The HP 35s is Hewlett-Packard's top-of-the-line pocket scientific calculator, celebrating the 35th anniversary of the HP 35, the first pocket scientific calculator, which was introduced in 1972. It is the successor to the 33s and the famous 32SII, among others.

Over the 33s, the 35s adds enhanced complex number support, better programmability, EOS instead of AOS-style input in algebraic mode, and support for vectors, among other improvements. Essentially, it appears to take a 33s, give it a more traditional appearance, and add some of the most important features from the 15C and 42S.

The 35s is also the most powerful calculator approved for use on the NCEES exams.


Included Accessories

  • Protective case
  • Batteries
  • Short printed quick start guide

Physical Characteristics

  • 158 mm by 82 mm by 18.2 mm (6.2" by 3.2" by 0.72")
  • 142 g (5.0 oz) with batteries
  • Black metal faceplate with textured black back
  • Hard plastic keys with traditional HP-style hinged action for fast and accurate typing

Technical Specifications

  • Dot matrix LCD (5 by 7 pixel characters) with 2 lines of 14 characters
  • 8502 processor
  • 32 KB RAM (30 KB available to the user)
  • Two CR2032 batteries, providing 250 hours of typical use
  • Over 100 built-in functions
  • 12 digits displayed with 3-digit exponent
  • HP part number F2215A (Data Sheet)

Calculating Environments

  • Traditional RPN (Reverse Polish Notation) with four-level stack
  • EOS-style algebraic, supporting 13 pending operations
  • Backspace and undo, plus cursor keys for editing



  • Keystroke programming, comparable to the 33s and 32SII
  • Over 800 registers
  • Flags, tests, branching, and looping
  • Alphabetic input

Probability and Statistics

  • Σx, Σx2, Σy, Σy2, Σxy, n
  • One and two variable statistics
  • Linear regression
  • Normal and inverse-normal distributions
  • Grouped standard deviations
  • Curve fitting (linear, logarithmic, exponential, and power, when using program listing from user's guide)
  • Combinations, permutations, factorials, random number generation


  • Decimal hours/degrees to hours/degrees-minutes-seconds conversions
  • Rectangular and polar modes
  • Simple unit conversions (temperature, weight, distance, length, and liquid volume)
  • Base conversions including arithmetic and Boolean logic on 36-bit numbers (decimal, binary, hexadecimal, octal)
  • 41 built-in physical constants plus pi


  • Trigonometry, including hyperbolic and inverse sine, cosine and tangent, with degrees, radians, or grads
  • Numeric integration
  • 2D and 3D vectors, including absolute value, dot product, and angle between vectors
  • Solving, including the traditional HP Solve
  • Evaluation of equations
  • Decimal functions, finding the integer and fractional parts, the floor, and rounding to a specified number of decimal places
  • Fractions, including conversions between decimals and fractions
  • Time value of money
  • Complex numbers, with multiple options for display format (only one stack level used per complex number)

Standardized Exam Support

  • AP Chemistry
  • AP Physics
  • SAT Reasoning Test
  • SAT Subject Tests in Mathematics Level 1 and Level 2
  • ACT Mathematics Test
  • PLAN
  • NCEES FE and PE Exams (approved for 2008 exams)
  • Highly recommended for Texas UIL calculator competitions

HP Provided Documentation

  • User's Guide, 382 pages, provided in printed form with some calculators and included in electronic form on CD with others
  • Short quick-start guide, provided in printed form with other calculators
  • Fifty-five Training Modules, totaling 263 pages, provided as a separate download

Warranty and Support

  • 1 year limited warranty in the US, provided by HP America
  • Toll-free technical support in the US, at 800-HP-INVENT (800-474-6836)


You might like also

HP calculator museum: HP48s/sx Graphing Calculator, 1990
The HP-48 is a series of graphing calculators using Reverse Polish notation (RPN) and the RPL programming language, produced by Hewlett-Packard (HP) from 1990 until 2003. The series include the HP-48S, HP-48SX, HP-48G, HP-48GX, and HP-48G+, the G models being expanded and improved versions of the S models. The models with an X suffix are expandable via special RAM (memory expansion) and ROM (software application) cards. In particular, the GX models have more onboard memory than the G models. The …
2406 Days ago
HP calculator museum: HP39+ student graphic calculator, 2003
HP-39g series calculators are the successors of HP-38G. There are five calculators in the 39 series of HP graphing calculators. These calculators have algebraic entry modes, and can perform numeric analysis together with varying degrees of symbolic calculation. All calculators in this series are aimed at high school level students and are characterised by their ability to download (via cable or infra-red) APLETs or E-lessons. These are programs of varying complexity which are generally intended to be used in the …
2448 Days ago
HP calculator museum: Hewlett Packard HP 40G Graphing Calculator
The HP-40G is an algebraic entry only graphing calculator from HP. Based on the HP-38G design, numerous firmware improvements and the inclusion of a CAS made this a very capable math platform. The HP39g and the HP 40g were both released during the year 2000. They are made on the same hardware platform with 1MB of ROM, 256KB of RAM and have 51 keys. The physical difference between the HP39g and the HP 40g is the IR port - 40g …
3040 Days ago
HP calculator museum: HP 49g Graphing Calculator
I recently added a HP 49g to my collection of HP calculators (Price paid: 3 euro). This model is not very loved by owner and is sometimes described as the worst model of HP calculator for the following reasons: The keys are soft and VERY imprecise: you need to press hard to enter data. Display harder to read than contemporary hi-end graphing Bad documentation compare to the HP46 series The default mode of the calculator is not RPN. To use …
3122 Days ago
HP calculator museum: HP 10BII Business Calculator
With the HP 10bII you now have the power to keep up with all your growing course-load, small business or other financial calculations. You'll be able to work quicker and more efficiently with over 100 time saving, easily accessible business functions. Because it works in algebraic notation, it's easy to learn and use. From HP 10BII page …
3140 Days ago
HP calculator museum: HP 38G student graphic calculator, 1995
The HP 38G is a graphing calculator for high-school math and science teachers and students. Introduced in 1995 at $79.95, it supports aplets, small applications that can be developed as part of the curriculum and can be easily distributed from the teacher's calculator to the students'. Using aplets, all the students in the classroom can have their calculators programmed identically at the beginning of a lesson. Equations are entered using algebraic format rather than the Reverse Polish Notation (RPN) used …
3140 Days ago
HP calculator museum: HP 50g Graphing Calculator
The ultimate graphing calculator for surveying, engineering, math and science professionals and students is even better. The new HP 50g graphing calculator features an SD card slot with formatting functions, RPN~, Algebraic and Textbook data entry, the largest high-contrast screen with more usable space than ever, serial port and USB and connectivity. Plus, HP Solve, structured programming and Computer Algebra System (CAS). This calculator is also having the MetaKernel build in and the picture I did pixel by pixel on …
3140 Days ago