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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= 0.014 agate [typography] (agate)
1 th= 4.27769300985E-5 alens (aln)
1 th= 254000 angstroms (Å)
1 th= 1.69788512906E-16 astronomical unit (au)
1 th= 2.54E+13 attometers (am)
1 th= 2.15053763441E-7 barleycorns (bcorn)
1 th= 25400000 bicrons (μμ)
1 th= 479990.626955 bohr radius (Bohr)
1 th= 1.37061403509E-7 cable length uk (cbl[UK])
1 th= 1.15740740741E-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= 1.26262626263E-6 chains (ch)
1 th= 5.55555555556E-5 cubits (cbt)
1 th= 2.54E-6 decameters (dam)
1 th= 0.000254 decimeters (dm)
1 th= 0.0675581825298 didot points (didot point)
1 th= 0.00133333333333 digits (digit)
1 th= 2.22222222222E-5 ells (eel)
1 th= 0.00602250006023 ems (EM)
1 th= 2.54E-23 exameters (Em)
1 th= 1.38888888889E-5 fathoms (fath)
1 th= 8.33333333333E-5 feet (ft)
1 th= 25400000000 femtometers (fm)
1 th= 25400000000 fermi (fermi)
1 th= 0.000222222222222 finger cloth (finer)
1 th= 0.00114285714286 fingerbreadth (fb)
1 th= 8.08659662528E-5 fods (fod)
1 th= 1.26262626263E-7 furlongs (fur)
1 th= 2.54E-14 gigameters (Gm)
1 th= 8.24675324675E-7 greek plethron (pleth)
1 th= 1.37297297297E-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= 1.33932066619E-5 hvats (hvat)
1 th= 0.001 inches (in)
1 th= 2.54E-8 kilometers (km)
1 th= 8.23071937784E-25 kiloparsecs (kpc)
1 th= 9.80694980695E-19 light days (ld)
1 th= 2.35403151066E-17 light hours (lh)
1 th= 1.4118954975E-15 light minutes (lmin)
1 th= 3.26856260456E-20 light months (lm)
1 th= 8.47231487658E-14 light seconds (ls)
1 th= 2.68470563365E-21 light years (ly)
1 th= 0.0120952380952 lines (l)
1 th= 0.000126262373737 links (li)
1 th= 2.54E-11 megameters (Mm)
1 th= 2.54E-5 meters (m)
1 th= 1000 microinches (μin)
1 th= 25.4 micrometers (μm)
1 th= 25400000 micromicrons (μμm)
1 th= 1.57828282828E-8 miles (mi)
1 th= 0.0254 millimeters (mm)
1 th= 1 mils (mil)
1 th= 2.54E-9 myriameters (Mym)
1 th= 0.000444444444444 nails cloth (nail)
1 th= 25400 nanometers (nm)
1 th= 4.57163426926E-9 nautical leagues (Nl)
1 th= 1.37149028078E-8 nautical miles (NM)
1 th= 3.33333333333E-5 paces (pace)
1 th= 0.000333333333333 palms (palm)
1 th= 8.23157939519E-22 parsecs (pc)
1 th= 5.05050505051E-6 perch (perch)
1 th= 2.54E-20 petameters (Pm)
1 th= 0.00600000000472 picas (p)
1 th= 25400000 picometers (pm)
1 th= 0.0960000120945 pixels (PX)
1 th= 1.5875E+30 planck length (pl)
1 th= 0.0719999546457 points (pt)
1 th= 5.05050505051E-6 poles (pole)
1 th= 0.000571428571429 rack unit (ru)
1 th= 0.00600000075591 rems (rem)
1 th= 5.05050505051E-6 rods (rd)
1 th= 7.15492957746E-7 roman actus (actus)
1 th= 4.16666666667E-6 ropes (rope)
1 th= 2.54E-9 scandinavian miles (mil[Scandinavian])
1 th= 0.000111111111111 spans (span)
1 th= 2.54E-17 terameters (Tm)
1 th= 1 thou (th)
1 th= 1.43999092919 twips (twip)
1 th= 2.93302540416E-5 varas [Argentina] (vr[Argentina])
1 th= 3.03029695669E-5 varas [California] (vr[California])
1 th= 2.93981481481E-5 varas [Latin America] (vr[Latin])
1 th= 3.03095391518E-5 varas [Mexico] (vr[Mexico])
1 th= 3.03864098576E-5 varas [Spanish] (vr[Spanish])
1 th= 2.99998818902E-5 varas [Texas] (vr[Texas])
1 th= 2.38095238095E-8 versts (vst)
1 th= 253492002.028 x unit (xu)
1 th= 2.77777777778E-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)
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