All pennies minted after 1982 weigh 2.5 grams each. (Older pennies weigh 3.11 grams) Newer cents are made of zinc because the price of copper increased so much that a copper penny was worth more than one cent.
So a roll (50 pennies) would weigh (2.5g times 50 = 125 grams) (125g divided by 28.35 ounces = 4.41oz) (4.41oz divided by 16oz =.28lb) Summary. 50 pennies (1 roll, not counting paper in the roll) (add about 1.5g for the paper) = 125 grams or = 4.41 Ounces or = .28 Pounds or = Probably almost 1/3 of a pound counting the paper.
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It would take 2 rolls of pennies to equal 1 dollar bill.
One modern (post-1982) US cent weighs 2.5 grams, so 4,000 pennies weigh 10,000 grams, or 10 kg.
The current penny weighs 2.5 grams. 1100 x 2.5 = 2750 grams which is about 6.06 pounds (US).
100 new US pennies weigh 250 grams or 8.81849 ounces (about 1/2 pound).
For US money-21500 pennies would equal $215. There are 100 pennies to a dollar.