See the link below from the U S Mint. They estimate as much as 200,035,318,672 are currently in circulation. Since the first penny was made in 1787, more than 300 billion have been made according to the US mint.
http://www.kokogiak.com/megapenny/twelve.asp
How much does a 2 liter of pennies weigh?
400 pennies.
4000000 pennies is exactly 4000000 pennies.
In the UK 300 pennies = 3 pounds
633,600 pennies
9000 pennies weigh
2478 pennies is $24.78.
6000000 pennies in dollara
400 pennies
10 pennies per dime.
There are 100 Pennies in a Pound, so 8000 Pennies would be £80 GBP.
If you mean pennies as cents, then it is $1000.00 or £1000.00 if you mean pennies from pounds.