Hey,
I was wondering, how many different coins might be in the world, I mean since the beginning of coins until now?
Don't know but I heard there's like 1 million different roman coins, and the rest might also be 1 million.
So I will assume 2 million different coins struck since the first coin.
What do you think?
how many different coins might be in the world?
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Since the dawn of coins? Well, cosidering every early hand made coin is (more or less) one of a kind, I'd say 1,000 billion. 
Still long way to go. 
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No idea due to so many factors but I will levy a good portion are weighing down my kitchen table right now waiting to be sorted 
But I goggled it and found an interesting answer on Yahoo someone was giving to kid who had an assignment where a teacher was asking how many coins are in circulation currently.
Best Answer: You should ask what he means by* "in circulation." And, for the USA, or for the whole world?
Do you eliminate the coins that are in piggy banks, or in storage* in banks, and the federal reserve?
What about coins in collections, or stashed away in coin books, not being circulated?
Given the fact that many silver coins were melted down when price of silver went up, and millions of coins have been lost, or thrown into "wishing wells", never to be seen again, for centuries, the answer he's looking for can never be very accurate.
I'd write your teacher a short answer explaining the "flaws" in his assignment, and instead substitute this answer:
How much money is in circulation?
Because that number is calculated weekly.
It changes weekly, just as the number of coins in circulation would change daily, or weekly.
Much of our money "circulates" only as electronic blimps, neither paper or coined money.
It is calculated as M1, M2, M3. and by other names.
Does your teacher want all them added up?
Or should you pick only one?
That's why there is no good answer for this question.
Read more about it at links below.
EDIT: At my second resource below, I read that 99 percent of money in circulation is federal reserve notes. That means that 1 percent must be coinage.
Another source said about 1 trillion USA bucks of different denomination are in circulation any week.
From that fact, one may interpolate that about $10,000,000,000 (ten Billion in coins--which is 1 percent of $1 trillion) would be coins circulation.
Second Edit: Helmuts links are good. I noticed that just one year, 2009, about 10 billion coins were minted, and about 250 billion since 2000.
But, this doesn't address problem of "how many still in circulation?"
I suppose that even the Federal Reserves figures on Helmut's first link of 2.58 Trillion coins is close to accurate, (except Helmut added three extra zeros to correct number) .
Yet, I do not know how the Treasury knows exactly?
So much business is done nowadays electronicly, coins are less important than years ago.
More than 1/2 of the total coins "in circulation" are actually pennies too, according to U.S. Treasury data/guesses. (from Helmut's link)
Yet, we know that pennies mostly SIT in cash drawers, not being used all the time, or wrapped up in penny holders.
Many consumers quickly remove them from their pockets and store extra pennies in jars/piggy banks, out of circulation right?
That's why they have to keep minting so many pennies each year, and why the Treasury is thinking about not minting pennies someday, to save money.
It actually costs more to "make" a penny, than it's worth in actual value.
https://answers.yahoo.com/question/index?qid=20100107070401AAg60hC
But I goggled it and found an interesting answer on Yahoo someone was giving to kid who had an assignment where a teacher was asking how many coins are in circulation currently.
Best Answer: You should ask what he means by* "in circulation." And, for the USA, or for the whole world?
Do you eliminate the coins that are in piggy banks, or in storage* in banks, and the federal reserve?
What about coins in collections, or stashed away in coin books, not being circulated?
Given the fact that many silver coins were melted down when price of silver went up, and millions of coins have been lost, or thrown into "wishing wells", never to be seen again, for centuries, the answer he's looking for can never be very accurate.
I'd write your teacher a short answer explaining the "flaws" in his assignment, and instead substitute this answer:
How much money is in circulation?
Because that number is calculated weekly.
It changes weekly, just as the number of coins in circulation would change daily, or weekly.
Much of our money "circulates" only as electronic blimps, neither paper or coined money.
It is calculated as M1, M2, M3. and by other names.
Does your teacher want all them added up?
Or should you pick only one?
That's why there is no good answer for this question.
Read more about it at links below.
EDIT: At my second resource below, I read that 99 percent of money in circulation is federal reserve notes. That means that 1 percent must be coinage.
Another source said about 1 trillion USA bucks of different denomination are in circulation any week.
From that fact, one may interpolate that about $10,000,000,000 (ten Billion in coins--which is 1 percent of $1 trillion) would be coins circulation.
Second Edit: Helmuts links are good. I noticed that just one year, 2009, about 10 billion coins were minted, and about 250 billion since 2000.
But, this doesn't address problem of "how many still in circulation?"
I suppose that even the Federal Reserves figures on Helmut's first link of 2.58 Trillion coins is close to accurate, (except Helmut added three extra zeros to correct number) .
Yet, I do not know how the Treasury knows exactly?
So much business is done nowadays electronicly, coins are less important than years ago.
More than 1/2 of the total coins "in circulation" are actually pennies too, according to U.S. Treasury data/guesses. (from Helmut's link)
Yet, we know that pennies mostly SIT in cash drawers, not being used all the time, or wrapped up in penny holders.
Many consumers quickly remove them from their pockets and store extra pennies in jars/piggy banks, out of circulation right?
That's why they have to keep minting so many pennies each year, and why the Treasury is thinking about not minting pennies someday, to save money.
It actually costs more to "make" a penny, than it's worth in actual value.
https://answers.yahoo.com/question/index?qid=20100107070401AAg60hC
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