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
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.

CNC Machining Design Guide

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

Mechanical Engineers Outlook

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

more free publications
 
dalton (atomic unit of mass)
Symbol:  u, uma, Da 
Category:  Mass 
SI Equivalent:  1.66054×10-27 kg
Dimension
 
Notes
Named after J. Dalton (1766-1844), one dalton is equal to 1/12 of the mass of the carbon 12 atom.
Convert     u, uma, Da  
1 u, uma, Da =
Mass
  Symbol Unit Name
1822.89  m0, me  a.u. of mass (electron rest mass) 
5.69322×10-26    assay ton 
u, uma, Da(12C), AMU  atomic unit of mass (12C) 
1.00032  u, uma, Da(16O), AMU  atomic unit of mass (16O) 
0.992236  u, uma, Da(1H), AMU  atomic unit of mass (1H) 
1.66054×10-6  ag  attogram 
1.00011×10-3    avogram 
3.89454×10-29    bag (UK, cement) 
8.3027×10-24  ct.  carat (metric) 
8.09242×10-24  ct (troy)  carat (troy) 
3.66086×10-29  cH, cwt  cental 
1.66054×10-22  cg  centigram 
1.66054×10-25  dag  decagram 
1.66054×10-23  dg  decigram 
4.27101×10-25  dr (troy)  dram (troy) 
4.27101×10-25  dr (ap.), dr (apoth.)  dram or drachm (apothecary) 
9.37181×10-25  dr (av.), dr (avdp)  dram or drachm (avoirdupois) 
1822.89  m0, me  electron rest mass (a.u. of mass) 
1.66054×10-42  Eg  exagram 
1.66054×10-9  fg  femtogram 
1.66054×10-18  g  gamma (mass) 
1.13783×10-28  slug  geepound (slug) 
1.66054×10-33  Gg  gigagram 
2.56261×10-23  gr (apoth.), gr (ap.)  grain (apothecary) 
2.56261×10-23  gr (avdp.), gr (av.)  grain (avoirdupois) 
2.56261×10-23  gr (troy)  grain (troy) 
1.66054×10-24  g  gram 
1.66054×10-26  hg  hectogram 
3.26863×10-29  cH, cwt, lg cwt  hundredweight (gross or long) 
3.66086×10-29  sh. cwt  hundredweight (net or short) 
3.26863×10-29  cwt (av.)  hundredweight (UK, avoirdupois) 
1.69328×10-28  Hyl, hyl  hyl 
1.66054×10-27  kg  kilogram 
3.66086×10-30  kip  kilopound (kip) 
2.82474×10-30    load (UK) 
1.74327×10-30    load (UK, wool) 
1.63431×10-30  lg ton (UK)  long ton (UK) 
1.66054×10-30  Mg  megagram 
1.69328×10-28  mug  metric slug (hyl) 
1.66054×10-18  µg  microgram 
1.66054×10-21  mg  milligram 
1.69328×10-28    MKpS unit of mass 
1.69328×10-28  mug  mug (hyl, metric clug, par, TME) 
1.66054×10-15  ng  nanogram 
5.33876×10-26  oz (apoth.), oz (ap.)  ounce (apothecary) 
5.85738×10-26  oz (advp.), oz (av.)  ounce (avoirdupois) 
5.33876×10-26  oz (troy)  ounce (troy) 
1.69328×10-28  par  par (hyl, mug, metric slug) 
1.06775×10-24  dwt (troy)  pennyweight (troy) 
1.66054×10-39  Pg  petagram 
1.66054×10-12  pg  picogram 
3.66086×10-27  lb  pound 
3.66086×10-27  lb (av.)  pound (avoirdupois) 
4.44897×10-27  lb (troy), lb (tr.)  pound (troy) 
6.10144×10-27  lb (UK, new hay)  pound (UK, new hay) 
5.69468×10-27  lb (UK, obsolete hay)  pound (UK, obsolete hay) 
3.66086×10-27  lb (UK, straw)  pound (UK, straw) 
3.66087×10-27  lb (US)  pound (US) 
1.30745×10-28    quarter (UK, mass) 
6.53726×10-30    quarter (US, long) 
7.32173×10-30    quarter (US, short) 
1.66054×10-29  q  quintal (metric) 
3.66086×10-29  quint. (US, UK)  quintal (US, UK) 
1.04596×10-29    sack (UK, weight) 
1.2813×10-24  s, scr (ap.)  scruple (UK, US, apoth.) 
1.83043×10-30  sh. Ton  short ton (US, ton) 
1.13783×10-28    slug (geepound) 
2.6149×10-28  st (UK)  stone (UK) 
2.92869×10-28  st (UK, wool)  stone (UK, wool) 
1.66054×10-36  Tg  teragram 
1.66054×10-30    ton (metric) 
1.63431×10-30  UK ton, lg ton  ton (UK, long) 
1.83043×10-30    ton (US, short) 
1.66054×10-30  t  tonne (metric) 
1.01691×10-28    truss 
1.66054  yg  yoctogram 
1.66054×10-48  Yg  yottagram 
1.66054×10-3  zg  zeptogram 
1.66054×10-45  Zg  zettagram 
Glossary
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.

CNC Machining Design Guide

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

Mechanical Engineers Outlook

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