Table of Contents

HP-20b Financial Calculator

Quick Summary


Manufacturer: Hewlett-Packard

Type: Financial Calculator

Model: HP-20b

Part number: F2219AA#ABA

Link to product:click here

The HP-20b Business Consultant calculator


The HP-20b “Business Consultant” calculator was released in July 2008. The calculator offers a number of features for financial and business users:

bondsyield and accrued interest
interest conversionlist-based cashflow analysis
cashflowsbreak-even analysis

In addition to financial functions, it includes a collection of statistical and mathematical functions:

list-based 1 and 2-variable statisticsmean
standard deviationpopulation deviation
standard errorforecasting
correlations and covariancebasic math functions: +, -, X, ÷, %, 1/x, +/-, square root
random numberhigher math functions: LOG, LN, 10x, pi, trigonometry, probability

Users Manual

Hewlett-Packard has a collection of official HP-20b information posted here.

Errata, hints and kinks

Learning Modules

A series of very informative learning modules have been created by Gene Wright for HP. These modules expand in much greater detail on the features and functionality of the calculator. Each includes many examples, and the modules are divided into common use cases.

Hacking (repurposing) the HP-20b

The HP-20b is a new breed of calculator for Hewlett-Packard, and one that reflects a casual open maturity. A group of HP calculator enthusiasts have begun work on repurposing the HP-20b for other uses, primarily enabled by accessing the JTAG connector on the main circuit board. This is a work in progress, although the group is actively soliciting individuals to help with this effort.