FINANCE TOOL
Compound Interest Calculator
See how savings or investments grow with compound interest over time.
Final balance
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Total contributed
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Interest earned
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Hover the chart to read the balance at a given year. The dashed line is total contributed (no interest); the gap to the solid line is interest earned.
About this tool
See how a starting amount grows over time when interest compounds, with an optional regular monthly contribution added along the way. Compare monthly, quarterly, annual, or daily compounding to see how the frequency affects the final balance.
This is an estimate for planning purposes and assumes a constant rate of return — real investments fluctuate and this isn't financial advice.
Frequently asked questions
- What formula is used?
- Compound interest on the starting amount, plus a future-value-of-annuity calculation for the recurring monthly contributions, both using the selected compounding frequency.
- Does compounding frequency make a big difference?
- For most everyday rates the difference between monthly and daily compounding is small, but it grows with higher rates and longer time periods.
- What if I don't add monthly contributions?
- Leave that field at 0 (or empty) to see pure compound growth on the starting amount alone.