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HP 35s Scientific Calculator

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1,110 ratings

| 38 answered questions

$189.99

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Brand	HP
Color	Black
Calculator Type	Engineering/Scientific
Power Source	Battery
Screen Size	1

About this item

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Delivers professional performance and flexibility
Completely programmable plus more than 100 built-in functions
30KB of memory with 800 memory registers
Store an equation and then use again
Includes a premium carrying case

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Product information

Product Dimensions

6.2 x 3.2 x 0.7 inches

Item Weight

4.8 ounces

ASIN

B004A0XHH4

Item model number

35s

Batteries

1 Lithium Metal batteries required.

Customer Reviews

1,110 ratings

4.7 out of 5 stars

Best Sellers Rank

#35,902 in Office Products (See Top 100 in Office Products)
#45 in Scientific Calculators
#141 in Math Materials

Is Discontinued By Manufacturer

Date First Available

August 26, 2010

Manufacturer

Hewlett Packard

Country of Origin

China

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Product Description

Scientific calculator delivers professional performance and flexibility, allowing you to switch between RPN and algebraic entry-system logic at any time. Ultimate pocket-size performer is completely programmable so you can work more efficiently with keystroke programming. Handle the heaviest workloads using 30KB of memory plus more than 800 independent storage registers. Store an equation and then use again to solve any variable using HP Solve application or use 100 built-in functions. Simplify physics with 42 built-in physical constants and a complete library of unit conversions. The HP 35S also features enhanced fractions mode, statistics and mathematics packages with base-n function. Large 2-line display offers adjustable contrast to easily view entries, results, menus and prompts. Get accurate results with edit/undo/delete capability. Enjoy a compact size and protective raised edges that are designed for the mobile profession. Calculator includes a premium carrying case.

Customer reviews

4.7 out of 5

1,110 global ratings

5 star		82%
4 star		10%
3 star		2%
2 star		2%
1 star		4%

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Top reviews from the United States

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Jackson

Excellent. All I use.

Reviewed in the United States 🇺🇸 on January 1, 2023

Item Package Quantity: 1Verified Purchase

Excellent calculator. All that I will use. I had an original of this model when it first came out and used it daily. I am a Civil Engineer. I liked it so much that I replaced it with a new one. Only issue is how much more expensive they are now. But, still worth the money!
Recommended!

One person found this helpful

Helpful

WAYNE M SYVINSKI

Two parts success, one part failure

Reviewed in the United States 🇺🇸 on April 23, 2021

Item Package Quantity: 1Verified Purchase

Note: I would actually rate this 3.5 stars if I could. The "lost stars" are mostly due to the fact the the user needs to program functionality that should be available out of the box.

I was studying accounting and decided to take the plunge into RPN. I bought an HP-12C Platinum financial calculator and was hooked on RPN. So, when I decided I wanted to study mechanics and circuits, I looked around for an RPN scientific calculator. The only non-graphing RPN scientific calculator out there is the HP-35s (unless you want to pay the $$$ for SwissMicros).

HP could have hit a grand slam with this calculator, but they got LAZY. However, there are workarounds available for certain shortcomings, and missing functionality can be supplied by the user via keystroke programming. If you want or need a scientific RPN calculator (as opposed to a graphing one - if you are a college student, many classes won't allow graphing calculators), I would strongly recommend getting the HP-35s (If it did not provide user-programmability, I would NOT recommend this calculator), but be prepared to put some effort into filling the gaps. If you want an RPN graphing calculator, get the HP Prime (which also does a MUCH better job of providing native functionality).

PROS:
* RPN - once you go RPN, you never go back.
* Great keyboard - not the quality of the old HP Voyager calculators, but very good.
* Handles complex numbers using a single stack entry; previous HP calculators required you to enter the real part then the imaginary part, then press COMPLEX to combine the two, requiring you to use 2 of the 4 stack entries.
* Complex numbers can be used with ln(x), x^y, sin(x), cos(x), tan(x), abs(x)
* Handles vectors natively; calculators like the TI-36X Pro and the Casio fx-115 and fx-991 calculators require you to use a special program and enter the vector components separately, which I find cumbersome beyond belief
* Complex numbers can be entered using cartesian or polar notation.
* One of two RPN calculators allowed for the FE and PE exams. The other is the HP-33s, which, while functional, is ninth-circle-of-hell ugly.

CONS:
* (inexcusable) does not automatically recognize when complex numbers are required. If you try to find the square root of -5, you will get the SQRT(NEG) error. Instead, you have to enter it as 5i0. If you have a real number on the stack, you have to add i0 to cast it into a complex number.
* (inexcusable) Does not compute vector cross products, but you can write a program to do this
* (inexcusable) Functions x^2, log(x), 10^x, sqrt(x) cannot be used on complex numbers; there are workarounds for this using ln(x) and x^y
* (inexcusable) Cannot compute arcsin, arccos, arctan for complex numbers, but you can write programs to do this.
* Does not have a function to calculate complex conjugate; there is a workaround for this
* Cannot convert a single complex number between cartesian and polar format; you set the display mode for the calculator itself, and all complex numbers on the stack will change presentation.

6 people found this helpful

Helpful

SimpleMan

Should be RPN only and 16 digits precision

Reviewed in the United States 🇺🇸 on August 21, 2022

Item Package Quantity: 1Verified Purchase

One of the great tragedies of life is that Hewlett Packard has lost their soul when it comes to proper high-quality calculators. For extremely precise calculations most computers and older HP calculators use double precision real numbers at 16 digits of precision. The HP35s is restricted to 12 digits of precision. Also, it was a serious mistake to create the HP35s with algebraic format as an option. Real calculators should be RPN exclusively. One annoying result is that an unshifted key is used for parenthesis, but the STO (storage to a register) key is relegated to a shifted key. In any routine calculations during RPN mode this adds an unnecessary key stroke each time a storage register is used. So, the algebraic compromise hurts the efficiency and elegance inherent in RPN calculations. That said, I am approaching retirement and only need a reasonable calculator. This HP35s will fill that niche given that my need for extreme precision and maximum efficiency will be limited. This is the best option I have found for an RPN calculator.

7 people found this helpful

Helpful

Cheryl Sharpe

Like RPN? Need a new calculator? Here you go...

Reviewed in the United States 🇺🇸 on September 30, 2020

Item Package Quantity: 1Verified Purchase

My first handheld electronic calculators were TI scientific calculators, but I really wanted HP, mostly because of RPN and overall quality. I finally got my first HP in 1978, an HP-67 programmable calculator (which I still have, but unfortunately, it no longer works). In 1987 (?) I got an HP-15C, which I still have...and still use. It's a wonderful calculator, and is no longer being manufactured by HP. I was looking for another (second) RPN calculator, and happened onto this item on Amazon. After a quick perusal of the reviews, and a bit more research, I ordered one. It's very nice. If you're used to the HP-15, HP-67, HP-41, there is almost no learning curve with the primary functions of this calculator. If you need the financial wizardry of the HP-12C, stop here, and go order one of those. Otherwise, for scientific and math purposes, this calculator does very well. Unlike the other HP calculators I mentioned, this one additionally handles fractions as fractions (if desired), has a better way of displaying imaginary/complex numbers, has metric<->US unit conversion (which admittedly is mostly useful here in the USA, or in other countries when attempting to understand our silly measuring system), and has a lot more storage. It feels a bit cheaper than older HP models, but its keys feel better (to me, anyway) than the flat screen on a smartphone's calculator app. The unit also weighs a lot less than a smartphone with a battery pack attached. It comes with a nice sleeve-style case, similar to the HP-15C. This device does work in Algebraic mode, so if you need to loan it to someone who doesn't understand RPN (or if you don't understand RPN), it's still good for that. However, there are probably better choices for non-RPN calculators if you have no use for RPN. For numerical base conversion (binary, octal, decimal, hexadecimal only), it's not overly difficult to use, but does require reading about how to do it. There are a few extra keystrokes required that are far from obvious.

In short, it's a very good RPN calculator, that will be easy to use for HP fans, others not so much. It's inexpensive for what it is. For basic scientific calculations, it's trivially easy to use for those proficient with RPN, but other functions (base conversion, equation solving, programming, fractions), you'll need to refer either to the (very good) online manual or other online reference.

17 people found this helpful

Helpful

Top reviews from other countries

Dan

Far far too slow

Reviewed in the United Kingdom 🇬🇧 on March 30, 2021

Item Package Quantity: 1Verified Purchase

The media could not be loaded.

If you're reading this or looking at this calculator you almost certainly know what a RPN calculator is. Let's get to it.

The scientific and programming features are great, but there's one major drawback with this model. Looping is slow, and when I say slow I mean slow. Unreasonably so.

The included video compares running a program to find the 400th Fibonacci number on a HP 12C (modern ARM version) and this HP 35S. The results speak for themselves.

The programs used in this demo are:

12C:
01. 1
02. x<>y
03. 0
04. x<>y
05. STO 0
06. ROLL UP
07. +
08. LSTX
09. x<>y
10. RCL 0
11. 1
12. -
13. x==0
14. GTO 16
15. GTO 05
16. ROLL UP

35S:
F001. LBL F
F002. STO(I)
F003. 1
F004. 0
F005. +
F006. LAST(x)
F007. x<>y
F008. DSE(I)
F009. GTO F005
F010. STOP

It's great to be able to buy a new RPN calculator but this performance is just awful, I suggest looking at SwissMicros options,

9 people found this helpful

Jack C

Classic HP Reverse Polish Notation Scientific Calculator.

Reviewed in the United Kingdom 🇬🇧 on November 24, 2017

Item Package Quantity: 1Verified Purchase

Superb HP RPN (Reverse Polish Notation) calculator. Fully programmable, in fact that's the main point of it. Can be used as a standard scientific calculator, but you'll have to learn to use RPN as this is not an algebraic calculator. You want to find the Sine of 45 degrees, you need to type 45 then hit Sin. You want to do the squareroot of (123+343-32) you press 123, enter, 343, add, 32, subtract, squareroot. You don't use brackets with RPN, it's quicker with complex embedded problems, when you have invested a couple of hours to really get used to it. Wonderful HP manuals available for download. Enjoy learning this powerful beast. Understated. You feel like you are programming something from 1983, which is part of the nostalgic joy of HP calculators. Thank goodness they still make them. A calculator with soul for those with a brain.

8 people found this helpful

Andrew Rolfe

Almost perfect and amazing value

Reviewed in the United Kingdom 🇬🇧 on November 25, 2020

Item Package Quantity: 1Verified Purchase

Despite having a couple of HP calculator emulations on my iPhone, it somehow isn't the same. My "every day" calculator (HP 42s) was beginning to play up, getting increasingly difficult yo read the display, so time for a new one. In general the HP35s is better in nearly every way – particularly in flexibility and ease of use, and it is AMAZING value – I paid over £100 for my HP42s over 30 years ago!
There are only a couple of niggles; conversion from litres to gallons (and back) is in US gallons only. This is mildly irritating as we buy petrol in litres, but then work out mileage in miles per gallon. It isn't a difficult calculation, but having it teasingly built in is annoying.
My only other complaint is that I wish it was built to the same standard of HP calculators from the 1970s and 80s, it just feels a bit plasticy. I would happily pay more for better plastics and an olde style soft click of the buttons of yesteryear.
As to RPN, it is clearly better, easier, more efficient, more logical and elegant than algebraic entry (as 100% of people who know and use RPN will agree), but for those too timid to dip their toes in the RPN pool, it can work algebraically too.

One person found this helpful

stewjw

It does the job

Reviewed in the United Kingdom 🇬🇧 on August 26, 2019

Item Package Quantity: 1Verified Purchase

I'm slowly getting my head around what it can do. As a scientific calculator is does the job. RPN is much quicker than the more traditional algebraic method and it can be switched between the two modes. I bought it for the RPN functionality which is generally quicker. It's also programmable which is a nice feature although limited to 32K and there is no way to save the programs to an external stroage device. If you need that functionality see the Swissmicro calculators. . I like the solid, quality design and the keys feel good. There are lower cost and much cheaper scientific calculators out there but this ones strikes a nice balance for me in terms of quality, what I need it for and speed of operation. It included a quick starter guide in both English and French, 2 x CR2032 batteries and a nice sleeve case. There was also a CDROM (never used) containing the full manual which can also be downloaded from the HP web site.

One person found this helpful

Maarten

Great value and very usable, but not as good as HP calculators used to be

Reviewed in the United Kingdom 🇬🇧 on February 19, 2021

Item Package Quantity: 1Verified Purchase

I really like this calculator, it does a lot and is easy to use. Good value too, for what it is able to do. The only reason I am not giving it the full 5 stars is the build quality, which is not comparable with my old HP calculators. It feels cheaper and lights and you do need to check the keys when you receive this item, because sometimes some or more keys are not as responsive as they should be. I have only had this calculator for about a year, so I cannot say whether it will last as long as other HP calculators, but I suspect it may not.

Still more than happy to recommend it for those who would like to learn using RPN, which I still think is by far the superior method for solving problems on a calculator.

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