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 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 December 30, 2008
Rated 4 out of 5 by PROGRAMMING PROPERTIES There 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. December 23, 2008
Rated 5 out of 5 by A return to the traditional keyboard layout! Well, mostly. But this is a great calculator! Thank you, HP for putting the large 'Enter' key where it should be (where it has been for years). Now please revamp one of the 48/49 models to put the enter key where it belongs so I can replace my aging 48gx! Good job, HP. November 7, 2008
Rated 5 out of 5 by Finally An hp calculator in the true sense. Form and Function in the way that made hp famous. Good Job. October 18, 2008
Rated 5 out of 5 by Ahh, relief - a new RPN calculator that is good Except for the obvious complaint that others have raised about STO key being shifted, I love this calculator! The keyboard is not as good as decades past, but it is very good - especially compared with recent HP calculators. Don't follow the examples in the programming section regarding labels - you can go to any label you want with the 3 digit numbers. I've organized several routines under one letter label and XEQ or GTO them from anyplace else. I've been adding in a whole library of special functions this way. I just keep a card with the labels written down in the little webbing of the case. I even have a register convention and stack added using the indirect memory for chaining together function calls and saving registers. Complex operations are ok - not as good as the HP graphing calculators (for instance, square root of -1 is an error, not i), but it's still easier to use than my 32sii thanks to the improved display. I don't think the manual has it right about complex numbers on the stack though - it seems to me that I get all four levels, not the two that the manual claims. Also, the hexalator mode is not sooo bad. To get the little 'h' on the end of a number to denote it as hex, it's shift-base-6 which is easy enough to remember. I wouldn't swap it for my 16c, but it's workable, and I think I like it better than the hex mode on my 32sii, since it's easier to mix hex and decimal in calculations. 36 bit word though? Where did that come from? Hopefully HP will come out with a 35sii that puts the STO key on a top key - so long as they don't muck with much else (especially the keyboard!!!). October 16, 2008
Rated 3 out of 5 by Flawed keypad The cannot enter a data stream with any confidence. The keys do not have a good feel and I am constantly making mistakes, and having to re-enter the data stream. I would love this calculator except fo rthe key pad. I gave it poor marks because of the keypad problem. Put a different keypad on theis calculator and it's perfect. I would buy the 33s, except that the reviews indicate that it has the same problem. Not up to HP standards. Go back to 32S keypad and it's perfect. September 29, 2008

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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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