Before we find how many pennies deserve to fit in one square foot, we should ask part questions...

You are watching: How many pennies per square foot

any minimum room required in between pennies?what pattern?are there sides to the square foot and no penny deserve to overlap any edge?other

Let"s begin with a piece of cardboard that steps 12 by 12 inches, i beg your pardon is specifically 1 SF. As you have the right to see in the pictures, the ice measure reflects we have 12 in. On both sides, also though it might be hard to check out the little numbers.


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We begin placing pennies ~ above the leaf of this 12 in. Cardboard and also it results in a perfect fit: 16 pennies next to each other measure precisely 12 inches (one foot) due to the fact that the diameter that a penny is .75 in. (or 3/4 of an inch).

By the way, together you can see, we used all brand new pennies because that this demonstration.


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1 SF cardboard and 16 pennies ~ above its edge
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Simple math deserve to tell us exactly how many pennies fit in one square foot in this straight pattern (16x16=256) without in reality filling the square cardboard through pennies. We chose to carry out it quiet in stimulate to present other details and for you come see how beautiful the looks. Here we go, adding row after row of 16 pennies each. 

Worth mentioning here is that the pennies carry out touch every other. If a gap/space is required all approximately each penny, say for grout, changes must be made.   


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Slowly adding up pennies...

So, how many pennies can fit in one square foot?256 pennies every square foot if the rows room straight

No penny overlaps any kind of edge and there"s no an are left whatsoever - at least that"s what mathematics tells us. If you view slight imperfections in the snapshot below is due to the fact that we put all 256 pennies by hand and also they are just sitting there, not glued.

If a penny was square shaped rather of round, with a .75 in. Side, the cardboard listed below would be totally covered by 256 square pennies. But since the coin is round, you deserve to see the cardboard in between pennies.

Notice the empty area between any 4 pennies is quite huge and has actually 4 rounded sides (more on this later).After closely placing every coin by hand, right here it is: 16 rows the 16 pennies each.


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16 pennies per right row x 16 rows = 256 pennies

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Here"s a close-up top top a edge of the square cardboard. Even though the pennies room in contact with every other, there"s still fairly some room in between them and that"s as result of the directly rows pattern/layout. 


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Close-up on directly rows the pennies

And here"s one more view the the same 256 brand new shiny pennies sitting in directly rows on a precisely one square foot cardboard.


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256 brand new pennies on a 1 SF area
How plenty of pennies deserve to fit in 1 sq. Ft. If we adjust the pattern to staggered/offset rows?

The an initial row the 16 pennies stays the same and we relocate the second row come the right by half a penny. Climate we deserve to also push up (as girlfriend look at the picture) the whole second row till it touches the first row of pennies.

We"ll press every even numbered row (2nd, 4th, 6th, ...) to the ideal by fifty percent a penny and then the totality row increase a little to touch the previous row. V every row thrust up a little, us should gain some room at the bottom the the cardboard.


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Beginning that offset/staggered rows that pennies

Here"s more of a visual: advertise a row by fifty percent a penny (A) outcomes in half a coin overlapping the leaf of our square foot (B). 

Overlapping can"t occur if your specific one square foot (SF) project has actually sides/walls like a tray. And also for larger projects, each SF of pennies can overlap ~ above the following SF until you with the finish side of her project and cannot fit one more full penny anymore.

So, pushing 8 rows to the ideal by fifty percent a penny and also then up a little, our 16 original rows of pennies gained "squeezed upwards" closer together and also revealed quite the extra room (C) in ~ the bottom the the cardboard.


Can us fit 2 an ext rows of pennies there? We sure can. Not just that yet there will certainly be a little bit of room left after that which we"re not going to (mathematically) get into, yet some more "slices the pennies" will certainly fit in the small room left below. 


There we have actually the 2 extra rows of pennies (above) and room left because that "16 slices that pennies" aligned v the cardboard"s bottom edge.

How around the optimal side that the cardboard? another 16 super tiny "slices the pennies" will certainly fit in there, aligned through the edge, to make our square foot... Full.

And the overlapping pennies ~ above the right side, compensate for the empty spaces top top the left, therefore no more explanation necessary here.

Easy math provides us the total variety of whole pennies (18x16=288) plus part 16 "slices the pennies" in ~ the bottom of cardboard and also another 16 small slices in ~ the top.

The subject of "How many whole pennies are in the 32 slices" can it is in the title of a new article i beg your pardon is beyond the purpose of this page. But if you"re a genius mathematician who wants to provide it a shot, let united state know and we"ll publish your article and also give you the credit.

A rapid eyeballing states that the 32 slices can make up for about 6-8 pennies but let"s wait for Einstein"s confirmation.

Here"s the humble conclusion...

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Pennies per square foot (sf) in offset pattern:288 plus around 6-8 pennies "sliced" at height & bottom the cardboardThe complete could be 294-296 pennies every SF

What if her perfect square foot was a tray (or similar) through edges/sides which don"t permit pennies to overlap... Choose the 9 pennies execute in the over or below picture.

So what then? Someone might say "let"s reduced the 9 overlapping pennies in half and fill the left side with the 9 halves". We totally advise versus cutting pennies. Simply, not encompass the 9 overlapping pennies and the right side will be the same to the left.

Also, slide the whole thing down so the top and also bottom will have actually identical spaces to the edge of the square foot. Pennies every SF is 279 in this instance (288-9=279).