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If you want to include Erlang calculations in your own Excel Spreadsheet, Access Database, or other Windowstm application, you will find the hardest part is writing the mathematical code so that you don't get underflows and overflows. The simplest solution is to buy some Plug-Ins (pre-compiled DLLs). These Plug-Ins use exactly the same source code used in the Erlang Windows Program but because they are pre-compiled, integrating into your application is easy.

Call Center Plug-In now available

The Call-Center functionality (available in the Windows program) is now available as a new module.

Free Demo Kit

Download your free Plug-Ins Demo Kit now.

Key Benefits

  • Works with Microsoft Visual Basic. This means you can easily access the Erlang math functions from your MS-Excel spreadsheet, MS-Access Database, Microsoft WWW server, MS-Word Document, or any other application that supports Visual Basic. Example.

  • Works with C/C++. Build your own Windows application. Some companies have the need to build custom Windowstm applications that require Erlang calculation functionality. You can write this application in C/C++ as you would any Windows program. Example.

  • Concentrate on your application, not the unwieldy numerical calculations. Finding the equations is not that hard (See Recommended Reading), but solving these equations without numerical overflow is hard. Some equations have no simple solution; it is necessary to iterate to find an answer. All these problems are solved if you just purchase the required numerical Plug-In modules. You will find it is much cheaper than writing and debugging the code yourself. 

    Here is what one customer had to say.
    "The call center excel plug-in saves me a lot of time
    forecasting every week. I forecast in 30 minute intervals,
    and I used to plug the figures for each interval into
    a call center calculator one by one. Now that I have
    ability to do erlang algorithms as a function in a
    spreadsheet, I do each week's forecasting with the
    click of a macro button. This product very valuable to
    someone like me staffing a call center too small to
    justify the purchase of a workforce management software.
    Great Idea, thanks."
  • Support. You get unlimited support to make sure you can get your Plug-Ins to work. Here is what one customer had to say.
    "Thanks for all of your support. You have done much better than
    Microsoft in this respect."

Example Usage

The Plug-Ins are accessed like any other Windows DLL. Click here to see examples of calling an Erlang DLL function via ANSI-C or Visual Basic.

To try it for yourself, download a free Plug-Ins Demo Kit now.

Licensing Policy

You can buy two types of Plug-Ins. Both are functionally IDENTICAL. The ONLY difference is that Unlimited Plug-Ins will operate without a registration code.

  1. Personal Plug-Ins. These are for users who want to use the plug-ins for personal use (at home or work). To use a Personal Plug-In, a valid V4.x Erlang Windows Program license must also be installed on the same PC. Personal Plug-Ins are purchased as a set that covers all 7 models.

  2. Unlimited Plug-Ins. These do NOT require a license, and may be used and distributed as part of your software product. They are intended for organizations that want to include Erlang calculations in their own software product, and realize that it is cheaper to 'Buy, not build'. There are no royalties, or other per-copy charges. Unlimited Plug-Ins are available for purchase on a 'model-by-model' basis; i.e. you can purchase only the models you need. 
DLL Type  Limited to 10 Erlangs ? 

Requires Erlang Windows
Program License

Free Demo Yes No
Personal No Yes
Unlimited  No No

Available Models

  • Erlang B
  • Poisson
  • Erlang C
  • Engset
  • Binomial
  • Delay
  • Call Center (Note: Requires Erlang C module, which must be purchased additionally)

More Information

Download a free DLL Demo Kit. This kit includes:

  • Sample Excel and Access files
  • Full Help file, with descriptions of all available functions
  • Complete description of all the functions available for the Erlang C model.
  • Complete ANSI-C header file
  • Complete Visual Basic include text example
  • Many examples of how to call the functions
  • Instructions on how to compile and link a DLL into your C/C++ windows application


Product Price
Request a Quote
Personal Plug-Ins, Set of 7 modules $20 Shop Online
Erlang-G License (Required for Personal Plug-Ins) $30

Unlimited Plug-Ins

Erlang-B module $660
Poisson module $660
Erlang-C module $660
Engset module $660
Binomial module $660
Delay module $660
Call Center module
[Note: Requires Erlang-C module]

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Last modified: January 17, 2006