Sizes
of Coins (comparisons)
Coins in this
website are shown in millimeter (mm) sizes and are approximate
because of the irregularity of ancient coins. The ancient coins
shown below are only samples of some denominations, and not
all of those types of denominations
will have the same (mm) dimensions.
To give you an
idea of what size a mm is, think of the following familiar items
that you have available.
U.S. Currency
U.S. dimes are
18 mm in diameter
..... 
Roman Denarius
U.S. pennies
are 19 mm in diameter
..... 
Greek Drachma
U.S. nickels
are 21 mm in diameter
...... 
Parthian Drachma
U.S. quarters
are 24 mm in diameter
...... 
Greek Stater
U.S. Silver
Dollars are about 39 mm in diameter.
......
Greek Tetradrachma
Compare
these U.S. coin sizes in mm's to the coins you see listed throughout
the website. Measurements of listed coins are the width of the
coin, and include the frame of the coin if in jewelry form.