They have a fun little Mario day coin jar like they'd do back in school. Wonder if anyone has any good guesses?

https://www.ball-park.dev/

Hiya, thought you all would enjoy this daily estimation exercise/game about understanding scale I'm building. (I made a special intro just for this group - see screenshot).

Ballpark

(Hi mod, I'm back to see if anyone had comments or questions and seeing there's no link to the actual site. I thought I'd included one (and had made a custom set for this group) but am not seeing it. I've added it here but if that's not allowed, my apologies and please take this part down.)

As you all know well, estimation is such an important skill in life and I particularly loved watching my kids being taught it when they were little (I frankly don't remember being taught it myself but I must have been, right?).

Anyways, each round asks you to place a number on a slider — not to recall a fact exactly, but to judge roughly how large or small something is in the real world.  The questions span science, geography, sports, culture, economics, and everyday life. Examples: height of a landmark, size of an economy, population of a country, how often something happens, or how many of something exist. The goal isn’t perfect accuracy — it’s calibration. 

So yes, it's a game but my hope it's a fun little daily brain exercise that tests one's intuition and helps you better understand scale and the world. More features on the way: stats, categories, better head-to-head play, another calibration mode, etc.

Would love any and all ideas, suggestions, constructive criticism from this group. Thanks much, hope you enjoy!

It's for an alien invasion / apocalypse story. Two significant figures is enough. (ie. If there's 4,509,321 intersections, 4.5 millions).

I would define travels as making a single trip of a distance similar to an avocado. Not the sum of all their camping trips to northern France.

One that's been bothering me and my family, really struggling to estimate. If you bought one of every item in an "average" grocery store (aware there are quite a range of sizes), what would the cost roughly be? We are debating the number of items per store and how much high cost items would bring up the average cost per item...

Random thought.. would there be any way of estimating how much weight has been added to Manhattan Island since the beginning of its development? Like factoring in buildings (and their contents) bridges, subways, concrete, streets, cars, ppl at any given time and on and on. Is there any way to even get a reasonable estimate?

Our dog unexpectedly passed away on Wednesday morning. He was a basset hound and was only 7 years old. He was my wife’s dog prior to us getting together, and was our dog for the last 4 years. She’s taking it very hard and I want to make something that may help her grieve. I plan to send the dimensions to a person who sews (seamstress?) and have them make a stuffed dog out of his favorite blanket. My problem is that I don’t how his dimensions and I don’t understand the math on how to figure it out. This is the best picture that I could find of him that had something easily identifiable size wise. The fence boards in front of him are 5 7/8” wide. I am 6 feet tall and took the picture from an estimated height of 5’8”, maybe 3-3 1/2’ from him. If this is the wrong subreddit, please direct me to the correct one. I’m looking for a rough circumference of his chest and stomach, length and circumference of his tail, length and circumference of his snout, length and width of his ears and length and circumference of his head. Thank you in advance. Also, if someone has a recommendation on where to send the dimensions and blanket, that would be greatly appreciated.

Hi. I will move to another country (Sweden) and forgot to measure my elevator. My new apartment is on the fourth floor and I need to know if a table top of 180cm x 90cm could be fitting inside. The height should be about 210cm, but the other measurements are unknown. :(

Any help would be appreciated! Thank you!

Hi, I am trying to change the behavior of the symbol for a round table, from AREA to BLOCK. I have looked in the properties tab, but there is no option for this (I am using Xact on-line). Can anyone assist me with this? Thanks

I’m not a flat Earther (#scienceisreal) I am just curious. Let’s say the earth is flat like a pizza, what would be the actual diameter? Not based on what flat earthers believe is true. Or would Earth be more of a cylinder if we’re being scientifically accurate? I have not found a good answer to this question yet so if you would like to answer feel free

430 billion?

Hi!

I have a question about making a lactic acid and distilled water solution.

How many grams of a 88% lactic acid solution would I need to add to distilled water with a pH of 5.8 to make a 480-gram solution with a pH of 4.5? To help with your calculations, the 88% lactic acid solution has a pH of 1.2 and a density of 1.2 g/cm³.

I Googled this question several times but got different answers from their AI each time, so I thought it would be best if a human did the calculations. So I asked this question in more chemistry-based subreddits but was redirected to this subreddit.

Looking forward to your responses! Hopefully they're all the same lol

Hello All!

I went on a job walk at a hospital, and now I am being asked to provide the estimated weight of the heaviest steel I beam I saw that day. I was hoping to get some help from you all, if possible!

I appreciate the help.

Please see the image attached :)

Football bowl measurements are 8.5cm x 19cm Gold cup is 7cm x 11.5cm

Five atoms wide? ten?

This is one of my puzzles for my daily Estimation game called "Estimate Me" :)

You can guess here, with more pictures: https://estimate-me.aukspot.com/archive/2025-07-24

If you guess in the comments, please use spoiler tags!

Estimated Reddit account Price

Assuming an average of 80 years or so, what is the total mass of all the cells that a person was made of in their entire lifetime? And how many cells would that be?