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Feet may be shown as ft. or ' and inches as in. or ''.
Conversion: millimeters to meters und meter to millimeter and more
Conversions of many more length units
Inches and centimeters in comparison
Length and distance units conversion chart
Sorted in alphabetical order
| Name of length unit. l | Symbol | Definition | Relation to SI unit length in m |
| angstrom | Å | - | ≡1.000×10−10 m = 0.1 nm |
| astronomical unit | AU | - | = 149 597 870.691 ±0.030 km |
| atomic unit of length | au | ≡a0 | ≈ 5.291 772 083×10−11 ±19×10−20 m |
| barley corn | - | ≡1/3 in | ≈ 8.466 667 mm |
| Bohr radius | a0; b | ≡α/(4πR∞) | ≈ 5.291 772 083×10−11 ±19×10−20 m |
| cable length (Imperial) | - | ≡608 ft | = 185.3184 m |
| cable length (International) | - | ≡1/10 NM | = 185.2 m |
| cable length (U.S.) | - | ≡720 ft | = 219.456 m |
| calibre | cal | ≡1 in | = 25.4 mm |
| chain (Gunter's Surveyor's) | ch | ≡66 ft | = 20.1168 m |
| chain; (Ramsden's; Engineer's) | ch | ≡100 ft | = 30.48 m |
| cubit | - | ≡18 in | = 0.4572 m |
| ell | ell | ≡45 in | = 1.143 m |
fathom |
fm |
≡6 ft | = 1.8288 m |
| ≈ 1/1000 NM | = 1.852 m | ||
| fermi | fm | ≡1.000×10−15 m | = 1.000×10−15 m |
| finger | - | ≡7/8 in | = 22.225 mm |
| finger (cloth) | - | ≡4 ½ in | = 0.1143 m |
| foot (Benoît) | ft (Ben) | - | ≈ 0.304 799 735 m |
| foot (Clarke's; Cape) | ft (Cla) | - | ≈ 0.304 797 265 4 m |
| foot (Indian) | ft Ind | - | ≈ 0.304 799 514 m |
| foot (International) | ft | ≡1/3 yard = 12 in | = 0.3048 m ! |
| foot (Sear's) | ft (Sear) | - | ≈ 0.304 799 47 m |
| foot (U.S. Survey) | ft (US) | ≡1200/3937 m | ≈ 0.304 800 610 m |
| furlong | fur | ≡660 ft | = 201.168 m |
| geographical mile | mi | ≡6082 ft | = 1853.7936 m |
| hand | - | ≡4 in | = 0.1016 m |
| inch | in | ≡1/36 yd = 1/12 ft | = 25.4 mm ! |
| league | lea | ≡3 mi | = 4828.032 m |
| light-day | - | ≡24 light-hours | = 2.590 206 837 12×1013 m |
| light-hour | - | ≡60 light-minutes | = 1.079 252 848 8×1012 m |
| light-minute | - | ≡60 light-seconds | = 1.798 754 748×1010 m |
| light-second | - | - | ≡2.997 924 58×108 m |
| light-year | l.y. | ≡c0 × 86 400 × 365.25 | = 9.460 730 472 580 8×1015 m |
| line | ln | ≡1/12 in (Klein 1988, 63) | ≈ 2.116 667 mm |
| link (Gunter's; Surveyor's) | lnk | ≡1/100 ch | = 0.201 168 m |
| link (Ramsden's; Engineer's) | lnk | ≡1 ft | = 0.3048 m |
| metre (SI base unit) | m | ≡1 m | = 1 m |
| mickey | - | ≡1/200 in | = 1.27×10−4 m |
| micron | µ | - | ≡1.000×10−6 m |
| mil; thou | mil | ≡1.000×10−3 in | = 2.54×10−5 m |
| mile | mi | ≡1760 yd = 5280 ft | = 1609.344 m ! |
| mile (U.S. Survey) | mi | ≡5280 ft (US) | = 5280 × 1200/3937 m ≈ 1609.347 219 m |
| nail (cloth) | - | ≡2 ¼ in | = 57.15 mm |
| nautical league | NL; nl | ≡3 NM | = 5556 m |
| nautical mile | NM; nm | ≡1852 m | |
| nautical mile (Admiralty) | NM (Adm); nm (Adm) | ≡6080 ft | = 1853.184 m |
| pace | - | ≡2.5 ft | = 0.762 m |
| palm | - | ≡3 in | = 76.2 mm |
| parsec | 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 |
| point (ATA) | pt | ≡0.013837 in | = 0.351 459 8 mm |
| point (Didot; European) | pt | - | ≡0.376 065 mm |
| point (metric) | pt | ≡3/8 mm | = 0.375 mm |
| point (PostScript) | pt | ≡1/72 in | ≈ 0.352 778 mm |
| quarter | - | ≡¼ yd | = 0.2286 m |
| rod; pole; perch | rd | ≡16 ½ ft | = 5.0292 m |
| rope | rope | ≡20 ft | = 6.096 m |
| span | - | ≡6 in | = 0.1524 m |
| span (cloth) | - | ≡9 in | = 0.2286 m |
| spat | S | ≡1012 m | = 1 Tm |
| stick | - | ≡2 in | = 50.8 mm |
| stigma; pm | - | ≡1.000×10−12 m | ≡1.000×10−12 m |
| telegraph mile | mi | ≡6087 ft | = 1855.3176 m |
| twip | twp | ≡1/1440 in | ≈ 1.763 889×10−5 m |
| x unit; siegbahn | xu | - | ≈ 1.0021×10−13 m |
| yard (International) | yd | ≡3 ft = 0.9144 m | = 0.9144 m |
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
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