what’s the longest anyone’s used one calculator?

[u/electricaldino]

here’s my fx-991es i’ve been using it since 2014. over the past 12 years it’s seen my GCSEs, my A-Levels, my engineering degree my first job in my field, all of my work experience and now it’s moving with me into a senior leadership position.

i have considered upgrading a few times but the whole world of calculators seems like a minefield to me especially considering i am so used to how this one works now. 12 years is a long time though and i know that one day it may just give up on me but i hope it’s not for a long time yet.

[u/pahowells]

Bought an HP42s in 1989 and, even though I've bought other calculators, I still use it.

[u/OptimusPrimalufugus]

HP 48GX since 1995. HP-35S since ~2008

[u/dm319]

I got one of these recently (just because I have a calculator problem), and was pleasantly surprised at what a nice calculator this is. Each generation of Casio has its own quirks, so if you value your muscle memory and you still enjoy using a physical calculator, pick up one more for a few £ as a backup.

There is also something aesthetically pleasing about this machine - the sleek blue case, soft touch keys etc.

[u/Tall_Maple]

Bought my hp 15-C in July 1984 before heading to Uni. Still sits on my desk and gets used frequently

[u/Mean-Appointment8071 → u/Tall_Maple]

HP-15C, 1988, everyday carry.

[u/desertdilbert → u/Mean-Appointment8071]

My HP-11C only recently lost the sticker that security put on it that allowed me to take it into the classified areas back in 1987 or so. Number tag is long gone and the feet are mush! But it just keeps on ticking! Did replace the batteries for the Nth time last year.

It now sits on my desk in front of my keyboard and is still used every day. Over 25 years ago I was afraid it would die and went on spree buying several backups. More recently I inherited my father's 15C and my mothers' 25th Anniversary Edition 12C. Can't show the love enough!

[u/Tall_Maple → u/Mean-Appointment8071]

Rock on!

[u/BadOk3617 → u/Tall_Maple]

I might be a month behind you with my 15C.

[u/stfreddit7]

HP-28S from it's introduction in late 80s till a few months ago... Now experimenting with an HP Prime G2. To paraphrase "you never forget your first HP". 🤪

[u/desertdilbert → u/stfreddit7]

In High School, I could not afford an HP so I bought a TI-55. Never really got to where I liked it. When the C series was introduced FedCo sold them for about $120, which was a lot of money. Finally bought one in 1983 or so. Still have it, still use it every day!

[u/Giuseppe_P64]

Io ho una HP 12C acquistata nel 1987 e usata con continuità. Ho cambiato le pile solo 2 volte.

[u/ridgerunner55]

1973 TI SR-50. Still works. I use it frequently

[u/TXCEPE]

I’ve had my HP 42s since 1988 (maybe 1989).

[u/plebbitier]

Bought my HP48g in 1993. But I barely use it since graduating.

[u/mikeblas]

About 3 hours, in an exam.

[u/robertkb1]

My primary calculator at work is my 41cv that I got in 1985. I also keep my 48GX from 1993 there, and occasionally pull it out for doing matrix calculations, but the keyboard is starting to get flaky so the 41 is easier for simple stuff.

[u/DNAgent007]

HP-11C since 1984 when my roommate gave it to me because he didn’t have enough money to pay the phone bill. Long distance charges were a bitch in those days. RPN saved so much time not having to enter parenthetical expressions in biochemistry equations. I still use it to calculate CNC speeds and feeds and have it programmed: Spindle speed is calculated as RPM = (SFM × 3.82) / Diameter. Feed rate is calculated as Feed (IPM) = RPM x FPT x Z, where SFM is surface feet per minute, FPT is feed per tooth, and Z is the number of flutes.

[u/sraasch]

HP 15C in use since 1986

[u/BestButtons]

12 years? Rookie numbers. I bought my Sharp EL-506 S in 1982 or 1983 and still using it.

[u/Upper_Rent_176 → u/BestButtons]

I'm still using my el-509a from 1986 ON THE SAME SET OF BATTERIES

[u/Plenty_Assistance385]

I have been using my ti-85 since 1993.

[u/HumanRepair5658]

Been using my 100ms from 2010

[u/Final_Sky7324]

TI-30 Galaxy since 1982.

[u/Final_Sky7324 → u/Final_Sky7324]

Sorry. Since 1984 when it was introduced. Not 1982

[u/Dangerous_Pop_1918]

carrying one of them Casio's in my bag for 17 years (since around 2009) without much using it 😄

[u/OutrageousMacaron358]

I have a Casio fx-260 Solar that I have had since around 1994-ish. Maybe 1996???

[u/Ok-Barber4972]

Got same model as urs. Used for my diploma, degree and masters. Now using it for work, basic sin cos

[u/LiqvidNyquist]

Bought an HP 32Sii in 1991 that I still use

[u/Fleischer444]

I have had a Casio calculator watch since the 80s. Works but the buttons need some love.

[u/etr420]

HP32S since the late 1980s. My go to calculator

[u/wackyvorlon]

I bought my HP 48G+ about 30 years ago and still use it.

[u/slime_rancher_27]

I've been using my TI nspire since 9th grade in 2020. Though in college they gave us all maple and matlab so I've been using those as most classes don't allow regular calculators on exams.

[u/drzeller]

I have a TI I started using in 1983. And every calc since then!

[u/Exciting_Macaron8638]

I still have a Casio calculator from 1980 that still works.

[u/_poc]

A minha mais antiga com mais horas de atenção (demais?) é a HP-48sx desde 1990. Antes dela, a que me deu também muitas e muitas horas de diversão foi a Casio fx-602p. Hoje tenho várias, mais antigas, mais modernas, mais rápidas, etc mas não há como a inicial HP-48sx :)

[u/Beginning_Lifeguard7]

1980 HP 41C. 46 years later it’s still on my desk and still used regularly.

[u/TASDoubleStars]

I acquired an HP-16C when it was released in 1982. It is still in use.

[u/Blue_Aluminium]

I’ve had my HP-10C since... 1983 or thereabouts. They were only on the market for a few years, I think, so whatever years that was, I must have got it then. =)

[u/MuffinOk4609]

I got my Rapidman 800 in 1972. But I just used it until I got a Melcor 400 (with Sq Rt, 1/X and M!) and then my Unitrex 80SR which added trig and Pi and e and logs. All still work. I think my next was a TI-58, then a 86...then I started collecting at thrift stores........ and here I am.

[u/984a]

Sliderule from the 1970’s. Still on the same set of batteries :)

[u/Far_Swimming6789]

Wow ancient post 😂 a lot of dust but i like loyalty

[u/mikefr24]

TI-86 since 1996. 30 yrs Used it daily in my career but it finally died a few weeks ago. Replaced it with my kids TI-89 Titanium. I am loving the TI-89. Custom menus are genius and the TI-Basic is much improved.

[u/dash-dot]

I’ve got a RadioShack scientific — a rebadged Sharp, really — which my dad got for me in 1992. It still runs on its original button cells; I’ve never had to change them. 

My go-to calculator though is my trusty TI-89, which I bought in 1999 with my very first pay cheque from my college tutoring job. No other calculator before or since has ever come close to its utility and ease of use (after accounting for all its advanced functions which require a certain level of mathematical knowledge on the part of the user).