Units Currencies
Units Home
Unit Conversion
List Units
List Categories
Convert Units
SI System
Base Units
Derived Units
Time / Decimal
NASA Tech Briefs

Innovations developed by NASA and its industry partners in a wide array of fields.

Reinforced Plastics

Informed and impartial coverage on the global composites industry.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

Laser Focus World

Semiconductors, medical equipment, lasers, optics and aviation and aerospace.

more free magazines
dalton (atomic unit of mass)
Symbol:  u, uma, Da 
Category:  Mass 
SI Equivalent:  1.66054×10-27 kg
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 =
  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