Free Compound Interest Calculator Spreadsheet Template
Calculate compound interest growth over time with regular contributions. See how principal, interest rate, and compounding frequency affect total returns.
What's Included
- Dashboard with growth visualization showing starting principal, total contributions, total interest earned
- Setup sheet with principal, annual interest rate, compounding frequency, and regular contribution inputs
- Year-by-year projection table displaying beginning balance, contributions, interest earned, and ending balance
- Principal vs. interest breakdown showing how much of the final balance came from deposits vs. compound growth
- Multiple compounding frequency options including daily, monthly, quarterly, and annually for comparison
- Works in Microsoft Excel, Google Sheets, and LibreOffice Calc with no setup required
Preview
See what's inside this template
How to Use This Compound Interest Calculator Template
Enter the principal
Input your starting amount - the initial deposit or investment balance before any interest or additional contributions.
Set rate and frequency
Enter the annual interest rate and choose the compounding frequency - daily, monthly, quarterly, or annually.
Add regular contributions
If you plan to add money regularly, enter the contribution amount and frequency. Leave blank for principal-only growth.
Review the growth table
The year-by-year projection shows how the balance grows from principal, contributions, and compound interest over time.
Built by Claude AI. Perfected by us.
We use Claude AI to draft each free template, after a deep research. Then our team steps in. We refine the layout, stress-test every formula, fix edge cases, and polish the design until it feels like something we would actually use ourselves. The AI gets us 80% there. The last 20% is all human judgment.
Frequently Asked Questions
What is compound interest?
Compound interest means earning interest on both the original principal and previously earned interest. Over time, this creates accelerating growth.
Does compounding frequency matter?
Yes. More frequent compounding (daily vs annually) results in slightly higher returns because interest starts earning its own interest sooner.
How does this differ from simple interest?
Simple interest is calculated only on the original principal. Compound interest is calculated on principal plus accumulated interest, resulting in faster growth.
Can I see the interest-only portion?
Yes. The principal vs interest breakdown shows how much of the final balance came from your deposits vs how much was generated by compound growth.
How do I open this in Google Sheets?
Upload the .xlsx file to Google Drive, then open it with Google Sheets. All formulas and formatting will be preserved.
What license is this template under?
All free templates are released under CC BY 4.0 (Creative Commons Attribution). You can use, modify, and share them freely - including for commercial purposes - as long as you credit FinancialAha.com. They are provided as-is and do not constitute financial advice.
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