Archive for the ‘Calculators’ Category

The Models and Families of HP Calculators from 1972 to 1986

Wednesday, December 7th, 2011

HP released their first few handheld calculators with model numbers like the HP-35 and HP-80. These models looked the same but had different features as one is a technical calculator and the other is a business calculator. It did not take long before other HP calculators were released. There were models that came out like their small desktop calculator with built-in printer and the smaller handhelds. HP was expanding their calculator production until there were too many models to remember. To make it convenient and easy to remember, HP decided to classify their calculators into a “family” or a series.

Here are the Families and Series Names of different HP calculator models:

The Classics

This family consists of the first few handheld calculators like the HP-35 which is the first handheld HP scientific calculator. Then there is the HP-80 (first HP business calculator), HP-65 (first programmable handheld), HP-45, HP-70, and HP-55.

Classic Printers (Printing Desktop Calculators)

This family consists of desktop calculators with built-in printers. The HP calculator models under this series are the HP-46 and HP-81. These two models are the printing versions of the HP-45 and HP-80. The HP-81 was considered a top-of-the-line desktop printing calculator because HP added more functions to it.

Woodstock (Second Generation Handheld Calculators)

This family consists of the second generation series of handheld HP calculators like the HP-21 (second generation HP-35) HP-22, HP-25, HP-25C (HP-25 with continuous memory), HP-27 (the “Do Everyting” model with sci/stat/bus/math functions), and HP-29C (high end programmable).

Topcat (Second Generation Desktop Calculator)

This family consists of top-of-the-line HP desktop calculator models HP-91, HP-92, Hp-97, and HP-97S. These calculators are also known as the 90’s series. This family has a printing scientific calculator, printing business/financial calculator, and I/O calculator.

Spice (Third Generation HP Calculators)

This family is also known as the 30E/C series because the models included in this line of HP calculators are the HP-31E, HP-32E, HP-33E/C, HP-34C (scientific programmable with integration and solve), HP-37E, and HP-38E/C. This series consists of improved HP scientific calculators, statistical, scientific programmable and financial calculators.


This family consists of two handheld calculators, the HP-10 and HP-19C. The HP-10 is a handheld printing adding machine while the HP-19C is a high end programmable calculator. Both are handheld printing machines, the difference is that the HP-10 is a simple adding machine while the HP-19C is an advanced calculator with programmability.


This family has the models HP-41C, HP-41CV, and the HP-41CX. These models are packed with features because they were HP’s solution to the lack of keys and functions on the HP-67. These calculators made it easier to write and use numeric-only programs. It made programming, typing of functions, and keyboard assignments easier for the user.


This family, also known as the 10C series, consists of the HP-10C, HP-11C, HP-12C, HP-15C, and HP-16C. This series has a basic scientific programmable calculator, more advanced scientific programmable, top selling business calculator, scientific with matrix & complex math, and a computer scientist calculator. The calculators in this series look similar to each other but if you look closely, the keys are placed differently for each model.


This family consists of HP calculators that fold, also known as the clamshell series. Models in this family include the HP-18C (business model with solver) and HP-28C/S (scientific with symbolic math and solver). These two totally changed the way HP scientific calculators looked because when you open it you can see the number keys on the right and the letter keys on the left.


This family consists of lower end series models, including those models ending with B (business), S (scientific) and II. Models included in this series are the HP-27S, HP-17N, HP-22S, HP-42S, HP-32S, and the HP-14B. The different types of calculator in this series includes an algebraic do everything calculator, algebraic scientific, algebraic business, and RPN scientific with complex math.

The families here only run up to 1986. There are two other names that can be found in the HP calculator series names, Quake and Pogo. However, it shows that calculators under these families never went into production. Based on the families mentioned, the obvious trend in determining the family of HP calculators depend on how they look, what they can do, and the trend in model names. This makes it easier for consumers (then) and collectors (now) to remember HP calculator models.


The HP Calculator Database: Anything about HP Calculators

Tuesday, December 6th, 2011

Hewlett –Packard is one of the major manufacturers of calculators. In 1972, the company was one of the first to successfully design a handheld calculator that performed more than the four basic functions. It was called the HP-35 and it was the first pocket HP scientific calculator. Following the calculator’s success, the company started designing other calculators with different features to address other computing needs.

The HP-35 was smaller yet a powerful computing device compared to those first calculator models introduced in the 1960’s. From this handheld device, HP continued to produce different models like their first HP business calculator, the HP-80. This model had formulas set for users who are in the business/finance industry. After this model, HP continued to improve their calculators by adding functions, more keys, print options, and programmability options.

Over the years, with the progress of technology, HP calculators became more and more portable without compromising functionality. HP calculators performed the four basic functions, algebraic, trigonometric, logarithmic, statistical, financial, and scientific so users can solve for the information they needed in whatever industry they are involved in. From 1972 to this day, there are over a hundred HP calculator models.

There is actually a database for HP calculators set up by collectors. The calculator database is where you can find all HP calculator models and a summary of features, introduction date, and photos of each model. This is helpful for those who want to know more about HP calculators, how they advanced through the years, their differences and other information about different models.

The HP calculator database is a place where you can meet people who like collecting the calculators. People who know about these calculators can also contribute information on the database to help others on their collection. HP calculators are found to be valuable because they have the potential to become a collector’s item. So if you find an HP calculator and thought of getting rid of them, especially the old models, try to get rid of them online instead because there might be collectors who are interested in your old calculator.


Understanding HP Calculator Model Numbers and Letters

Monday, December 5th, 2011

HP calculator and computer models have numbers and letters after the brand name, HP. The company used this technique so consumers can easily distinguish one model from another. Through the history of HP calculators, there are some models that have numbers while others that have both numbers and letters. These numbers and letters have corresponding meanings that may prove helpful to consumers and those who collect all kinds of HP calculator.

HP did not just assign random numbers and letters as model names, like the first handheld HP scientific calculator, the HP-35. It got the model number because it had 35 keys. However, the rest of the early handheld models, like the HP-80, HP-45, HP-65, HP-90, did not get their model numbers from how many keys they had but were different from each other nonetheless.

The company’s calculator line-up grew from HP scientific calculators to business calculators, and then there are those with different features like programmability and printing. Some calculators are improved versions of previous models, and to make a distinction, HP added letters after model numbers like the HP-25C. This model was taken from the HP-25 and added a “Continuous Memory” feature, thus the letter C at the end. Later on, all models with “Continuous Memory” had a C after the model numbers like the HP-29C and HP-19C. Another example is the HP-97 and HP-97S where the HP-97S had a serial interface.

The first series of HP calculators that had letters after model numbers are those in the Spice or 30 series. The first four HP scientific calculators in this series did not have continuous memory like the HP-31E and HP-32E. Those that did have continuous memory had the letter C after the E, like the HP-33E/C and HP-38E/C.

Another HP calculator series with numbers and letters are the HP-41C, HP-41CV, and HP-41CX. The HP-41C was an improved version of the HP-67. It had 3 shift keys adding more functions to the calculator. The HP-41CV had data registers five times more than the HP-41C, the “V” was for Roman number five. With the HP-41CX, the X means “Extended” because this model was like the HP-41CV with built-in extensions, extended functions, and extended memory.

The first HP calculator model to reuse a name was the HP-10C because there was already an HP-10. However, this model was similar to the HP-31E rather than an improved version of the HP-10. The HP-10C was a handheld basic scientific programmable with built-in printer, which was a simpler model of the HP-19C. People started adding A after the model names, like the HP-10 became the HP-10A to distinguish it from the HP-10C, and later on with the HP-10B (All three models are totally different from each other).

The HP-75C handheld computer was the next handheld model after the HP-10C. It was soon followed by the HP-71B and HP-75D. The HP-75D was like the HP-75C with a port for a barcode reader. The HP-94 model series followed the same pattern with the HP-94D, HP-94E, and HP-94F. The letters D, E, and F signify the three handheld models’ memory capacity having 64k, 128k, and 256k respectively. After this series, HP went back using just a “C” with the HP-18C and HP-28C.

The next series of calculators from HP used the B and S letters which stood for Business and Scientific, like the HP-19B and HP-28S. Then, the company stuck with the letters B and S for HP business calculators like the HP-10B, HP-14B, HP-20S, and HP-42S. After these, models like the HP-19BII, HP-17BII, and HP-32SII came out as improved versions (with RPN and algebraic notation) of earlier models without the II in the name. Models like the HP48SX stood for scientific expandable, the version without extensions were called HP48S. The next HP calculator models like the HP95LX and HP95LX1MB had a Lotus expandable feature and one model had 1 megabyte RAM. The models HP48G and HP48GX are new versions of the HP48S and HP48SX. The G stood for graphical calculator.

HP calculators started with numbers as model names, and then as their line of calculators grew they added letters after the numbers to mark improvements or added features. Understanding the trend on how HP calculators are named can help those who want to know about these calculators or if you want to start collecting, this information will guide you through different HP calculators and easily determine how different each model is from another.


Top Rating HP Financial Calculators

Saturday, December 3rd, 2011

HP calculators have been around for 30 years now and the company is known for making all kinds of creditable calculators. They have scientific calculators, business, financial, calculators with printers, with graphing capability and many more.

If you are looking for a calculator that accurately solves for complex mathematical, statistical, and financial calculations, you can never go wrong with HP calculators as they are designed to perform different functions depending on your needs.

Here are some of the top rated HP business and financial calculators:

HP 17BII+ Financial Calculator – This calculator is packed with features that any finance or business person will enjoy as it solves for the time value for money, amortization, and cash flows. Other functions solve for loans, depreciation, leasing, savings, variable compounding, yield to maturity, bond price and a lot more. It has a 28K memory, RPN and algebraic data-entry modes, and has a long battery life.

HP-12C Platinum Financial Calculator – this calculator has over 130 built-in functions. This HP calculator comes with different modes to perform different types of functions like programming, business/finance, statistical, and mathematical functions. This is ideal for those who need all kinds of business computations.

HP-10BII Financial Calculator – this calculator has different functions for business, finance, statistics and mathematics. Using this calculator saves you time because of the 100 built-in functions for all your business needs. Easily calculate for loans, interest rates, conversions, standard deviation, cash flows and many more. It features a 1-line, 12 character display so you can read results easily.

These HP business calculators are great for those who handle serious financial and business calculations. These calculators are designed to solve complex problems and provide quick and accurate results, saving you time while increasing productivity. Other than these calculators, there are HP printing calculators with business functions. The printing calculators are great for those who need to keep financial records for their business.


HP Calculators for Your Home and Office under $30

Friday, December 2nd, 2011

If you are looking for a calculator that you can use at home or your office, HP offers a line of calculators that will fit your needs. HP is one of the top companies in the calculator industry. Their calculators perform different functions that can solve for both basic and complex solutions making them ideal for anyone under different industries like science, math, business, finance, and many more.

Now, if you need a simple calculator that will perform basic computations, here are some HP calculators that you can get under $30:

HP EasyCalc 100 Calculator ($7.99) – this is a basic calculator that performs basic math functions. Small and lightweight, you can easily bring it anywhere you go. This one has a large 12-digit display to easily see results. It runs on solar power and comes with battery backup so you do not have to worry about changing battery in a long time. This is ideal for home, school, and office use.

HP OfficeCalc 100 Calculator ($9.99) – this performs simple calculations. It is compact and designed to look great on your desk whether at home or your office. You can even use it for your small business to compute for simple sales transactions. It is solar powered to extend your battery’s life and comes with a battery backup. The big display makes results easy to read.

HP OfficeCalc 200 Calculator ($14.99) – this HP calculator is ideal for business or office use. It performs basic math calculations that you need at home, office, or your retail shop. It has a large 14-digit display so you can easily view results. Solar powered to extend battery life and comes with battery backup. This calculator is great if you need something larger than the HP OfficeCalc 100. If you are concerned about design, the HP OfficeCalc 300 ($19.99) is worth a look.

HP CalcPad 200 Calculator ($29.99) – this is a calculator that doubles up as a numeric keypad. This is ideal for business professionals that are on-the-go. Use it as a calculator for basic calculations and use it as a numeric keypad for your laptop via USB. You can choose where to view your calculations, either on the calculator or on your laptop. Its compact and lightweight design makes it easy to carry around.

These HP calculators are simple yet they guarantee ease of use with fast and accurate results. Quality is guaranteed as well because all calculators come with a 1-year limited warranty. Check out other calculators like an HP business calculator or a printing calculator if you need to solve complex calculations and print results.


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