The current British decimal one penny(1p) coin, usually simply known as a penny has a diameter of 20.3 mm.
One Kilometer = 1,000,000 millimetres.
(1,000,000/20.3) = 49261.08374384236
So there are 49261 pennies in one kilometer.
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A penny is 3/4 of an inch tall, and this is assuming that you are laying the pennies flat on the ground, top to bottom. A kilometer is roughly 40 million inches, so a simple mathematical equation can be used to figure it out. One kilometer of pennies will thus be roughly worth about $524,934.38
240 pennies in one sovereign
100,000 pennies
Diametre of a penn=1.5/10=0.15cm 1Km=100,000cm Coins neede=100,00/0.15=666667
1 kilometer=1,000,000 millimeters