README.md (1536B)

1 # pengan 2 3 A python script that calculates compound interest on investments. 4 5 ## How to use (besides having python3 installed) 6 7 Clone and cd into the project folder 8 9 ``` 10 git clone https://git.sr.ht/~rickylinden/pengan && cd pengan 11 ``` 12 13 Make executable if needed and run the script as 14 15 ``` 16 python3 pengan.py 17 ``` 18 19 The script will ask you if you want to: 20 21 - a) See how much monthly investment becomes over time 22 23 - b) See how much you need to invest to reach a certain amount of money 24 25 Enter the values it asks for, if fields are left empty it runs with example values. 26 27 ## An example 28 29 You put 1000€ into an investment account that on average gives 5% annual 30 interest. Additionally you'll add 100€ per month for 10 years. 31 So if you started in 2021 you should have 16533.24€ in 2031. 32 33 ``` 34 $ python3 pengan.py 35 +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+ 36 |c|o|m|p|o|u|n|d| |i|n|t|e|r|e|s|t| |c|a|l|c|u|l|a|t|o|r| 37 +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+ 38 39 a) How much does a monthly investment become in x amount of years? 40 b) How long does it take to get a certain sum by investing? 41 42 Choose a or b: a 43 44 Starting amount (empty = 0€): 1000 45 Monthly sum (empty = 500€): 100 46 Years (empty = 30): 10 47 Average interest rate (empty = 5%): 5 48 49 After 10 years you should in total have: ~16533.24€. 50 Which means that in the year 2031 you'll get a monthly average of ~68.88€ in interest. 51 ``` 52 53 --- 54 55 [Formulas this script is based on]: https://www.thecalculatorsite.com/articles/finance/compound-interest-formula.php