Compounding Interest Formulas for Varying Annual Deposits and Interest Rates

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Discussion Overview

The discussion revolves around the formulation of compounding interest calculations for varying annual deposits and interest rates. Participants explore different scenarios involving initial deposits, annual contributions, and the application of these formulas in Excel.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant proposes a formula for compounding interest with an initial deposit of $1000 and annual contributions of $10,000 over 10 years, seeking guidance on how to set this up.
  • Another participant reiterates the same scenario and suggests that it can be easily implemented in Excel by using a formula that references the previous cell for interest calculations.
  • A different participant inquires about a scenario where only a $10,000 deposit is made annually for 10 years, while still compounding at a consistent yearly rate.
  • The same participant confirms the previous instructions for setting up the compounding interest in Excel, emphasizing the simplicity of the process.

Areas of Agreement / Disagreement

Participants appear to share similar views on the approach to setting up the compounding interest calculations in Excel, but there are variations in the specific scenarios being discussed. No consensus is reached on a single formula applicable to all proposed situations.

Contextual Notes

Limitations include the lack of clarity on the specific interest rates and the exact formulas being proposed, as well as the dependence on the definitions of compounding and deposit frequency.

Who May Find This Useful

Individuals interested in personal finance, investment strategies, or those looking to understand compounding interest calculations in practical applications, particularly using Excel.

Eph
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I think I found a simple formula if I was putting in the same amount of money each year, but what if I wanted to start with 1000$, add 10k$ for 10 years, and then watch it compound at X interest; how would i set that up?

And if you know, can you put this formula into Excell.
 
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Eph said:
I think I found a simple formula if I was putting in the same amount of money each year, but what if I wanted to start with 1000$, add 10k$ for 10 years, and then watch it compound at X interest; how would i set that up?

It's very easy to do with Excel -- just have the first cell with the starting amount, then for each cell below it have the interest formula beneath, referring to the cell above as principle, and add in the amount you deposit each year.
 
What about if you want to just put in a deposit of say 10k per annum for 10 years but have it still compound at the same yearly rate?
 
Eph said:
What about if you want to just put in a deposit of say 10k per annum for 10 years but have it still compound at the same yearly rate?

Yep, just like I said. Follow the instructions above.
 

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