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 HP 35s The shape of this calculator remind me of my first HP calculator, the HP 41 CX, which I used through engineering school. Unlike the HP 41 CX, which I still have, the HP 35s feels much lighter, is slim and it feels right in your hands and the price is reasonable. February 16, 2012
Rated 4 out of 5 by Powerful, Portable, Programmable, so good I have 2 The 35S is an extremely powerful yet portable calculator. Although both algebraic and RPN modes are supported, this calculator works better with RPN and has converted me to RPN after many years using an algebraic HP27S - RPN is faster, more flexible and once you are used to it, simpler. Why does the 35S work better with RPN? Because with algebraic ,you must enter the function before entering the value eg the sine key must be pressed before entering the number. The lack of rectangular to polar coordinate conversion keys is not serious - it can be addressed with programs available from vendors and the web. And the programs introduce new users to programming. Programming the 35S is fascinating. By comparison with programming on a PC, the programming is restrictive, but there are data types and methods available to accomplish a great deal with a tiny amount of code. I am not a professional programmer but find programming the 35s very enjoyable and I have bought an old HP 41X so I can convert some of the vast number of programs available for the 41X to run on the 35S. Wishlist? More sophisticated handling of alpha characters and a USB connection. I would pay more for a calculator with these facilities. I also have a 50G which has these features but it isn't really a portable calculator. I bought the 50G secondhand, whereas I have bought two 35S new. The 35S isn't very fast - althought in typical calculator usage, processor speed is not a issue - it is only with some programs that you notice that is it slow - it is slower than its predecessor, the 33S, probably because of the sophisticated vector data handling. Local note: The price of calculators and many other goods in Australia is double the dollar value because of import duties, taxes and distribution costs. I would prefer to buy directly from HP, althugh I have no complaint about the Australian distributor - it is simply a matter of cost. January 31, 2010
Rated 5 out of 5 by An engineers calculator. Period. The best calculator permitted on the California engineering and surveying exams. Fast calculations with RPN and programming capabilities. Very sturdy and compact design that fits in the shirt pocket or jeans back pocket. The buttons are solid and responsive. Comes with a protective zippered case. I gave it 5 stars all around because you get what you pay for. December 12, 2009
Rated 4 out of 5 by Good, but could be better My experience with HP calculators includes using an original HP-35 some forty years ago when the model was new. It was an amazing encounter as up until that time one had to employ slide rules and books filled with tables of function values. Learning RPN was easy. My only discomfort was the disappointment that I didn't think of it first. My first HP calculator I bought for myself was an HP-25. Following that were an HP-67, an HP-41C, an HP-15C, an HP-16C, an HP-28C, and maybe one or two I can't remember. Now I have a new HP-35s. In brief: I like it and I'll be buying another as a spare. For criticisms of the HP-35s, I agree with some of the other reviews in that the handling of complex values is not what it should be. Why can't I take the square root of a negative value to produce a complex value? Why do so many operations not work on complex values? Many older models had the simple and quite useful rectangular/polar conversion operators which are sorely missed in the HP-35s. Also, native HMS value addition and subtraction have been left out. Vector arithmetic is incomplete. There is a dot product, but where is the cross product? The metric/Imperial units conversion functions should have been implemented as a menu instead of eating valuable keyboard space. Operand indirection, quite similar to that of the HP-67, is incomplete when compared to the HP-41C. The 30 KB of RAM is nice. It would be much nicer if there were a way to transfer contents via USB connectivity. That big old ENTER key is exactly the right size and has the right placement. But only time will tell if it and the other keys hold up to the standard set by the classic double injected hinged keys of the Old Days. I have no criticism of the algebraic entry system as I don't use it. March 18, 2014
Rated 1 out of 5 by Worst HP keyboard ever used I've used HP's since the 80's, loved the 34C and my 11C. Unfortunately lost the 34C and used the 11C for over 20 years until last week when the display couldn't take commercial travel in unpressurized baggage compartments. Now I'm stuck with this 35S piece of garbage that I bought over a year ago and through in a drawer. I'd come to expect unequaled quality and performance of HP calculators and they don't offer anything close to the old 11C or the 34C keyboard feel. Perhaps they should beg Carly Fiorina to come back to run the company. March 12, 2014
Rated 2 out of 5 by Keys give out! The keys on this calculator are horrible and start to malfunction within 4 months of owning it. They require too much pressure and do not hold up to constant use. I cannot rely of the results that I get. I have to double check (sometimes triple check ) my results. The keys are too hard and only respond if pressed very hard. I do like the layout and the appearance of it - I only wish that it worked better. October 17, 2013
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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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