.012095238095238 lines (l)
1 th= 0.00012626237373725 links (li)
1 th= 6.6076659330597E-14 lunar distance (LD)
1 th= 2.54E-11 megameters (Mm)
1 th= 2.54E-5 meters (m)
1 th= 8.4666666666667E-5 metric foot (mf)
1 th= 1000 microinches (μin)
1 th= 25.4 micrometers (μm)
1 th= 25400000 micromicrons (μμm)
1 th= 1.5782828282828E-8 miles (mi)
1 th= 0.0254 millimeters (mm)
1 th= 1 mils (mil)
1 th= 2.54E-9 myriameters (Mym)
1 th= 0.00044444444444444 nails cloth (nail)
1 th= 25400 nanometers (nm)
1 th= 4.5716342692585E-9 nautical leagues (Nl)
1 th= 1.3714902807775E-8 nautical miles (NM)
1 th= 3.3333333333333E-5 paces (pace)
1 th= 0.00033333333333333 palms (palm)
1 th= 8.2315793951887E-22 parsecs (pc)
1 th= 5.0505050505051E-6 perch (perch)
1 th= 2.54E-20 petameters (Pm)
1 th= 0.0060000000047244 picas (p)
1 th= 25400000 picometers (pm)
1 th= 0.09600001209449 pixels (PX)
1 th= 1.5875E+30 planck length (pl)
1 th= 0.071999954645698 points (pt)
1 th= 5.0505050505051E-6 poles (pole)
1 th= 0.00057142857142857 rack unit (ru)
1 th= 0.0060000007559056 rems (rem)
1 th= 5.0505050505051E-6 rods (rd)
1 th= 7.1549295774648E-7 roman actus (actus)
1 th= 4.1666666666667E-6 ropes (rope)
1 th= 2.54E-9 scandinavian miles (mil[Scandinavian])
1 th= 1.6978609625668E-22 siriometer (sir)
1 th= 0.00011111111111111 spans (span)
1 th= 2.54E-17 terameters (Tm)
1 th= 1 thou (th)
1 th= 1.439990929191 twips (twip)
1 th= 2.933025404157E-5 varas [Argentina] (vr[Argentina])
1 th= 3.0302969566942E-5 varas [California] (vr[California])
1 th= 2.9398148148148E-5 varas [Latin America] (vr[Latin])
1 th= 3.030953915181E-5 varas [Mexico] (vr[Mexico])
1 th= 3.0386409857638E-5 varas [Spanish] (vr[Spanish])
1 th= 2.9999881890229E-5 varas [Texas] (vr[Texas])
1 th= 2.3809523809524E-8 versts (vst)
1 th= 253492002.02794 x unit (xu)
1 th= 2.7777777777778E-5 yards (yd)
1 th= 2.54E+19 yoctometers (ym)
1 th= 2.54E-29 yottameters (Ym)
1 th= 2.54E+16 zeptometers (zm)
1 th= 2.54E-26 zettameters (Zm)
1 th= 0.001 zolls (zoll)