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HP 20b

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Title: HP 20b  
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Subject: HP calculators, HP 30b, HP-27, HP Continuous memory, HP-45
Collection: Hp Calculators
Publisher: World Heritage Encyclopedia

HP 20b

Type Financial
Manufacturer Hewlett-Packard
Introduced 2008
Discontinued 2011
Cost $40
Entry mode RPN Chain Algebraic
Display Type LCD Seven-segment display dot-matrix display
Display Size 12+3 digits and 8 characters
Processor Atmel AT91SAM7L128 30 MHz processor
Memory Register 50 pairs of statistical data + 10 registers
Connection 6-pin RS-232
Power consumption 0.25mW
Weight 113.2 g
Dimensions 14.92 x 7.70 x 1.6 cm

HP 20b Business Consultant is a financial calculator published in 2008 by Hewlett-Packard. Its function is similar to HP-10BII and includes scientific and statistical functions.


  • Hardware Specification 1
  • Functions 2
  • Criticism 3
  • Examination approval 4
  • Repurposing as the WP-34s 5
  • References 6
  • External links 7

Hardware Specification

HP 20b uses a 2 lines display with the first line an 8 character scrolling display and 11 indicators and the second line for 12+3 digit display. It also uses 2 CR2032 batteries, an Atmel AT91SAM7L128 30 MHz processor. The processor's serial interface is accessible from under the battery cover to allow the firmware to be updated using a special cable from HP.


The HP 20b contains functions similar to HP 10BII, with Financial functions including: TVM, IRR, NPV, NUS ("Net Uniform Series" [1]), amortization, depreciation, bonds, yield and accrued interest, interest conversion, list-based cashflow analysis, cashflows, break-even analysis. The solvers are very fast: you enter the data you know (e.g. interest rate, PV, PMT) and it automatically solves the variable you didn't enter (e.g. FV).

Math/Statistics functions include: list-base, 1 and 2 Variable statistics, Mean, standard deviation, population deviation, standard error, Forecasting, correlations and covariance, +, -, X, ÷, %, 1/x, +/-, scientific notation, n!, combinations, permutations, rounding, random numbers, LOG, LN, 10x, PL, square root, Trigonometry, probability.[2]

For input modes, it supports RPN Chain Algebraic input.

It also included several added features include: date calculation, display format and language preferences, memory functions, editing, scroll keys.


Many users claim that they dislike the model because it lacks the feedback when pressing the keys, and the menus make things complicated[3]

Examination approval

HP 20b is approved by the Hong Kong Examinations and Assessment Authority and can be used in Hong Kong Certificate of Education Examination of 2009 or later.[4]

HP 20b is approved by the Global Association of Risk Professionals (GARP) and can be used for the Financial Risk Manager (FRM) certification exam.[5]

HP-20b with overlay for WP-34s

Repurposing as the WP-34s

Along with the HP 30b, the HP-20b calculator is particularly conducive to repurposing, since both the hardware and software are made public by HP. Several projects have been started around reusing this calculator for other purposes. The most advanced is the WP-34s, a Programmable Scientific calculator that combines the functionality of the HP-42S and HP-16C and includes many other novel features and functions.[6] The letters WP refer to the first initials of two of the principal designers of the WP-34s firmware.


  1. ^ [1]
  2. ^ HP 20b Functions
  3. ^ Criticisms of the HP-20b
  4. ^
  5. ^
  6. ^ WP-34s repurposing project

External links

  • Product specification
  • Simulators for Windows and/or iPhone OS from HP
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