I'm building a finance calculator, where my models compound growth over time and checks retirement projections against the 4% rule. I built 4 different calculation based tabs. Additionally, I used streamlit to launch my website. I used only python for this project.
After quite some time Im finally done with the project. I spent quite a long time writing the README since I wanted it quite detailed and didn’t want to leave any information out. Additionally, I deployed my local host through streamlet’s community cloud and got it an actual URL. Growthcalc.streamlit.app. During the streamlit process I also learned the difference between owner controls such as editor, manage, and share. I also figured out the visitors POV as well. All in all, I had a lot of fun with this project and learned a lot finance wise and coding wise.
I built probably my last tab, the Loan payoff Calculator. I had a LOTTTT of bugs with my formula and the overall persona of the concept. There was a confusing /$ display in a few places but I fixed it after some trouble. Apparently streamline treats $ the same way as st.write/st.errors/st.success. I also ended up building the amortization loop with monthly splits for fixed payment and interest based on the remaining balance. Im probably going to spend some time trying to turn this into a final website type project, which I’ve never done before.
This is a big devlog post but I finished two more tabs: A retirement checker tab and a Tax advantage Comparison tab. For the retirement checker I aded the 4% rule comparison logic to it. During the coding I ran into many many bugs, one of them being a dollar sign error and I took rlly long to fix. Also I realized halfway through that the retirement mode was using the return rate and monthly contribution from another tab and it was messing everything up. For the tax advantage tab, I ran two columns where one is tax growth every year, and the other is taxes only at withdrawal. Making the tax loop was incredible hard and it took a long time. Additionally, for th equations themselves, it was all new information for me and I spent way too long writing the wrong equations over and over.
This is my first devlog for growthcalc. I’m basically making an investment calculator. The initial calculation will use compound interest logic with 4 sliders to predict future value of an investment. Along with the math I also added a chart which looks really cool and puts the growth into perspective.
