It depends on the year the coin was minted.
Quarters made since 1965 are copper clad with cupronickel, and weigh 5.67 gm each. Interestingly that's 0.2 US ounces so even though coins are measured in metric units, exactly 5 quarters weigh one US ounce.
From the 1870s to 1964, US quarters were made of 90% silver/10% copper and weighed 6.25 gm. A US ounce is 28.35 gm so doing the division works out to about 4.54 coins per ounce.
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Current US quarters weigh 5.67 gm, which is 0.2 US ounces. That means five quarters weigh one US ounce; a pound is 16 ounces so it's the same weight as 16 X 5 = 80 quarters.
There are 4 quarters in a dollar, so there are 100 quarters in a pound (as there are 100 cents in a dollar). Therefore, one pound of quarters would be equivalent to $25 (100 quarters ÷ 4 quarters per dollar = 25 dollars).
One 1964 or earlier silver quarter= 0.1808 of an ounce of silver. So, it takes about 6 90% silver quarters to make one ounce of silver. 6 silver quarters= 1.0851 ounces.
There are 80 quarters in a US pound. This is because a quarter weighs 5.67 grams, and there are 453.592 grams in a pound. By dividing the total weight of a pound by the weight of a quarter, we find that there are 80 quarters in a US pound.
There are approximately 28 US Dollar notes in 1 Ounce.