Compound interest calculator
Estimate how money grows with monthly contributions and compounding interest.
Project savings month by month for any annual rate.
How to use this tool
- Enter the initial balance.
- Set the monthly contribution.
- Type the annual rate as a percent.
- Pick the duration in months and read the projection.
Typical use cases
- Planning a 12-month savings goal.
- Comparing two investment scenarios.
Limits & caveats
- Does not deduct fees or taxes.
- Educational only; not financial advice.
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This calculator compounds your balance monthly using an annual rate, then adds your contribution at the end of every month. Helpful for emergency fund planning, education savings and back-of-envelope investment math.