Units Currencies
Constants
Units Home
Unit Conversion
List Units
List Categories
Currencies
Convert Units
SI System
Base Units
Derived Units
Prefixes
Numbers
Constants
Base-N
Fractions
Time / Decimal
Resources
Bibliography
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!

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

more free publications

Materials

Design

Processes

Units

Formulas

Math
 
fermi
Symbol:  F, f 
Category:  Length 
SI Equivalent:  1×10-15 m
Dimension:  L 
 
Notes
Named after the Italian-born American physicist Enrico Fermi (1901-1954), the fermi was used to describe nuclide dimensions in nuclear physics. It has the same order of magnitude as nuclides' radii.
1 F=1 fm
Convert     F, f  
1 F, f =
Length
  Symbol Unit Name
1.88973×10-5  a.u., a0, b  a.u. of length 
10×10-6  Å  angstrom 
3.43775×10-12  arcmin  arcmin 
6.68459×10-27  AU, UA  astronomical unit 
1000  am  attometer 
1.1811×10-13    barleycorn (UK) 
1.88973×10-5  a0, b  bohr (first Bohr radius) 
2.73403×10-17    bolt (US cloth) 
4.72441×10-13  line (UK)  button (UK) 
1.5748×10-12  line (US)  button (US) 
5.39957×10-18    cable length (int.) 
5.39612×10-18    cable length (UK) 
4.55672×10-18    cable length (US) 
3.93701×10-12  caliber, cin  caliber (centiinch) 
1×10-13  cm  centimeter 
3.28084×10-17  ch  chain (engineer's) 
4.97097×10-17  ch  chain (Gunter's) 
3.28084×10-17  ch  chain (Ramsden's) 
4.97097×10-17  ch  chain (surveyor's) 
2.18723×10-15    cubit (UK) 
1×10-16  dam  decameter 
10×10-15  dm  decimeter 
0.354869  re  electron classical radius 
8.74891×10-16    ell 
2.37107×10-13    ems (pica) 
1×10-33  Em  exameter 
5.46807×10-16  fath  fathom 
1  fm  femtometer 
1.88973×10-5  a0, b, a.u.  first Bohr radius 
3.28084×10-15  ft  foot 
3×10-12  fr  French 
4.97097×10-18  fur  furlong (UK) 
4.97097×10-18  fur  furlong (US) 
1×10-24  Gm  gigameter 
9.84252×10-15  hd  hand (UK) 
1×10-17  hm  hectometer 
1.05702×10-40    hubble 
3.93701×10-14  in  inch 
1×10-18  km  kilometer 
3.24078×10-35  kpc  kiloparsec 
2.07168×10-19    league (Canadian) 
1.79986×10-19  leag. (int. naut.)  league (int. naut.) 
2.07124×10-19  leag. (stat.)  league (statute, land) 
1.79871×10-19  leag. (UK, naut.)  league (UK, naut.) 
1.79871×10-19  leag. (US, naut.)  league (US, naut.) 
3.8607×10-29    light-day 
9.26567×10-28    light-hour 
5.5594×10-26    light-minute 
3.33564×10-24    light-second 
1.05702×10-31  ly  light-year 
4.72441×10-13  line (UK)  line (UK) 
1.5748×10-12  line (US)  line (US) 
3.28084×10-15    link (engineer's) 
4.97097×10-15    link (Gunter's) 
3.28084×10-15    link (Ramsden's) 
4.97097×10-15    link (surveyor's) 
1×10-21  Mm  megameter 
1×10-15  m  meter 
3.93701×10-8  µin  microinch 
1×10-9  µm  micron 
3.93701×10-11  mil, thou  mil (thou) 
1.34742×10-19  mile (geogr.)  mile (geographical) 
6.2137×10-19  mi (int.)  mile (international) 
5.39957×10-19  mi (naut., int.)  mile (nautical, international) 
5.38991×10-19  mi (naut., teleg.)  mile (nautical, telegraph) 
5.39612×10-19  mi (naut., UK, US)  mile (nautical, UK, US) 
6.21371×10-19  mi (stat.)  mile (statute, land) 
6.2137×10-19  mi (survey, US)  mile (survey, US) 
10×10-13  mm  millimeter 
1×10-6  mµ, nm  millimicron 
4.37445×10-15    nail (UK) 
1×10-6  nm  nanometer 
5.39957×10-19  mi (int. naut.)  nautical mile (international) 
5.39612×10-19  mi (UK, US, naut.)  nautical mile (UK, US) 
1.31234×10-15    pace (UK) 
1.31234×10-14    palm (UK) 
3.24078×10-32  pc  parsec 
1.98839×10-16  rd  perch (rod, pole) 
1×10-30  Pm  petameter 
2.37106×10-13    pica 
1×10-3  pm  picometer 
2.84528×10-12    point (US printer's) 
1.98839×10-16  rd  pole (rod, perch) 
1×10-22    quadrant 
1.98839×10-16  rd  rod (perch, pole) 
1.64042×10-16    rope (UK) 
4.37445×10-15    span 
1×10-27  Tm  terameter 
3.93701×10-11  thou, mil  thou (mil) 
9.99792×10-3  UX, X  X-unit 
1.09361×10-15  yd  yard 
10×108  ym  yoctometer 
10×10-40  Ym  yottameter 
1×106  zm  zeptometer 
10×10-37  Zm  zettameter 
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!

Selecting the Right 3D Printer

Discover how to choose the right 3D printer for your needs and the key performance attributes to consider.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

more publications