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Processed locally in your browserCompound Interest Calculator
Visualize long-term investment growth with monthly contributions, compound interest schedules, and annual balance breakdowns.
How to Use Compound Interest Calculator
1
Enter your starting investment deposit.
2
Set your monthly ongoing contribution amount.
3
Enter your expected annual return rate and investment horizon in years.
4
Review the projected future balance, total interest earned, and year-by-year table.
What This Tool Does
Iterates compounding periods using the standard formula A = P(1 + r/n)^(nt) combined with ongoing periodic annuities.
Common Use Cases
Planning retirement savings in 401(k), IRA, or index fund accounts.
Visualizing the power of early investing and consistent monthly contributions.
Forecasting college savings and long-term wealth building.
Privacy & Local-First Processing
All calculations run in client-side memory. Zero financial inputs are transmitted.
Frequently Asked Questions
How often should interest compound?
Most index funds and savings accounts compound monthly or daily. You can select your preferred frequency in the calculator.