# Supplementary Information for "Converting currencies in the Old World" Nature, V411, 437

 Table 1 Weight systems between the Third and First Millennium BC Standard Weight Systems Mass. Talents Minas Shekels Equivalences Weights Syrian talent Kg. 28.200 mina g. 470 x 60 Hittite shekel (HS) g. 11.75 x 40 x 2400 5/4 of 9.43/2 of 7.8312/7 de 6.849/5 of 6.58 (HS) 2+2=5 (US-EK)(HS) 2=2+1 (EKS) (HS) 5+2=10+2 (IS) (HS) 5=5+2+2 (AS) Ugaritic shekel (US) g. 9.4 x 50 x 3000 7/10 of 13.68 3/4 of 12.834/5 of 11.7511/10 of 8.556/5 of 7.8311/8 of 6.8410/7 of 6.58 (US) 10=5+2 (DS) (US) 2+2=2+1 (ED)(US) 5=2+2 (HS)(US) 10=10+1 (MS)(US) 5=5+1 (EKS)(US) 5+2=10 (IS)(US) 5+2=10 (AS) Egyptian kdt(Dynasty XVIII...) (EK) g. 9.4 x 3000 7/10 of 13.683/4 of 12.834/5 of 11.7511/10 of 8.556/5 of 7.8310/7 of 6.58 (EK) 10=5+2 (DS)(EK) 2+2=2+1 (ED)(EK) 5=2+2 (HS)(EK) 10=10+1 (MS)(EK) 5=5+1 (EKS)(EK) 5+2=10 (IS) Eblaite-Carcemish shekel (EKS) g. 7.83 x 60 x 3600 4/7 of 13.688/13 of 12.832/3 of 11.755/6 of 9.412/13 of 8.558/7 of 6.84 (EKS) 5+2=2+2 (DS)(EKS) 10+2+1=5+2+ (ED)(EKS) 2+1=2 (HS) (EKS) 5+1=5 (US-EK)(EKS) 10+2+1=10+2 (MS)(EKS) 5+2=5+2+1 (IS) Mesopotamian talent Kg. 30.800 Mesopotamian mina 513 x 60 Mesopotamian shekel (MS) g. 8.55 x 60 x 3600 10/16 of 13.683/2 of 12.8310/11 of 9.413/12 of 7.835/4 of 6.8413/10 of 6.58 (MS) 10+5+1=10 (DS)(MS) 2=2+1 (ED)(MS) 10+1=10 (US-EK)(MS) 10+2=10+2+1 (EKS)(MS) 2+2=5 (IS)(MS) 10=10+2+1 (AS) Egyptian gold dbn (Dynasty VI-XVII) (ED) g. 12.8(3) x 2400 15/16 of 13.684/3 of 9.42/3 of 8.5513/8 of 7.832/1(15/8) of 6.842/1 of 6.58 (ED) 10+5+1=10+5 (DS)(ED) 2+1=2+2 (US-EK) (ED) 2+1=2 (MS)(ED) 5+2+1=10+2+1 (EKS)(ED) 1=2 (5+2+1)=(10+5) (IS)(ED) 1=2 (AS) Dilmun mina g. 1368 x 22.5 Dilmun shekel (DS)Indus "shekel" (IS) g.g. 13.68 6.84 x 2250x 4500 16/15 of 12.8310/7 of 9.416/10 of 8.557/4 of 7.832/1 of 6.8425/12 of 6.58 (DS) 10+5=10+5+1 (ED)(DS) 5+2=5+5 (US-EK)(DS) 10=10+5+1 (MS)(DS) 2+2=5+2 (EKS)(DS) 1=2 (IS)(DS) 10+2=10+10+5 (AS) Ashdodite talent Kg. 23.700 mina g. 474 x 50 Ashdodite shekel (AsS) g. 7.9 (7.83) x 60 x 3000 4/7 of 13.688/13 of 12.8312/3 of 11.755/6 of 9.412/13 of 8.556/5 of 6.58 (AsS) 5+2=2+2 (DS)(AsS) 10+2+1=5+2+1 (ED)(AsS) 2+1=10+2 (HS)(AsS) 5+1=5 (US-EK)(AsS) 10+2+1=10+2 (MS)(AsS) 5=5+1 (AS) Aegean talent Kg. 31.600 mina g. 480 x 65.8 Aegean "stater" (AS) g. 65.8 6.58 x 72 x 4800 12/25 of 13.681/2 of 12.835/9 of 11.757/10 of 9.4 10/13 of 8.555/6 of 7.925/26 of 6.84 (AS) 10+10+5=10+2 (DS)(AS) 2=1 (ED) (AS) 5+2+2=5 (SH)(AS) 10=5+2 (US-EK)(AS) 10+2+1=10 (MS)(AS) 5+1=5 (EKS)(AS) 10+10+5+1=10+10+5 (IS)

 Table 2 Two examples of the continuous conversion of a fixed weight SourceAfghanistan Raw materialexample 1 SourceAfghanistan Raw materialexample 2 Route East-West Lapis lazuli "ingot" 1,370 g. Route East-West Tin ingot4,700 g. or 4.7 kg. dilmun-indus "shekel"(India-Persian Gulf) 100 "shekels" dilmun-indus "shekel" 344 "shekels"3.5 minas mesopotamian shekel(Irak) 160 shekels100+50+10 mesopotamian shekel 550 shekels eblaite-karkemish shekel (Syria) 175 shekels100+50+20+5 eblaite-karkemish shekel 600 shekels10 minas ugaritic shekel(Syria) 145 shekels100+20+20+5 ugaritic shekel 500 shekels10 minas hittite shekel(Turkey) 117 shekels100+10+5+1+1 hittite shekel 400 shekels10 minas ashdodite shekel(Palestine) 175 shekels100+50+20+5 ashdodite shekel 600 shekels10 minas gold egyptian dbn(Egypt) 107 dbn100+5+1+1 gold egyptian dbn 366 dbn egyptian kdt(Egypt) 145 kdt100+20+20+5 egyptian kdt 500 shekels5 sep aegean "stater"(Crete-Greece) 208 "shekels"100+100+5+2+1 aegean "stater" 71 "shekels"4.5 M*