HP 35s Scientific Calculator


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UPC: 883585142859   Part: F2215AA#ABA


  • Get professional performance from HP’s ultimate RPN scientific programmable calculator—ideal for engineers, surveyors, college students, scientists and medical professionals. Scientific projects require accuracy, functionality and dependability for success. The HP 35s scientific programmable calculator delivers them—and more—with features that include 30KB user memory, your choice of RPN and algebraic entry-system logic, a convenient two-line display, and the time-saving HP Solve application.



  • RPN or algebraic entry-system logic, keystroke programming, HP Solve and 100 built-in functions, Large 2-line display with adjustable contrast, Single and two-variable statistics, linear regression and more, 30 KB of memory plus 800+ independent storage registers, Fraction mode plus fraction-to-decimal conversion, 42 built-in physical constants, plus a complete library of unit conversions, inverse functions, cube root, logarithms, exponents, factorials and more

Ideal for

  • Ideal for engineers, surveyors, college students, scientists and medical professionals.

Permitted for use on

  • Permitted for use on SAT Reasoning Test, SAT Subject Tests in Mathematics Level 1 and Level 2, ACT Mathematics Test, PSAT/NMSQT, AP Chemistry/Physics, PLAN, and EXPLORE.

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Internal specs

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Best used for

  • Engineering; Surveying; Science; Medicine

Permission usage

  • SAT Reasoning Test; SAT Subject Tests in Mathematics Level 1 and Level 2; ACT; PSAT/NMSQT; AP Chemistry/Physics; PLAN; EXPLORE

Built-in functions

  • Over 100

Memory registers

  • 800

Memory, standard

  • 30 KB


  • 2 x CR2032 batteries; battery life: 0.73 year @ 1 hr/day (approximately 9 months)

Power off memory protection

  • Yes

Auto power off

  • 10 minutes

External specs

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  • Adjustable contrast with 2 lines x 14 characters + indicators, 14 character dot matrix (5 x 7)

Display type

  • LCD

Dimensions (W x D x H)

  • 8.2 x 1.82 x 15.8 cm

  • 3.23 x 0.72 x 6.22 in


  • 125 g

  • 1 year warranty (may vary by region)

What's in the box

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  • Calculator, batteries, user manual, premium protective case

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Customer ratings and reviews for HP 35s Scientific Calculator

Rated 5 out of 5 by HP35s a highly recommended product I have used hp financial & scientific calculators since 1985, and after my hp15c was damaged by me in 1990, I waited until the year 2009 to purchase an hp35s. The 35s is an engineering and science degree in a handheld unit and places anyone directly into a product development mode since the functions automates higher level math and science processes, and in addition I think the 35s should be a standard equipment for all high school students. July 29, 2009
Rated 4 out of 5 by Worthy of it's namesake 28-July-2009 Having purchased a new HP-35s several months ago, I can now express my opinions on it. First of all, I am a long-time user of HP calculators, starting with the original HP-35, which purchased in my college days for the unheard-of price of $395!! When the HP-35 died (batteries went defunct) about 10 years. later I purchased an HP-25S (I think), but it somehow disappeared a few years later. Maybe the shock of the loss has dimmed my memory!! My RPN calculator prior to the HP-35s was an HP-32s, which I still own, and which is perfectly functional. I puchased the HP-35s primarily for nostalgic reasons, as the 35th anniversary of the orignal HP-35 was too much to pass up. In other words, I really didn't NEED a new HP calculator. I noted several pleasant surprises with the HP-35s. First was the great visibility of the display. It probably isn't really bigger than that of the HP-32s, but it somehow LOOKS bigger. And having two line of display is a major plus. The classic HP-35 case angle is also a big plus The second feature was the solid keyboard feel, which wasn't really a surprise, as none of the competitors' keyboards have ever been comparable to HP. I know that some of the 2nd-generation HP's, along with some of the most modern low-cost HP's have had marginal keyboard reviews, but I suspect that HP wisely chose to make sure that the HP-35 name was not maligned by a successor with a cheap keyboard. Just as an aside, I observed the introduction of the HP-33 some years ago, and was completely turned off by it's "retro" look and by the fact that it was, by default, an algebraic mode calculator. It is my contention that a calculator that is RPN as a secondary mode will not have its key placement optimized for RPN use. I thus had considered the HP-33 not worth the bother in algebraic mode, as I am firmly in the RPN camp. Conversely, I also consider the algebraic mode of the HP-35s to be of litle use. The programmability of the HP-35s tops all other HP's I have owned, though admittedly I have not owned the whole stable of HP's line of programmables. I have already written some useful library functions, the game of Yatze, and a program to check the statistical distribution of the RANDOM function in the calculator. Some of these programs were undertaked as learning exercises for exploring the HP-35s programming capabilities. The inability to STORE HP-35s programs off-line is annoying. But so is the price tag that goes with that capability. My perspective is that a calculator is a calculator, and a computer is a computer. If I need a computer, I'll use a computer! Writing relatively short programs for solving repetitive computations is easier on the HP-35s that writing comparable programs on a destop computer. As such, the HP-35s fills a useful niche. I think the choice of batteries (2 x CR2032) was a fine choice. Two of these batteries provides 6 volts; it takes four alkaline batteries to generate the save voltage. In my opinion, anyone who runs the pair of CR2032's into the ground in less than 6 months, as one reviewer had, should be using a real computer for such intensive computations. I would also like to comment on a number of complaints raised in HP-35s reviews regarding the lack of polar-to-rectangular and rectangular-to-polar conversions on the HP-35s. I have surmised that these conversions, which were included in the HP-33, as well as in my HP-32s, were not dropped on the HP-35s without reason. And I suspect that the reason was two-fold: a) you may have run out of internal ROM in the 8502 processor; b) the ability to directly manipulated complex and polar coordinate data types rendered the polar <-> rectangular conversions redundant. In implimenting a rich set of complex and polar coordinate data functions, it became possible to remove the explicit conversions. It seems like a reasonable trade-off to me. I have obtained the polar <-> rectangular conversion program through the HP web-site after writing one for myself from scratch. I haven't even figured out how the HP program actually works yet, but I suspect that when I more fully understand the HP-35s EQN capability, it will become clearer. The HP-35s possesses features far beyond the original "HP-35", for a fraction of he price, and is solidly built. I would have to think long and hard about what I would do differently in a follow-on "HP-35s/II". Perhaps a cell-phone style SIMM card for storing programs? In summary, the HP-35s is deemed worthy of its namesake. July 28, 2009
Rated 5 out of 5 by Simply..THE BEST! HP 35s is the best replacement to the old best calculator hp 15C! Nothing more to say! July 26, 2009
Rated 5 out of 5 by Top Notch product I have had an HP35, 41, 32sII and now the 35s. They all are great calculators and I was really happy to see that HP maintained its reputation for solid quality with the 35s. I still have my 32s and this 35s has the same solid feel as the 32. The function keys have been relocated but so far this has not bothered me. It has the right mix of functions for my use. I do most of my heavy calculating work with mathcad but I always have the hp on the desk for those quick number cruches that one has to deal with. Although the 35s is slightly larger than the 32sII,it still fits in my shirt pocket and I like that! The one thing I don't like is that on the 35s the "STO, LN, and e^x" keys are now shifted keys. These I use often and I wish HP had left them as they were in the 32sII. July 10, 2009
Rated 5 out of 5 by finally Finally HP has made a new calculator in the style of old. Aside from silly layout issues (like the traditional placement of the x^2 function as a shifted key, which HP got right on the HP45 but rarely since), this is an excellent calculator with good key feel, adequate functions, a big ENTER button, etc. Even the color scheme looks pleasing and comforting. The two-line display is a good plus as well. The HP35s is somewhat bulky, but maybe HP will resurrect the HP15 form next... May 22, 2009
Rated 2 out of 5 by not a good survey tool I 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. May 19, 2009

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Owner support

Warranty information

This product is covered by the standard HP warranty

Support information

Support for this product is provided by HP Customer Care

Returns & exchange information

The HP Home & Home Office Store will accept returns or exchanges for this product up to 21 days after delivery

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