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Posted by blenderob 1/7/2026

A4 Paper Stories(susam.net)
387 points | 185 commentspage 2
tolerance 1/7/2026|
Paper Towel stories:

I’ve started to determine the right package of paper towels to purchase according to the cents per square meter value. You can discern the quality of a deal at the grocery by referring to the ‘cents per X’ market located on price tag next to the marked price.

I’m beginning to turn sour on the ‘2 Jumbo-Mega-Rolls are the equivalent of 8 Super rolls’ scheme that’s en vogue. Are there retractable roll holders to accommodate for all of this?

It doesn’t help that many of these packages are priced and then marked down in ways to entice the buyer toward purchasing them instead of more reasonably priced and proportioned ones.

Ekaros 1/8/2026||
With paper towel I have been thinking that the area might not be important, but the number of sheets would be. As long as they do not get too small. And then there is also the quality and if they are half or full. For some uses you just want the full.

It is complicated area. Not to even get to loo roll. Where I noticed that the ecological one I bought feels quality wise inferior to normal one. And this is premium type of stuff. So it sits between the premium and cheap, but more on premium end.

necovek 1/9/2026|||
As mentioned in a sibling comment, weight might need to be accounted for too: thicker paper is more absorbant, but not linearly so.

So really, how absorbant the paper is should be the gold standard, so let's ask manufacturers to put that on the packaging?

tolerance 1/10/2026||
Manufacturers already indicate to the thickness of their paper with ply count: <https://blog.whogivesacrap.org/home/difference-ply-toilet-pa...>.

Although that doesn’t speak to the actual quality of the individual layers of paper. I’m not sure if weight is useful especially when manufacturers are already putting their thumb on the scale in other ways with the ‘2 Jumbo-Mega-Rolls are the equivalent of 8 Super rolls’ scheme that I initially referred to.

If all weight can tell me is that 2-Jumbo-Mega Rolls weigh the same as 8 Super rolls am I any better informed?

This is why I’m pretty content with using the price in cents per square foot as a baseline. In general it’s a useful metric when shopping elsewhere at the grocery store too.

fragmede 1/7/2026|||
The worst is that the assumption that the greater quantity is cheaper per unit, but for some reason that's not always true so you have to sit there and do the math in order to get the best deal.
fainpul 1/7/2026||
Since not all paper is of the same thickness, shouldn't you compare "weight per price"?
Aryezz 1/7/2026||
Maths Youtuber Noel Friedrich recently made a video about A4 paper[0]. It turns out that since the ISO specification rounds the side lengths down to whole millimeters, with compounding errors, more than 2^10 A10s (smallest paper size in the standard) fit into one A0 (largest size in the standard).

[0] https://www.youtube.com/watch?v=zDKBCIMkDbw

tveyben 1/7/2026||
Ha - I have made so many measurements using an A4 with great accuracy that this monitor-story might as well have been me :-)

I never understood the US paper size system while living there (or since...!), don't get me started with feet and inches and 16'ths etc - ISO, metric and base10 is just so much more logical and easy to use...

lewisjoe 1/7/2026||
I use my phone when I want to measure stuff. Not an app, just the physical phone as a ruler. Almost always the dimensions of whatever phone I've got is published on the internet. It's a quick hack and better than carrying around A4 papers ;)
felurx 1/9/2026||
I've participated in (and now have been a ref for) a robotics competition, First Lego League, a couple of times. The robots can have a height of up to 30.5cm (12"), and that's usually quickly checked before each round.

Since there's pretty much always some A4 paper lying around near you, probably a copy of the rules, in most situations we just hold up a sheet (rolled up if you're feeling fancy) next to the robot. Much quicker than finding the ruler that's probably in use (or misplaced) somewhere else :D

xp84 1/8/2026||
Pythagoras would appreciate her usage of his theorem, but I'd have just laid my papers diagonally across the screen to measure it directly without computing any square roots. Since I'm a yank, 11 + 11 + 5.5 would do quite nicely.
zabzonk 1/7/2026||
At one point on an international project I had to fly a box of UK A4 to the USA in my luggage so the Americans could check their software could cope with the different size. It did, but lugging it around was a pain - paper is heavy!
mitthrowaway2 1/7/2026||
I wish we could buy A4 paper in North America! I find it surprising it's not available even in specialty stores. The rest of the world uses it!
bombcar 1/7/2026|||
You may need to look for 8.27" x 11.69" - https://www.staples.com/hammermill-copy-plus-8-27-x-11-69-co...

Or you can buy a ream of legal-size and have a printshop slice it down (which is how I got ahold of B4 or B5 IIRC).

tanjtanjtanj 1/7/2026||||
I don’t know what specialty stores you’re talking about but A4 is readily available at most stationary stores, or anything related to letter writing, pens, or paper. I got the A5 notebook I’m currently using at Barnes and Noble, they also have A4.

Heck, I’m pretty sure you could get a sheaf of it at any number of office supply stores right now if you wanted.

lproven 1/7/2026||
* stationery :-)

Unless you have mobile paper shops. Could be handy, but seems a bit niche.

tanjtanjtanj 1/8/2026||
Well I've never seen one move!
slowmovintarget 1/7/2026||||
For printers?

I buy A4 notebooks all the time. I use fountain pens, so many of the notebooks and even loose paper with the proper sizing (coating, that is) usually come in EU sizes. Tomoe River... Clairfontaine... etc.

kevin_thibedeau 1/7/2026||||
Kodak used to have an industrial printer partnership with Heidelberg. They would test their printers with pallet loads of A4. Most I've ever seen in the US.
ExoticPearTree 1/7/2026|||
Yo do know all the jokes about how the US would anything as a measuring system except the metric system? Same with paper.
sitharus 1/7/2026|||
I had the reverse, we had to get a ream of US Letter and corresponding envelopes sent over so we could ensure the layouts printed properly. Also some chequ… “checks” which were fascinating.
mystifyingpoi 1/7/2026||
Couldn't they... just cut it according to A4 dimensions?
zabzonk 1/7/2026||
An interesting question, but I think it would be very hard to do it accurately. Also, some of the reports the needed to print during testing were looong.
sam_goody 1/8/2026||
While this is nice, it is not inherently related to an A4 paper.

You could have memorized the length of a cheapo Bic pen if that is common in your area; Or a Parker or a Monte-Blanc if you carry one of those.

All recent iPhones (regular models since `03) have a width of 71.5mm. Remember that, and as long as someone near you has an iPhone, you are good to go using it as a ruler. (And people will definitely be, um, impressed).

We have in my kitchen several brands of small forks, all are 19.2mm (just checked. The large forks have a range of sizes). Next time I need to measure something I could just request a fork...

avalys 1/7/2026||
Yeah, I’ve used a sheet of paper as a ruler too...

As regards metric/A* paper sizes, it seems like just a coincidence that this scheme resulted in a standard size that is useful for everyday documents, since it only works for powers of 2 and starts with the definition of 1 square meter. If a meter were 1.5x smaller or larger, then I don’t think there would be a standard size that works so well.

EDIT: Being curious about this, I did some more reading, and discovered there is a “B” series of paper sizes that maintain the same ratio relationship, but are exactly in between all the A sizes! That’s useful.

saalweachter 1/7/2026||
The creators of metric weren't above buggering it to fit human scale needs.

Take the length/weight relationship.

Definitionally, it'd be way more elegant for the unit of mass to be based on the unit of length directly, a cubic meter of something, but having your base unit of mass be a ton wasn't going to fly.

So they instead tried for 1/100th of the meter and landed on the gram, but it turns out they misjudged and now your standard unit of weight is the prefixed kilogram instead, because everyone used kilograms instead.

Which is to say, if you didn't get a pretty good paper size out of the definition used for A0, someone would have found a different definition which did produce a pretty good paper size, and then declare it was the only natural one.

kijin 1/7/2026||
I don't think anybody loses sleep over the kilogram issue because, well, it's metric after all. A kilogram is exactly 1000 grams, so the gram is just as perfectly well defined. Nothing would really change if they were to promote the gram to be the standard unit of mass (not weight!) someday.
Ekaros 1/8/2026||
I am annoyed by it. We should be using gravs instead. Then there would not be this special unique unit with prefix as base unit.
saalweachter 1/13/2026||
I was actually unfamiliar with the history of the grave: https://en.wikipedia.org/wiki/Grave_(unit)
silvestrov 1/7/2026||
There is also a C series of sizes which are slightly larger than the A sizes and therefore useful as envelope sizes.
neilv 1/7/2026|
Elegant, sure, but... fold a sheet of US Letter (8.5 x 11.0 inches) in half, and you're on your way to a pirate hat. Fold and pull it several more times, and you have a boat.
shmeeed 1/8/2026|
You can do the same with A4, of course. Metric and imperial pirates will have to battle it out.
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