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The HP 35s Pocket Size Scientific Calculator

Get professional performance from the ultimate RPN (Reverse Polish Notation) scientific programmable calculator.

Scientific Calculator

Switch between RPN and algebraic entry-system logic at any time.

The HP (Hewlett Packard) 35s features a large two-line display, and the powerful HP Solve** application.

Professionals and college students have the flexibility no other scientific calculator can offer with the choice of RPN or algebraic entry-system logic.

  • Choose between RPN or algebraic entry-system logic — no other scientific calculator offers both
  • Completely programmable — work more efficiently with keystroke programming
  • Handle the heaviest workloads with ease using 30 KB of memory plus 800+ independent storage registers
  • Store an scientific equation then use again to solve any variable using HP Solve or use 100 built-in functions


Reliable performance and accurate results

The HP 35s delivers with a large 2-line alpha numeric display with adjustable contrast, raised edges to protect the keys, and a robust library of built-in scientific functions and constants.

  • Large 2-line display with adjustable contrast to easily view entries, results, menus and prompts
  • Simplify physics with 42 built-in physical constants, plus a complete library of unit conversions
  • Get accurate results with edit, undo, delete capability
  • Enjoy a compact pocket size and protective raised edges that are designed for the mobile professional


Power and functionality in one

Save time with an impressive array of programmable scientific functions.

  • Use strong statistics functions for single and two-variable statistics, linear regression and more
  • Use base-n functions for binary, octal, decimal and hexadecimal number calculation and conversion
  • Perform operations on complex numbers, calculate logarithms, exponentials, inverse functions and more
  • Take advantage of a powerful fraction mode plus fraction-to-decimal conversion


HP quality and support

Have confidence that every time you turn on your HP calculator, every calculation you make, results in dependable, worry-free performance and accurate results.

  • Rely on HP quality and award-wining support — online and by phone.
  • Get the most from your calculator, visit for downloads, tutorials and more.


Get a quote on this scientific calculator from Allen Associates

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