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Diameter

The Diameter of ancient coins is usually expressed in millimeters. In FORVMís catalog descriptions you will usually find the coinís weight, then diameter, followed by the die axis. Since many Americans are not familiar with millimeters and because it can help anyone visualize size better, we provide comparisons to modern coins below.

Diameters of Modern Coins for Comparison

U.S. Coins

 

Euro Coins

U.S. Half dollar30.5 mm 2 euro25.75 mm
U.S. Quarter  24.1 mm 1 euro23.25 mm
U.S. Dime    17.9 mm 50 eurocent24.25 mm
U.S. Nickel 21.3 mm 20 eurocent22.25 mm
U.S. Penny   18.9 mm 10 eurocent19.75 mm
   5 eurocent21.75 mm
   2 Eurocent18.75 mm
   1 Eurocent16.25 mm

U.K. Coins

    
2 Pounds28.4 mm   
1 Pound22.5 mm   
Fifty pence27.3 mm (7 sided)   
Twenty Pence21.4 mm (7 sided)   
Ten Pence24.5 mm   
Five pence18 mm   
Two pence 26 mm   
One pence20 mm

Diameter

The Diameter of ancient coins is usually expressed in millimeters. In FORVMís catalog descriptions you will usually find the coinís weight, then diameter, followed by the die axis. Since many Americans are not familiar with millimeters and because it can help anyone visualize size better, we provide comparisons to modern coins below.

Diameters of Modern Coins for Comparison

U.S. Coins

 

Euro Coins

U.S. Half dollar30.5 mm 2 euro25.75 mm
U.S. Quarter  24.1 mm 1 euro23.25 mm
U.S. Dime    17.9 mm 50 eurocent24.25 mm
U.S. Nickel 21.3 mm 20 eurocent22.25 mm
U.S. Penny   18.9 mm 10 eurocent19.75 mm
   5 eurocent21.75 mm
   2 Eurocent18.75 mm
   1 Eurocent16.25 mm

U.K. Coins

    
2 Pounds28.4 mm   
1 Pound22.5 mm   
Fifty pence27.3 mm (7 sided)   
Twenty Pence21.4 mm (7 sided)   
Ten Pence24.5 mm   
Five pence18 mm   
Two pence 26 mm   
One pence20 mm