r/calculators

The Premise

CalcByEA is a fully functional web calculator where almost every button is locked behind a paywall. You need to buy 'DLC packs' to unlock basic operations like addition, multiplication, and the equals sign.

The number 0 is free. Everything else costs money.

This is not a bug. This is the product.

It's satire on the video game industry's microtransaction model — specifically EA Games, who turned a $2 cosmetic DLC in 2006 (Horse Armor for Oblivion) into a multi-billion dollar monetization philosophy.

I built this as a mirror to the gaming industry. EA has been voted 'Worst Company in America' twice, and yet their model of shipping incomplete games and selling the rest as DLC became standard across the entire industry.

By 2021, FIFA Ultimate Team was generating $1.6B/year from digital card packs alone. The Sims 4 base game went free while the full content now costs $1,000+. Star Wars Battlefront II's loot boxes triggered government investigations into gambling laws.

So I asked: what if we applied the same logic to something universally free - a calculator?

Try it yourself. Try to add 1 + 1. See how far you get for free.

calculatorbyea.com

There is an absolute flood of counterfeits out there. It's getting ridiculous trying to dodge the fakes. I gladly came across a guy from Pune(India) selling one and took a chance. It was just delivered today, got it for around Rs 800($8).

Coca-Cola-branded conversion slide rule and Coca-Cola-branded conversion calculator

In the photos: calculator watch Casio CA-53WF-1B, cheesiness key chain abacus, slide rule tie clip Swank; desktop calculator Casio DJ-120D Plus, cheesiness abacus, slide rule addiator Faber Castell 67/54 Rb

It's curently streamed from my computer but i'm working to do it completely in local...

Ti-84 evo finally came 🙏

Personally I’m picking the nspire as the documents feature is so helpful and the mouse just makes everything so easy, if ti made a modern 89 that would definitely be my pick it’s one of the best out there

The one that seems more recent ( x 2025) is cheaper, but also what I've noticed is that the refular 'hp' one seems to have a larger display, and looks like it's a better model.

Shouls I worry about the difference?

Always loved calculators and especially watches with them. Only one left in my collection is my 80’s radio shack one. I do have a ti-89, and ti-83 too.

It only has 3 modes

Picked up this drawer queen off ebay. Don't think it was hardly used and included the QSGuide and cord. Love the larger screen and backlight option, similar to my Slim. Found the power graphic 2 version too.

Ideally, I was looking for the SD version. Which version has the most apps, SH3 or SH4? Also, can you store programs/apps on the SD card to run, or do they need to be in the calculator memory?

9860GII SD come in SH3 and SH4 (Power 2) with both being premium prices on ebay. Though Graph 95 (French version) are cheaper. Besides the test mode, are there any differences between the international 9860GII SD and the Graph 95? Does the Graph 95 have both SH3 and SH4 variants?

Thanks!

I need help coding the LinRegT-interval feature for my Statistic unit and finals. For context, my dumbass decide to save 40 bucks by buying a TI-83 Plus instead of a TI-84 statistic calculator. Because of this, there are many feature that I have to manually code into the program such as GOF test, T interval, and INV Chi. We are currently on the Regression lessons and was recently introduce the regression T-Interval procedure.

I used AI to code the exact code show in the images into the New Program button. After inputing the number in the two list, I run the program, inputted the list and was met with the err:Undefined. When I clicked on GOTO, it ended up on the *, next to the “a”. Can someone check if all the variables are defined, everything is correctly added and I am not missing anything.

If you need more information in order to help me, feel free to ask. (My grammar is buns 💔）

So my grandpa collected all sorts of weird tech dohickies and i found this calculator, its in mint condition never used as far as he knows but without a case or a charger.

after researching the calculator it appears its quite rare so im just wondering if its worth anything, thank you for taking the time to read!

UPDATE: No further help needed, thanks! I'll try to borrow another calculator for the exam and buy a proper battery afterwards.

Hi everyone, I'm in a bit of a stressful situation and could really use some advice.

My TI-Nspire CX II-T suddenly stopped working properly this morning. The battery completely gave out. The weird thing is, it was already a bit problematic when I first bought the calculator, but I managed to fix it back then and it worked fine for the whole 2 years. I honestly didn't expect it to die on me right now, especially just before my exams.💀

Now the issue is: I'm in Poland, the battery (37L1200SPB) is basically impossible to get fast locally and online orders might not arrive before my math exam (May 14).

The calculator only works when plugged in, but that's not a real solution for exam conditions. The battery itself also feels like it may be swollen, so I'm assuming it's completely dead. I'm trying to figure out what my options are at this point. I was even considering desperate alternatives like third-party batteries or temporary fixes, but I'm not sure what's safe or even workable.

Has anyone dealt with something similar? Is there any safe workaround to keep it working for a few days? Any fast sources for TI-Nspire CX II-T batteries in Europe/Poland? Or any emergency fixes that could at least get me through the exam?

I'd really appreciate any help or advice. I'm kind of stuck right now and running out of time.

Thanks in advance. 😭

I couldn't buy it, though, as the seller was asking too much for it, but I did get a photo of it.

After receiving this in an attic, this thing had an already chance but I still want to ask for your opinion on the matter.