Buy It For Life
Calculators

Updated Jul 30, 2026

Buy it for life: the most durable calculators,
according to r/BuyItForLife on Reddit —
recommended by people who have owned them for years. How we pick.
Do you know of an item that should be on this list? Let us know!

Texas Instruments TI-83 Plus

Long-lasting graphing calculator widely used in school, teaching, and even later professional work.

Lasts for decades
Familiar and easy to use
Useful for school and work

Agreed, best calculator I’ve owned.
– barnaby14

Still using my plain TI-83! Still perfect all these years later.
– herp_de-derp

I still have my TI-83 calculator since highschool and used it all through college
– NoirGamester

HP 12C

Legendary financial calculator prized for RPN input, durability, and excellent key feel.

Excellent for finance calculations
Rpn workflow is highly valued
Durable with great buttons

There is nothing out there that compares if you are a finance weenie.
– WeirdEngineerDude

The HP 12-C is legendary.
– PhotonTrance

they are the gold standard in finance.
– Ctmarlin

Texas Instruments TI-108

Basic solar classroom calculator remembered for decades of dependable use in schools.

Very long-lasting
Solar powered
Good everyday basic calculator

Still, an excellent daily-use calculator at 30 years old, and will probably last decades longer with a bit of care.
– NowThisIsHappening

We used these in the late 80s in elementary school. They were great.
– miggitymikeb

I still have mine!
– erratic0101

Texas Instruments TI-30X

Reliable scientific calculator commonly allowed on exams and useful well beyond school.

Long service life
Works for exams and careers
Dependable everyday use

That’s the exact calculator I got for college and now use every day in my real adult job as a consulting engineer.
– Adept_Duck

I just had to put a new battery in mine this year. I got it when I was in 7th grade and I'm now 11 years into my career.
– dscelite

This calculator is a beast. Bought it in 7th grade for Algebra. Still sits on my desk 20 years later.
– boostfurther

Casio fx-991EX

Feature-packed scientific calculator praised for advanced functions and strong value for money.

Very capable for a scientific calculator
Allowed on many exams
Excellent value

Hands down the best calculator I've ever used and I've tried a ton.
– chunwookie

Casio fx991 was undeniably the best out of all of them.
– chunwookie

Well, who wouldn’t want to flex their Casio?
– bloodyveteran

Available at www.casio.com

HP-48GX

Highly regarded advanced calculator admired for longevity, power, and RPN-based workflow.

Very durable
Powerful advanced features
Beloved by rpn users

My ~20 year newer HP 48GX still works fine although the display is hard to read.
– supern8ural

Here for the HP nostalgia. My HP-48GX from 1996 still works. RPN! RPN! RPN!
– unknown

my 1993 vintage HP48GX is still going strong too. love that calculator
– drtwist

Available at porterelectronics.com

Back to Electronics

Sources:
TI-83 plus. Used this exact calculator when I was in high school and now use it to teach high school! Going on 19 years of ownership!
My dad is retiring today. He’s used this HP Finance Calculator almost daily since the late 80’s.
I’ve had this Texas Instruments scientific calculator since 6th grade, it’s now getting me through finals in my first semester of college.
A calculator my co-worker has owned for 40 years...
Enough with the calculators already. It is fast becoming apparent that pretty much every single calculator doesn’t use a lot of power and so long as you don’t loose it will work forever
HP 10bII+ Calculator. Going 10 years strong from a college finance class to now. Calculator Apps are no comparison.
HP12C Financial Calculator given to me October 1988 when I started a new accounting job. Almost 30 years later, still doing the job!

Buy It For LifeCalculators