Xenakis Professional Debt Calculator - ProDebtCalc

The Xenakis Professional Debt Calculator is a sophisticated financial application for analyzing all kinds of retail debt transactions, including mortgages, credit card loans, car loans, and credit car loans.

Any transaction can be modified with additional advanced clauses, including closing fees, recurring fees, income streams, and payment streams. "Create your own calculator" consists of any number of advanced clauses.

Interest assessment clauses specify rules for assessing interest, including fixed or adjustable interest rates, assessment or billing cycle schedules.

PDC computes and displays amortization tables and APR in conformance with federal regulations.

As an bonus feature, PDC displays Zillow data for any state, city and neighborhood via a web service. The data includes median price and price change data for various types of homes, census summary for the neighborhood, and a variety of demographic data values, including commute times, divorced/married ratios, and average age.

Optionally, you can e-mail any data set to yourself or a third party for reference.

NOTE: THIS APP IS STILL UNDER DEVELOPMENT, AND NOT FULLY IMPLEMENTED OR DEBUGGED.

Updated Versions

• Version 2.0, March 6, 2016 Professional Debt Calculator supports a wide variety of financial options, and produces APRs and amortization tables according to federal regulations. The new version implements fund sources for fees (out of pocket, add to balance, etc.), and improves the user interface.
• Version 1.9, February 5, 2016

  The new version fixes several important system bugs, and continues implementation of calculators, including the car loan and reverse car loan calculators.

• Version 1.8, January 27, 2016

  Implement additional options in advanced interest rate computation settings, and also improves and fixes bugs in internal thread handling.

• Version 1.7, October 25, 2015

  Several enhancements and bug fixes in saving and reloading calculators in the "save your own calculator" function.

• Version 1.6, October 15, 2015

  Improvements to user interface, especially in amortization table. Improvements in saving and reloading in the "create your own calculator" function.

• Version 1.5, August 30, 2015

  Major feature implementation: Ability to "save" a transaction and "load" it later. You can create your own calculator by adding advanced clauses to a standard calculator, then save the calculator and use it later.

• Version 1.4, August 17, 2015 - Numerous bug fixes, lots of cleanup.
• Version 1.3, July 6, 2015 - Fix bugs, add features.
• Version 1.2, June 21, 2015 - Fix bugs, add features.
• Version 1.0, June 16, 2015 - Initial version

LINKS

The following pages describe the individual functions of the Professional Debt Calculator:

Mortgage Calculators

Credit Card Calculators

General Loan Calculators

'Create your own calculator': Advanced clauses and interest rules

Financial algorithms and Developer Data

XENAKIS MATHGAME FOR ANDROID

Xenakis MathGame -- an Android app to test your math skills!

Warning: If you like math, then you'll like this game, but if you don't like math, then you'll hate this game.

Xenakis MathGame on Google Play: https://play.google.com/store/apps/details?id=com.jxenakis.mathgame

OTHER LINKS:

Xenakis Professional Debt Calculator on Google Play: https://play.google.com/store/apps/details?id=com.jxenakis.prodebtcalc

John J. Xenakis resume: http://jxenakis.com/resume

Standard input and output fields

Many of the calculator use the similar input and output fields. The following are the most common input fields:

• Amount -- Specify the dollar amount of the loan.
• Start Date -- This is the starting date of the transaction.
• Loan Length - Years -- Specify the length of the loan in years.
• Loan Length - Months -- Specify the length of the loan in months.
• Annual Interest Rate -- Specify the nominal annual interest rate for the transaction. This is the most common case, when there's a fixed interest rate. For more complex interest rate rules, including adjustable rates, select 'Show Advanced Options', and press the button for interest rates and rules.
• Payment or Monthly Payment -- Specify the dollar amount of the periodic payment. In the case of mortgage loans or credit cards, this is usually a monthly payment.
• Checkbox: 'Show Advanced Options' -- Selecting this reveals the buttons that let you add advanced clauses to the transaction.

The following are the most common output fields:

• Time Stamp -- The date and time when the amortization computations were performed.
• Start Date -- The start date of the entire transaction. Note that individual clauses in the transaction may have different start dates.
• End Date -- The end date of the transaction. Depending on the type of calculator, this might be a date that you specify (such as your retirement date) or it might be the date when the transaction balances.
• Number of Payments -- The number of payments during the term of the transaction.
• Number of Fee Payments -- The number of fee payments during the term of the transaction.
• Computed amount -- The dollar amount computed by the calculator, depending on the type of calculator. It might be a computed monthly payment, or it might be the amount of the initial balance (or cash advance) in the case of 'how much can you afford' calculators.
• Computed amount - last period -- In the case where the calculator is computing a monthly payment, the monthly payment in the last month may be slightly different from the other monthly payments because the calculated monthly payment is rounded up to the next penny, so the last payment has to be smaller to balance the transaction.
• Total payment -- This is the total of all payments made during the transaction.
• Total interest payment -- This is the total amount paid in interest during the transaction.
• Total fees -- This is the total amount paid in fees during the transaction.
• Total advance -- This is the total amount of cash advances and purchases made during the transaction.
• Amount financed -- This is the total amount financed. Usually it's the same as the total advance, but the amount financed may also include some fees that are financed.
• Total Finance Charge -- Total amount of interest and fees.
• Monthly APR -- This is the Annual Percentage Rate (APR) divided by 12, if the unit period in the transaction is a month. If the unit period is something else, then this is the APR per that unit period.
• Annual Percentage Rate (APR) -- This is the Annual Percentage Rate (APR), computed according to the federal regulations in the Federal Reserve Truth in Lending Law.