# What are the metric units of distance

Name of the length unitRelationship to the SI unit meter (m)Meter (SI base unit of length)≡ 1 m  Fermi; fm≡ 1,000·10-15 mX unit; victory track, xu≈ 1,0021·10-13 mStigma; pm≡ 1,000·10-12 mBohr radius; a 0; b≡ α / (4πR. 8) ≈ 5,291 772 083·10-11 ± 19·10-20 mAtomic unit of length; ouch≡ a 0 ≈ 5.291 772 083·10-11 ± 19·10-20 mÅngström; Å≡ 1,000·10-10 m = 0.1 nmMicron; µ; µm≡ 1,000·10-6 m = 1 µmTwip; partly≡ 1/1440 inch ≈ 1.763 889·10-5 mMil; thou≡ 10-3 inch = 2.54·10-5 mMickey≡ 1/200 inch = 1.27·10-5 mCaliber; cal≡ 1 inch = 25.4 mmPoint (ATA); pt≡ 0.013837 inch = 0.351 459 8 mmPoint (PostScript); pt≡ 1/72 inch ≈ 0.352 778 mmPoint (metric); pt≡ 3/8 mm = 0.375 mmPoint (Didot; European); pt≡ 0.376 065 mmLine; ln≡ 1/12 inch ≈ 2.116 667 mmLine (Paris); "ligne"; l≡ 1/12 p = 1 / 443.296 m ≈ 2.255 829 mmLine (Quebec) "ligne"; l (Qc)≡ 1/12 p (Qc) = 2.255 837 5 mmBarley corn≡ 1/3 inch ≈ 8.466 667 mmfinger≡ 7/8 inch = 22.225 mmInch (inch); in≡ 1/36 yd = 25.4 mmU.S. survey inch; in≡ 1/12 U.S. survey foot = 100/3937 m ≈ 25.400051 mmInch (Paris) "pouce"; p≡ 1/12 P = 1 / (36 + 11.296 / 12) m ≈ 27.069 949 mmIinch (Quebec); "pouce"; p (Qc)≡ 1/12 P (Qc) = 27.070 05 mmStick≡ 2 inch = 50.8 mmNail (cloth)≡ 2 1/4 inch = 57.15 mmPalm≡ 3 inch = 76.2 mmhand≡ 4 inch = 0.1016 mFinger (cloth)≡ 4 1/2 inch = 0.1143 mChip≡ 6 inch = 0.1524 mLink (Gunter's); lnk≡ 66/100 ft = 0,201 168 mChip (cloth)≡ 9 inch = 0.2286 mQuarter≡ 1/4 yd = 0.2286 mLink (Ramden's; Engineer's); lnk≡ 1 ft = 0.3048 mFoot (Clarke's; Cape); ft (Cla)≈ 0.304 797 265 4 mFoot (Sear's); ft (Sear)≈ 0.304 799 47 mFoot (Indian); ft (ind)≈ 0.304 799 514 mFoot (Benoît) ft (Ben)≈ 0.304 799 735 mFoot; ft≡ 12 inch = 0.3048 mFoot (American; U.S. Survey); ft≡ 1200/3937 m ≈ 0.304 800 610 mFoot (Paris); "pied"; P≡ 1 / (3 + 11,296 / 144) m ≈ 0.324 839 385 mFoot (Quebec) "pied"; P (Qc)≡ 1.06575 ft = 0.324 840 6 mCubit≡ 18 inch = 0.4572 mPace≡ 2 1/2 ft = 0.762 mYard; yd≡ 3 ft = 0.9144 mEll≡ 45 inch = 1.143 mFathom; fm≡ 6 ft = 1.8288 m
(sometimes = 1/1000 NM = 1.852 m)Rod; Pole; Perch; approx ≡ 16 1/2 ft = 5.0292 mRope≡ 20 ft = 6.096 mChain (Gunter's); ch ≡ 66 ft = 20.1168 mChain (Ramden's; Engineer's); ch ≡ 100 ft = 30.48 mArpent (Paris); arp ≡ 180 P = 25 920 / 443.296 m ≈ 58.471 089 mArpent (Quebec); arp (Qc) ≡ 180 P (Qc) = 58.471 308 mCable length (International)≡ 1/10 NM = 185.2 mCable length (Imperial)≡ 608 ft = 185.3184 mFurlong; For ≡ 660 ft = 201.168 mCable length (U.S.)≡ 720 ft = 219.456 mMile; mi ≡ 1760 yd = 5280 ft = 1609.344 mMile (American; Statute; U.S. Survey)≡ 5280 ft (US) = 5280·1200/3937 m ≈ 1609.347 219 mNautical mile; NM; nm≡ 1852 mNautical mile (Admiralty); NM (Adm)≡ 6080 ft = 1853.184 mGeographical mile; mi≡ 6082 ft = 1853.7936 mTelegraphmile; mi≡ 6087 ft = 1855.3176 mLeague; lea = 3 mi = 4828.032 mStatute league; lea≡ 3 mi (US) ≈ 4828.041 656 mNautical league; NL; nl≡ 3 NM = 5556 mLight-second≡ 2,997 924 58·108 mLight-minute≡ 60 light seconds = 1.798 754 748·1010 mAstronomical unit; AU≡ 149 597 870.691 ± 0.030 kmLate; S. ≡ 1,000·1012 m = 1 TmLight hour≡ 60 light minutes = 1.079 252 848 8·1012 mLight-day≡ 24 light hours = 2.590 206 837 12·1013 mLight-year; l.y.≡ 9,460 730 472 580 8·1015 mParsec; pc ≈ 180·60·60 / π AU ≈ 206 264.806 25 AU
≡ 3,261 563 776 9 ±6·10−10 light years
≡ 3,085 677 581 3·1016 ±6·106 m

The most common Lengths are:
1 kilometer (km) equals 1000 or 103 meter
1 meter (m) corresponds to 10 decimeters or 100 centimeters
1 decimeter (dm) corresponds to 10 centimeters or 10−1 meter
1 centimeter (cm) is equal to 10 millimeters or 10−2 meter
1 millimeter (mm) is equal to 1000 micrometers or 10−3 meter
1 micrometer (mym) equals 1000 nanometers or 10−6 meter
1 nanometer (nm) equals 10−9 meter

1 km = 1·103 m = 1·106 mm = 1·109 µm = 1·1012 nm = 1·1015 pm
1 m = 1·103 mm = 1·106 µm = 1·109 nm = 1·1012 pm
1 mm = 1·103 µm = 1·106 nm = 1·109 pm
1 µm = 1·103 nm = 1·106 pm
1 nm = 1·103 pm