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List Units: A B C D E-F G H-I J-L M N O-P Q-R S T U-Z
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Length
Unit Name Symbol SI Equivalent 
· a.u. of length 
a.u., a0, b  5.29177x10-11 m 
· angstrom 
Å  1x10-10 m 
· arcmin 
arcmin  2.90888x10-4 m 
· astronomical unit 
AU, UA  1.49598x1011 m 
· attometer 
am  1x10-18 m 
· barleycorn (UK) 
  8.46667x10-3 m 
· bohr (first Bohr radius) 
a0, b  5.29177x10-11 m 
· bolt (US cloth) 
  36.576 m 
· button (UK) 
line (UK)  2.11667x10-3 m 
· button (US) 
line (US)  6.35x10-4 m 
· cable length (int.) 
  185.2 m 
· cable length (UK) 
  185.318 m 
· cable length (US) 
  219.456 m 
· caliber (centiinch) 
caliber, cin  2.54x10-4 m 
· centimeter 
cm  10x10-3 m 
· chain (engineer's) 
ch  30.48 m 
· chain (Gunter's) 
ch  20.1168 m 
· chain (Ramsden's) 
ch  30.48 m 
· chain (surveyor's) 
ch  20.1168 m 
· cubit (UK) 
  0.4572 m 
· decameter 
dam  10 m 
· decimeter 
dm  0.1 m 
· electron classical radius 
re  2.81794x10-15 m 
· ell 
  1.143 m 
· ems (pica) 
  4.2175x10-3 m 
· exameter 
Em  10x1017 m 
· fathom 
fath  1.8288 m 
· femtometer 
fm  1x10-15 m 
· fermi 
F, f  1x10-15 m 
· first Bohr radius 
a0, b, a.u.  5.29177x10-11 m 
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List Units: A B C D E-F G H-I J-L M N O-P Q-R S T U-Z
Glossary
FREE Publications
CNC Machining Design Guide

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

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Metal 3D Printing Design Guide

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

more publications