How this instrument works
The quarter has carried George Washington's portrait since 1932, chosen specifically to mark the two-hundredth anniversary of his birth and replacing the Standing Liberty design used since 1916. Except for a 1975–1976 Bicentennial reverse featuring a colonial drummer boy, Washington's portrait has appeared on every circulating quarter minted since, making it one of the most consistently produced coin designs in US history.
Between 1999 and 2008 the US Mint ran the 50 State Quarters Program, releasing five new reverse designs a year, one per state, in the order each joined the Union — the most successful coin program in US Mint history, which shipped 34.2 billion quarters to the Federal Reserve over the decade, well over double the 14.8 billion shipped in the ten years before it. America the Beautiful Quarters followed from 2010 to 2021, and American Women Quarters ran from 2022 to 2025, keeping the reverse design rotating well into the coin's second century.
The quarter earns its keep in machines. Laundromats, parking meters, vending machines, arcade cabinets and toll baskets have standardized on the 25-cent coin for decades, in part because its size and weight — 24.26 mm across, 5.67 grams — make it easy for a coin-recognition sensor to distinguish reliably from a dime or nickel, a practical role no other US coin denomination fills quite as consistently.
- Enter a count into the Quarters field — 12 is preloaded to show the ×0.25 factor at work.
- US dollars updates instantly, always your quarter count divided by exactly 4.
- To reverse it, multiply a dollar figure by 4 to see how many quarters it represents.
- A standard bank roll holds 40 quarters; enter 40 to confirm it equals exactly $10.00.
Worked example — 12 quarters for a $3.00 laundry cycle
A laundromat washing machine costs exactly $3.00 and takes only quarters, so a customer counts out coins from their pocket to feed the slot. Entering 12 into Quarters returns 3.0 in US dollars — confirmation the customer has exactly enough before dropping a single coin in, with nothing left over and no need to break a bill for the last few cents.
The same ×0.25 factor scales to any count: 7.5 quarters, a fractional amount only meaningful when averaging or estimating, converts to $1.875, and a single quarter converts to exactly $0.25. Multiply 3.0 back by 4 and the count returns to 12 quarters precisely, matching what the customer originally counted out.
Questions
How many quarters make a dollar?
Exactly 4. A quarter is worth 25 cents by definition — one-quarter of a dollar, literally — so four of them always sum to $1.00, a relationship fixed since the coin was first struck in 1796 and unrelated to whichever of its many reverse designs a particular coin happens to carry.
Why is George Washington on the quarter?
The Mint put Washington on the quarter in 1932 to mark the two-hundredth anniversary of his birth, replacing the Standing Liberty design used since 1916. Apart from a special Bicentennial reverse used in 1975 and 1976, his portrait has appeared on every circulating quarter since, making the coin one of the most visually consistent in US currency.
What was the 50 State Quarters Program?
A ten-year US Mint initiative, running 1999 to 2008, that released five new reverse designs a year, one for each state in the order it joined the Union. It became the most successful coin program in Mint history, driving quarter shipments to the Federal Reserve up to 34.2 billion coins over the decade, more than double the 14.8 billion shipped in the previous ten years.
Why do vending machines and parking meters use quarters?
Mainly size and consistency: at 24.26 mm across and 5.67 grams, the quarter is easy for a coin-recognition sensor to distinguish reliably from a dime or nickel, and its 25-cent value divides cleanly into common prices. Decades of standardizing on the quarter for laundry, parking and arcade machines has made it the default coin American machines are built around.
How many quarters are in a standard bank roll?
40 quarters, worth exactly $10.00 — the roll size US banks and the Federal Reserve use for quarters, different from the 50-coin rolls used for pennies and dimes because a quarter roll is sized to reach a round $10.00 total rather than matching those coins' roll counts.
What quarter design programs came after the state quarters?
America the Beautiful Quarters ran from 2010 to 2021, featuring national parks and other federal sites one per state and territory, and American Women Quarters followed from 2022 to 2025, honoring notable women in US history. Washington's portrait has remained on the obverse throughout every one of these reverse-design rotations.