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CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

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millimeter
Symbol:  mm 
Category:  Length 
SI Equivalent:  1×10-3 m
Dimension:  L 
System:  SI 
Convert     mm  
1 mm =
Length
  Symbol Unit Name
1.88973×107  a.u., a0, b  a.u. of length 
1×107  Å  angstrom 
3.43775  arcmin  arcmin 
6.68459×10-15  AU, UA  astronomical unit 
1×1015  am  attometer 
0.11811    barleycorn (UK) 
1.88973×107  a0, b  bohr (first Bohr radius) 
2.73403×10-5    bolt (US cloth) 
0.472441  line (UK)  button (UK) 
1.5748  line (US)  button (US) 
5.39957×10-6    cable length (int.) 
5.39612×10-6    cable length (UK) 
4.55672×10-6    cable length (US) 
3.93701  caliber, cin  caliber (centiinch) 
0.1  cm  centimeter 
3.28084×10-5  ch  chain (engineer's) 
4.97097×10-5  ch  chain (Gunter's) 
3.28084×10-5  ch  chain (Ramsden's) 
4.97097×10-5  ch  chain (surveyor's) 
2.18723×10-3    cubit (UK) 
1×10-4  dam  decameter 
1×10-2  dm  decimeter 
3.54869×1011  re  electron classical radius 
8.74891×10-4    ell 
0.237107    ems (pica) 
1×10-21  Em  exameter 
5.46807×10-4  fath  fathom 
1×1012  fm  femtometer 
1×1012  F, f  fermi 
1.88973×107  a0, b, a.u.  first Bohr radius 
3.28084×10-3  ft  foot 
3  fr  French 
4.97097×10-6  fur  furlong (UK) 
4.97097×10-6  fur  furlong (US) 
1×10-12  Gm  gigameter 
9.84252×10-3  hd  hand (UK) 
1×10-5  hm  hectometer 
1.05702×10-28    hubble 
3.93701×10-2  in  inch 
1×10-6  km  kilometer 
3.24078×10-23  kpc  kiloparsec 
2.07168×10-7    league (Canadian) 
1.79986×10-7  leag. (int. naut.)  league (int. naut.) 
2.07124×10-7  leag. (stat.)  league (statute, land) 
1.79871×10-7  leag. (UK, naut.)  league (UK, naut.) 
1.79871×10-7  leag. (US, naut.)  league (US, naut.) 
3.8607×10-17    light-day 
9.26567×10-16    light-hour 
5.5594×10-14    light-minute 
3.33564×10-12    light-second 
1.05702×10-19  ly  light-year 
0.472441  line (UK)  line (UK) 
1.5748  line (US)  line (US) 
3.28084×10-3    link (engineer's) 
4.97097×10-3    link (Gunter's) 
3.28084×10-3    link (Ramsden's) 
4.97097×10-3    link (surveyor's) 
1×10-9  Mm  megameter 
1×10-3  m  meter 
3.93701×104  µin  microinch 
1000  µm  micron 
39.3701  mil, thou  mil (thou) 
1.34742×10-7  mile (geogr.)  mile (geographical) 
6.2137×10-7  mi (int.)  mile (international) 
5.39957×10-7  mi (naut., int.)  mile (nautical, international) 
5.38991×10-7  mi (naut., teleg.)  mile (nautical, telegraph) 
5.39612×10-7  mi (naut., UK, US)  mile (nautical, UK, US) 
6.21371×10-7  mi (stat.)  mile (statute, land) 
6.2137×10-7  mi (survey, US)  mile (survey, US) 
1×106  mµ, nm  millimicron 
4.37445×10-3    nail (UK) 
1×106  nm  nanometer 
5.39957×10-7  mi (int. naut.)  nautical mile (international) 
5.39612×10-7  mi (UK, US, naut.)  nautical mile (UK, US) 
1.31234×10-3    pace (UK) 
1.31234×10-2    palm (UK) 
3.24078×10-20  pc  parsec 
1.98839×10-4  rd  perch (rod, pole) 
1×10-18  Pm  petameter 
0.237106    pica 
1×109  pm  picometer 
2.84528    point (US printer's) 
1.98839×10-4  rd  pole (rod, perch) 
1×10-10    quadrant 
1.98839×10-4  rd  rod (perch, pole) 
1.64042×10-4    rope (UK) 
4.37445×10-3    span 
1×10-15  Tm  terameter 
39.3701  thou, mil  thou (mil) 
9.99792×109  UX, X  X-unit 
1.09361×10-3  yd  yard 
1×1021  ym  yoctometer 
1×10-27  Ym  yottameter 
1×1018  zm  zeptometer 
1×10-24  Zm  zettameter 
Glossary
FREE Publications
CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

more publications