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HP 35s Scientific calculator

Mfg # F2215AA#ABA CDW # 1283605 | UNSPSC 44101800

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Get the flexibility no other scientific calculator can offer! Our 35s Scientific Calculator lets you choose RPN or algebraic entry-system logic (no other scientific calculator offers both). It also features a large, two-line alphanumeric display and adjustable contrast, plus a robust library of built-in functions and constants.

Choose RPN or algebraic entry-system logic

Work efficiently with the keystroke programming

Efficiently tackle heavy workloads with the 30KB memory and 800+ independent storage registers

Store an equation, then use it again to solve any variable using HP Solve, or employ any of 100 built-in functions

View entries, results, menus, and prompts with ease on the large, two-line display with adjustable contrast

Simplify physics with the 42 built-in physical constants

Get peace of mind with the one-year limited warranty plus HP Total Care advice and support

Specs
Display size: 2 lines x 14 characters + indicators

Display Type: LCD

LCD: 14 character dot matrix (5 x 7) x 2 lines + indicators

Contrast: Adjustable

Entry-system logic: RPN and Algebraic

Built-in functions: 100+

Menus, prompts, etc.: Yes

Internal precision: 15 digits

Memory: 800+ Memory registers; 30KB

Keyboard: Alphanumeric

Power: 2 x CR2032 batteries

Power off memory protection: Yes

Battery life: 0.73 year @ 1 hr/day (approximately 9 months)

Weight: 125 g (4.4 oz)

Size (L x W x D): 15.8 x 8.2 x 1.82 cm (6.22 x 3.23 x 0.72 in)

Enclosure material: Plastic, metal faceplate

Key top material: Plastic

Warranty: 1-year warranty (may vary by region)

Subject suitability: Engineering, Surveying, Science, Medicine

Permitted for use on: SAT® Reasoning and SAT® Subject TestsTM in Math 1 and 2, ACT, PSAT/NMSQT, AP Chemistry/Physics, PLAN, EXPLORE

What's in the box Calculator, batteries, user manual, premium protective case

This item was discontinued on August 31, 2021

Enhance your purchase

HP 35s Scientific calculator is rated4.54 out of5 by46.
Rated 5 out of 5 by from not a good survey toolI have just gotten the 35s and started playing with it. I am not impressed at all in comparison to the 33s due mainly to the fact that the key stroke is to long for some of the simple functions such as polar req.. I think this function has to many key strokes for my field hands to be productive and to keep them from getting comfussed and the display of the distance and the angle on the same line is to easy to misread in a high pressure fast paced work envirment. I also noticed that my programs will have to be modified from the way they are imput into the calculator whereas when the switch was made from the 32s to the 33s there were no changes needed to them. This calculator will do everything you need to do but it just isn't user friendly which means a lot when you have people working for you in a fast paced high end industrial construction work place.
Date published: 2009-05-19T00:00:00-04:00
Rated 5 out of 5 by from PROGRAMMING PROPERTIESThere are two specific points agains this calculator: 1) It is not true that had 800 registers in addition to the 30k of RAM. This was confirmed by the manufacturer. You can use until 800 register but you will reduce drastically the amount of memory avilable for programming lines. 2) Run very slow. The zilog 8502 processor looks that do not run at 75 Mhz as specified. The old Apple II plus with CPM card used this processor at 2.0 Mhz and was faster.
Date published: 2008-12-23T00:00:00-05:00
Rated 5 out of 5 by from Love RPNI've been using HP RPN calculators for well over 20 years. In my opinion, any serious science or engineering student will be very well served by this device. This is the machine of choice in today's market.
Date published: 2017-07-21T00:00:00-04:00
Rated 5 out of 5 by from good for surveyorsthis is a relly good instrument you have to check that out.
Date published: 2008-04-04T00:00:00-04:00
Rated 5 out of 5 by from Excellent product!I have owned over a dozen HP calculators starting with the HP-35. The 35s and the 45 were/are the best of the lot.
Date published: 2013-01-20T00:00:00-05:00
Rated 5 out of 5 by from this is it for RPNI bought several of these in case they stop making them or at leastcalculators like these. The 35s has a classic feel to it, and more featuresthan I'll ever need. Two lines of stack display is nice to have compared toclassic HP. The zipper clamshell is a nicer case to have; these camewith a sleeve type case from which you must fully remove the unit to use.Battery life just OK. Top edge of the screen (some tiny icons there)can be hard to see without good light at just the right angle. But Idon't think there's a better calculator, and for RPN I think it's the only gamein town (aside from the 33S which has a casio look to it, and a coupleof expensive HP graphing calculators).
Date published: 2011-08-26T00:00:00-04:00
Rated 5 out of 5 by from FinallyAn hp calculator in the true sense. Form and Function in the way that made hp famous. Good Job.
Date published: 2008-10-18T00:00:00-04:00
Rated 5 out of 5 by from Venerable RPN is great, but . . .I can't stand how often I have to replace the inconvenient CR2025 batteries. A real pain!
Date published: 2019-09-08T00:00:00-04:00
Rated 5 out of 5 by from Excellent educational gift.I purchased the 35s as a gift for one of my former students. With this HP product, he can hone his skills further. He is already familiar with the 33s. His future for success is a little brighter.
Date published: 2019-12-24T00:00:00-05:00
Rated 5 out of 5 by from My HP 35sIt's great to know I can still get a calculator with RPN!
Date published: 2019-11-08T00:00:00-05:00
Rated 5 out of 5 by from Nice CalculatorWas hoping to replace my 42S but they are not made anymore. Only have couple days of use. The 36S is larger and lacks the quality feel of the 42S. Keyboard has crisper more tactile snap when key is pressed compared to 42S. Like being able to enter fractions directly, nice feature when adding or subtracting measurements. Fraction mode good is someone needs to borrow it.
Date published: 2020-03-05T00:00:00-05:00
Rated 5 out of 5 by from Fast and very capable.Recent purchase, so made in the Philippines and no keyboard errors. Very capable calculator with 10x more memory and much faster processing than older models. Crisp chicklets (keys). Longevity unknown, but less capable older models used extensively for 20+ years. Life and technology move on.Also own 30th anniversary 12C which operates flawlessly; very pleased with 12C and 15C apps. Very satisfied with the form and function of the purchases.
Date published: 2020-01-08T00:00:00-05:00
Rated 5 out of 5 by from HP outpreforms All others for the money you pay!!!I have always loved HP Scientific Calculators and I love the HP 35s model as well. I am showing my age when I say; I used to have to load Engineering programs by keying the whole program by hand each time that I needed to use it. I just can't remember the model #. I won't live long enough to use the HP 35s to get maximum usage from it. I am 71 years OLD next month!!!
Date published: 2019-09-12T00:00:00-04:00
Rated 5 out of 5 by from rectangular polar functionthe rectangular to polar function is awkward to use in non program mode.
Date published: 2009-01-10T00:00:00-05:00
Rated 5 out of 5 by from GreatThis is the closest I can come to the HP45 that got me through engineering physics. I worked two summers to raise the cash for the 45 back in the day. RPN, two line display, functions beyond 1975 imagination, and batteries that last 30 months, not three hours.Living science fiction.Cool.
Date published: 2012-05-11T00:00:00-04:00
Rated 5 out of 5 by from My Favorite Tool By FarI am a College Student who grew up with a dad who has been a loyal hp fan ever since his first calculator, The 41CX. My dad is an Electrical Engineer and he always helped me with my math. after a long time, I too have decided to follow the path to become an Electrical Engineer. When my dad found out he decided buy me my own hp calculator for College.Ever since the first time I got my hands on the hp 35s, I have not been able to put it down. Homework began to be fun due to my interest in learning to use it better, and have really grown in my confidence as a young mathematician.*The hp 35s is based around the "RPN" entry system rather than the "Algebraic" mode used by most other calculators (that aren't hp's).This entry system takes a little while to get used to, if your not familiar with it.- it took me around half a semester (3 months) to get comfortable with it-Great calculator, super powerful, awesome feel, beautiful to look at,all around it is my favorite tool for engineering by far!I seem to learn something new about it everyday.If you have previously owned an RPN hp calculator, consider this your back up.Great purchase.Thanks hp ;)
Date published: 2011-01-28T00:00:00-05:00
Rated 5 out of 5 by from The World's Best Pocket CalculatorIt's the best calculator in the world today!For anything more complex - use a spreadsheet.
Date published: 2009-09-17T00:00:00-04:00
Rated 5 out of 5 by from HP35Sthe calculator is OK but the 0 key doesn't always work. Sometimes I have to push it 2-3 times to enter a 0.
Date published: 2019-09-26T00:00:00-04:00
Rated 5 out of 5 by from VEry Solid calculatorI've owned and used HP Engineering calculators for 40 years. This is another solid HP calculator with all the features you need.
Date published: 2020-03-02T00:00:00-05:00
Rated 5 out of 5 by from Great Calc!I just recently purchased this product on the Wednesday with free standard shipping, but it came in only two! That was the first best thing with my first time buying with HP. I am a Middle School Student and have found myself using a calculator a lot in class, so I thought I would get a calculator with RPN. I have been borrowing my grandfathers old 41CX, and it has been working like a dream. I just wanted to rescue it from aging, as it is about 30 years old. I have only had this for a matter of hours, which it came just in time because a had a bunch of algebra, which I was able to breeze right through thanks to the 35s. My grandfather has a 15c, which still works perfectly. He is a construction manager, and he uses it all the time for his work. i would recommend this product to anyone looking for a great calculator that will last a lifetime.
Date published: 2009-09-12T00:00:00-04:00
Rated 5 out of 5 by from Waiting for the new 41CVThe 35s is a very practical and robust calculator for the professional. It handles arithmetic, statistics and moderately complex programming tasks very easily.The HP 35s has both RPN and standard algebra entry operation. In either mode, RPN or standard, this unit is highly refined. Users will find it to be very functional and powerful. It handles easy math to the more complex mathematics with ease.It incorporates features and functions that are easy to use and understand, yet has the power to complete some rather complex mathematics.The professional will find it to be very practical. The student will find it to be both rugged and powerful.It does not have graphing capabilities. It does, however, meet the needs and requirements for a robust, economical and practical solution for which calculators are intended.
Date published: 2008-04-13T00:00:00-04:00
Rated 5 out of 5 by from HP Classic CalculatorHP continues to make great calculators like they have for many years. This one works just like my first HP41 CV I bought in 1983. I was sold on HP products then and this New HP reinforces that satisfaction....Thanks and keep making great products.
Date published: 2011-08-29T00:00:00-04:00
Rated 5 out of 5 by from Just got it and love it.I bought this as the same time as the re-issued 15C. I gotta' say, this could become my new favorite. I love the retro look, it feels good, nice size and love the bigger keys. I just might have to get a couple more...
Date published: 2012-04-11T00:00:00-04:00
Rated 5 out of 5 by from Simply..THE BEST!HP 35s is the best replacement to the old best calculator hp 15C! Nothing more to say!
Date published: 2009-07-27T00:00:00-04:00
Rated 5 out of 5 by from HP35s for an Amateur AstronomerI use the HP35s exclusively for programming astronomical formulae. The calculator is handier than a computer at the telescope. The computer is busily engaged in taking photos and/or controlling the telescipe. The HP 35s supplies the data and calculations which are needed instantly from my own programs. The combination of calculator and computer works well for me especially for data in logging the sessions. I particularly like the type of programming which HP calculators use. My only criticism is that the old HP41 should be brought back, it was the greatest calculator around all through my engineering schooling.
Date published: 2010-05-07T00:00:00-04:00
Rated 5 out of 5 by from SolidNice and solid. I use it as a back-up. My primary hand calculator is, believe it or not, the original HP41 from the early 80's. After more than 25 years, it is STILL going strong!!!
Date published: 2009-03-11T00:00:00-04:00
Rated 5 out of 5 by from I recomand HP35 The very large memories are goodThe friendly HP language and numerous adressabile adresses are very usefull ! Yhanks HP
Date published: 2010-09-29T00:00:00-04:00
Rated 5 out of 5 by from One of the Top Three of all timeI enjoyed my HP 41 CV, the HP-28S, and now the HP 35S. My 28S was stolen, so I needed something new. I still use the 41CV, but it is getting old and tired. So far, I love the 35S and it is not as near as complicated or cumbersome as the 50g.
Date published: 2011-09-27T00:00:00-04:00
Rated 5 out of 5 by from FINALLY!!Great to see HP coming back with the "standard" RPN format & keyboard again. I 'm still also using my favorite, the HP-42s. I'm really waiting for HP to re-release the HP-42 again. Does anyone have any word on this possibility?In the meantime, this is a great calculator
Date published: 2008-12-30T00:00:00-05:00
Rated 5 out of 5 by from DisapointedApparently no Frac function for programming. BRING BACK THE 11C!
Date published: 2017-05-28T00:00:00-04:00
Rated 5 out of 5 by from Very Good CalculatorThis is a very good scientific calculator in that it does provide RPN and SOLVE functions that HP is known for. It is also not as complicated to use as something like an HP 48 model. My only wish though is that HP would consider bringing back the HP 42S. The big advantage with that calculator was the ability to name your files and variables with up to 4 characters. Makes it much easier to use them without needing cheat sheets to remember what each variable represents when limited to only a single character for variables and no naming of equations.
Date published: 2010-08-11T00:00:00-04:00
Rated 5 out of 5 by from ExcellantThe HP35s is the best scientific calculator I have ever owned. I have purchased three (3) since my first one back in 1984. The only improvement I would like to see is the function keys layout. The function keys layout is presently vertical, but was horizontal on the old models. I would like the function keys layout to go back to horizontal (like the financial calculators function keys layout is now)
Date published: 2017-06-16T00:00:00-04:00
Rated 5 out of 5 by from Effective Analysis ToolThis calculator is an effective replacement for the HP-33S . It combines programming power with multiple functions and good memory allocation for effective analysis of problems without needing a computer.
Date published: 2019-03-16T00:00:00-04:00
Rated 5 out of 5 by from Good calculatorCould have better battery life, but all around a really solid calculator. Highly recommend for those looking for a new RPN calculator with the solid feel that HP has been known to deliver decade after decade.
Date published: 2019-09-20T00:00:00-04:00
Rated 5 out of 5 by from RPN still Rules!Love my HP RPN based Calculator. Considered old technology but still has a place
Date published: 2019-06-16T00:00:00-04:00
Rated 5 out of 5 by from finally a calculator that matches the 32sIIThe only calculator in 20 years that matches the style and ease of use of the HP 32sII.
Date published: 2012-08-25T00:00:00-04:00
Rated 5 out of 5 by from The Best Scientific Calc in Pocket SizeExcellent calculator for those people who don't want to carry outside the office of home the HP 50g. Excellent clamshell construction to protect the calculator.
Date published: 2008-07-14T00:00:00-04:00
Rated 5 out of 5 by from Great HP35sI was happy to see the HP 35s introduced since I started using HP calculators and programmable calculators years ago. My first was HP 55 then HP 67 etc. I like the HP 35s for it's "simplicity" when I don't need graphing (which is more and more frequent now). The calculator does all I need, in the trusted RPN, and then much more. Simple programs are a charm. Thanks HP.
Date published: 2008-04-15T00:00:00-04:00
Rated 5 out of 5 by from A nice complement to the 50GFor just simple plugging in of the numbers and or a not too complicated equation this is the calculator to use, when you are not allow to use your 50G for a math test.
Date published: 2012-02-12T00:00:00-05:00
Rated 5 out of 5 by from A Classic RPN CalculatorI grew up on RPN HP calculators. It's nice to see that HP sitll makes good RPN cacluators. I would strongly recommend the 35S to anyone that prefers RPN-style calculators.By the way, if you're trying to decide whether to buy a '33S or the 35S and you like RPN...buy the 35S. It's no contest! The RPN capability of the 33S is somewhat compromised. The 33s is a fine calculator but it's a better algebraic calculator.The only thing I wish the 35S had was a way to plug-in modules or download programs via USB. What would be fantastic would be to plug in USB memory sticks for storage of programs and data storage. If HP is listening...this feature is worth $20-30.
Date published: 2010-02-17T00:00:00-05:00
Rated 5 out of 5 by from The Best Right NowYou can read the many other reviews to learn about the shortcomings in the design and implementation of this product. Even with all of them, I'm very happy to have my new HP 35s. It brings back the feeling of HP's "golden years" of RPN calculator products.When HP reintroduces the HP 15c and HP 42s, I will happily throw my 35s into a box in the closet and buy each of those. But until then, this is the best next thing. To put it simply, this is the only decent scientific programmable calculator I could find that is currently manufactured.
Date published: 2011-08-10T00:00:00-04:00
Rated 5 out of 5 by from A good, useful calculator for engineersThe HP35S is very light and the keyboard has a nice feel. It is somewhat cryptic to program but does have the solver functionality. Not quite as nice as the HP42S which is the gold standard for engineering calculators, in my opinion.
Date published: 2013-03-03T00:00:00-05:00
Rated 5 out of 5 by from Good BuyI like this calculator. It replaces a 33s and is very similar in usage. I wish that the 35s automatically seperated input numbers with commas to indicate 1000s as the 33s did. Otherwise, I am completely satisfied with the operation of this calculator.
Date published: 2011-10-29T00:00:00-04:00
Rated 5 out of 5 by from ReviewWorks very good. Takes some time to get use to moving from rpn. Challenge is that calculator is not available in any stores in the community that I live. HP should consider bringing back older versions like HP25 and HP41. These are very good products for scientific community
Date published: 2011-10-22T00:00:00-04:00
Rated 5 out of 5 by from Worthy successor to my original HP35 !I got an HP35 for Christmas, 1973 (or was it 72?) and sadly, it won't power up anymore. I was delighted to find this one, and its functionality is awesome. I'm able to make good use of it for financials as well as my engineering calculations for circuits and antennas. VERY happy that HP still makes great RPN calculators.
Date published: 2017-05-05T00:00:00-04:00
Rated 5 out of 5 by from A very nice calculator. Love the RPN !I have owned HP calculators for over 30 years. I still have a 15c and also a 42s and a Prime graphing calculator. HP makes the best calculators, period. I just love RPN, it SO superior to using algebraic calculation. The 35s does it all. The keys are just right. It has a lot of functions, but most are visible in blue or yellow or white, and not hard to find.
Date published: 2020-02-02T00:00:00-05:00

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