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 My favorite calculator Over the years, I have owned over half a dozen HP calculators and this one (HP35s) is by far my favorite. Pros: HP and the other reviewers have already listed many of the pros, so I'll just add these: The look and feel of the calculator are high quality. The two line display is helpful but the largest pro is the RPN logic. Cons: No real cons, but it would be nice if HP adds a micro USB port to the calculator to interface with my computer. (HP, are you listening?) September 7, 2010
Rated 4 out of 5 by Excellent, but room for improvement. I have upgraded from an HP 11c Scientific Calculator to the HP 35s Scientific Calculator. Here is my impression of the 35s after nine months. PROs: Visually, I think the 35s is a good looking product. The keys are thoughtfully organized and well labeled. The quality of the key labels is excellent and should last a lifetime. The tactile feel of the keys is excellent. The mathematical feature set is very rich and very impressive. The key-stroke sequence needed to make a calculation is well-done and good as can be expected. CONs: The display is the primary problem with this calculator. The display is low resolution—too low for today’s standards. The display is highly-reflective and interferes with viewing its numerical images. The numerical images on the screen have a shadow, so when your eyes are not perpendicular to the surface of the display, this shadow will grow as the angle increases; this makes the numerals and symbols appear fuzzy. The bezel for the display will partially block your view of the bottom line in the display, so you need reposition the calculator to see it. The display is parallel with the top surface of the calculator, so this design increases the light reflection and bezel blocking problems. Some keys were not as responsive as others; however a call to HP tech support quickly resolved the matter. The key problem was due to some static electrical buildup in the keys, and was easily discharged by replacing the batteries with coins for fifteen seconds. This was not a chronic problem, but I was advised that electric fields (not from the calculator) may have created the buildup. My wish list for this calculator: Improve the display. Offer a printed version of the manual for purchase. Offer a soft slipcover as an alternative to the large hard storage case. Reduce the longest physical dimension of the calculator by 10%. Tilt the display towards the user. August 11, 2010
Rated 4 out of 5 by Very Good Calculator This 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. August 11, 2010
Rated 3 out of 5 by Not so logical for land surveyors I bought the 35s because it was one of the only two HP calculators allowed on the NCEES Exams. Pros: It is a very attractive calculator, and has a longer lasting construction than the 33s. Also has better button feel than the 33s. Cons: Upon using the built-in functions I found out that the conversion from HR (decimal degrees) to HMS ( hours minutes seconds) that was so common in all other HP calculators was slightly changed. Now it shows "to HMS" and "from HMS", this is just a small change but requires additional thought every time I use it. Also the "store" and "recall" buttons that were seperated on so many other HP calculators have been combined. This now requires the use of the shift key, which is another keystroke that is annoying. Finally the polar/rectangular conversion is more time consuming than it is worth. Conclusion: While the 35s is very attractive, the button configuration is not practical for land surveyors that are well acquainted with other HP calculators. My recommendation is that the 33s be upgraded to the same quality construction as the 35s and then you would have a much better calculator for land surveyors. August 5, 2010
Rated 5 out of 5 by HP35s for an Amateur Astronomer I 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. May 7, 2010
Rated 1 out of 5 by Not what I expected from HP I am sorry to say that I'm very disappointed with the HP35S calculator. I own and have used the HP25C, 33E, 34C, 32SII and have been very satisfied with all of them. However, due to some limitations in the older models (memory) I was forced to upgrade my 32SII recently to a 35S. Two gripes are serious enough for me to return this HP, these being: the keyboard, compared to the 32SII and previous models the keys are mushy and do not always register the stroke. The next major issue is the display. The screen is highly reflective which decreases contrast making it very sensitive to position (especially with fluorescent lighting), you have to position the calculator perfectly in order to see the numbers. Moving it around on the desk makes the numbers almost invisible so you're continuously adjusting it to make it visible. Other (minor) issues: the 2 line display; I'm not really sure what the intent of that was but having used it for only a couple of days now, it is more confusing than helpful, it is not always clear (at a glance) what the result is. Also I have not been able to find a way of displaying a text line and a result at the same time (for programs). April 15, 2010

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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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