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approach. Why not start over from scratch, given the programability of the iphone/ipod/ipad? With Investment Return you input your buy and sell dates using innovative Apple Date Pickers and your holding period is computed for you to the day! See a Video Demonstration of the Investment Return iPhone App at: http://www.youtube.com/watch?v=2Y44JTDfitA You need an iPhone, iPod Touch, or iPad to be able to buy this application. You can buy this iPhone/iPod Touch/iPad app by searching "Investment Return" on the Apple ITunes store. The cost is 0.99 USD, 0,79 EUR, 0.99 CAD, or 0.69 GBP . Are you tired of using the same kind of financial calculator you used 15 years ago in Business School? Investment Return is a whole new breed of 21st century Financial Calculator. Older financial calculators, even some available on the iPhone, forced you to deal with obscure buttons and a single numeric input field. Investment Return uses the powerful programming tools of the iPhone: Date Pickers, custom Financial Prompts, and dynamic Date Calculations to frame the financial problem in a form that you understand. Investment Return calculates your compound interest return on an Investment, after computing your holding period to the day. There is another Investment Return calculator that takes Dividends into account and a Retirement Calculator that lets you plan your retirement to the day! If you understand that compound interest is the correct way to calculate the return on your investments, then Investment Return is the calculator for you. A Finance App buyer has an obvious concern about the accuracy of the calculator and whether the app works the way the screen shots and description imply. This developer humbly submits that Investment Return has had significant sales, including International sales, and that no one has commented about any problems nor requested any fixes from the developer. Investment Return solves three common problems that Investors are concerned with: What is the Return on my Investment? I bought a stock 3 and ½ years ago for x and sold it for y today. What was my compounded annual return on that investment? Inv. Return solves this problem and allows you to input your buy and sell dates using convenient iPhone Date Pickers. After inputting your Buy and Sell price you are presented with your annual gain, using daily compounding for that investment along with your holding period in days and years. The compound return calculations presented by Investment Return are based on industry standard compound interest formulas and can be shown reconcile with standard financial tools such as an Hewlett Packard 12c ® and the Microsoft Excel ® spreadsheet for specific problems. What is my Return on an Investment that pays a Dividend, Interest Payment, or Rent? Dividend uses all the features of the calculator above but adds the feature of being able to add a Dividend, recurring Interest, or Rent payment to the calculation. You input your buy and sell date, your buy and sell price, and the annual recurring dividend/rent/interest payment you received for holding that investment. You are then presented with your annual gain, which includes both your capital gain and the return from your dividend/interest payment/rent. What will my Retirement Nest Egg be? There are many Retirement Calculators. But have you ever met one that let’s you specify the Day of your Retirement? The Investment Return Retirement Calculator takes your current retirement savings balance, your planned annual contribution until retirement, the Interest Rate you expect to receive on your retirement investments, and then let’s you input your planned retirement date on a Date Picker. From these inputs Retirement calculates the amount of your nest egg at the future date using industry standard future value calculations. Spin the year column of the date picker slowly forward or backward and watch how that affects your nest egg. The three calculators, Inv. Return, Dividend, and Retirement along with a Help screen are presented with an easy to use Tab bar at the bottom of the screen that allows you to easily switch between the calculators. The formulas used in Investment Return are taken from “Managerial Finance” by Weston and Brigham (Now “Essentials of Managerial Finance” by Besley and Brigham). “Managerial Finance” is an undergrad Finance and MBA level textbook. The Inv. Return and With Dividend calculators use the Present Value of $1 (PVIF) formula, solving for “r”. The Retirement Calculator uses the Compound Sum of $1” (CVIF) and Sum of an Annuity of $1 for N Periods (CVIF sub a) formulas. This App pays for itself the first time you use it.   You make investments worth 1,000's of Dollars/Euro's/Pounds/Loonies/etc.  or more.  Let's take an example. You made a 40% total return in 2.5 years or you made a 40% total return over 10 years, how did you really do?  This App tells you how you did using the financially correct, compound interest methodology that can be compared across investments. Are you beating CD's?, Money Market Funds?, Fixed Rate Bonds?, TIPS?, Major Market Indices?, other investments you made or can make? This App tells you (I'm assuming you know those other returns).  This app pays for itself the first time you use the Retirement Calculator to understand and model your Retirement financial situation at a specific date in the future. All the calculations you make after the first one are gravy.