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 Good work horse RPN I am a devoted HP RPN user and after the outright failure of the HP 33 it was great to have a classic HP back. The Enter button is back where it should be and the layout is right for my surveying functions. The one drawback is the bad placement of the polar/rectangular function. All in all - great calculator! October 11, 2011
Rated 5 out of 5 by One of the Top Three of all time I 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. September 27, 2011
Rated 3 out of 5 by Close but not quite I've had a number of HP calculators over the years, but my favorite, my HP 32S, finally quit working and I had to replace it. I bought a 33S but its odd key layout and illegible labelling left me wishing for better. The HP 35S is overall a good replacement, but it has a number of issues that keep it from being the tour-de-force of usability that I had come to expect of HP calculators. 1) The "display all" format is just broken. On other calculators where this function is available - even on the 33S - it intelligently adjusts the precision of the display so that as many significant figures as possible are displayed, along with the exponent. On the 35S they changed this so that it always displays all significant digits - pushing the exponent off the edge. You have to scroll the screen usng the arrow button to see the exponent. What's worse, in algebraic mode, the left and right arrow keys don't scroll the display - they edit the last line entered. There appears to be no way to view the exponent of a 12-digit number in ALG mode using display all format! Granted that ALG mode is a waste of ROM space anyway, but still... Fail. 2) Some poor choices have been made in button assignments - most egregiously, the STO function has been relegated to a shifted position, while the MODE function has been made a primary funciton. MODE is a setup function and little used during calculations, while STO is something you want to have as convenient as possible. (Again something that the 33S gets right...) Also, the logarithmic keys have been assigned in a non-intuitive way - on older models (such as the 34C) one shift key was used for "forward" functions and the other for "inverse" functions, for both logarithmic and sinusoidal functions, and the common log/antilog and Naperian log/antilog were grouped together. This makes more sense when using the calculator - "blue for inverse" - than the chosen grouping. And why can't y^x and xroot be on the same key? 3) The complex number functionality is nice, and integrated in a better way than on previous models. However, the "theta" symbol that is used in polar display is so close to an 8 that they are almost impossible not to confuse. It would have been smarter to display an "angle" symbol that would differ in height and shape from any digit. Also, the useful "show" function, which shows you the full precision of the mantissa, simply doesn't work for complex numbers. Why not? It wouldn't have been hard to make "show" display the real mantissa and complex mantissa on alternate presses, for example. And, in ALG mode, where the display can't be scrolled, complex number display is hopeless piled on useless. 4) The octal, hex, and binary calculation modes, while useful in principle, are made inconvenient in practice by an entirely needless restriction. One must enter a character to indicate the base for non-decimal numbers, even when the calculator's "base" mode has been changed, and entering the base indicator takes an irritating flurry of button pressing. This would have been so simple to get right, and they got it wrong. There is a lot to like about this calculator. The appearance is elegant (though not to the standard of the 32S and 32SII) and the labeling is vastly more legible than the 33S. They keys have a pretty good feel. Labeling one shifted function above the key and the other on a beveled key face is a return to one of the best ideas of the past. (The "left" and "right" arrows on the shift keys are illogical, but please! keep the beveled keys, and I promise to live happily with the arrow labels.) Putting the "enter" key back where it belongs is also appreciated, and I'm grateful that RPN calculators are still available at all. I just wish that the additional functionality had been implemented in a more thought-out manner. I've concentrated on the negative in this review because of the frustration I've felt in buying the 33S, and finding it difficult to use because of the labeling and keyboard issues, then the 35S, which solves the legibility problems but picks up these usability issues. The 32S and 32SII were something of a pinnacle of RPN calculator design and usability, with perhaps the sole crticism than on the 32SII it would have been better for legibility to use beveled-edge buttons for the second-shifted functions. If HP had actually built on those models, introducing new features like the 2-line display and complex number handling, resurrecting good ideas from the past like the beveled keys, but not breaking stuff that worked, I would be zealously enthusiastic.As it is... please, guys, try to do better next time. September 19, 2011
Rated 4 out of 5 by Good calc but why changed? Good: Shape and spacing of keys, ridges on the sides of body, display, position of ENTER, position and shape of CURSORS, Confusing: Depiction of HMS symbol with right arrow-previous HR or H symbols were just fine. RIGHT SHIFT before C also turns the calculator off. STO was more convenient as direct/white key. I have been using HP calculators for 25 years and would like to know what was wrong with older configuration of symbols that HP changed for this 35s? September 16, 2011
Rated 5 out of 5 by Thank you HP My HP 41C finally died after 30 years, I spilled a Coke in it. The HP 35s is fantastic for the diehard RPN fanatics. The fact that the keyboard is set up in the same style with the enter key above the numbers made the transition seamless. I was not able to adjust to the 33s keyboard. Thanks again for the 35s! September 1, 2011
Rated 5 out of 5 by HP Classic Calculator HP 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. August 28, 2011

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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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