Simple vs. Compound Interest
See how compounding changes an initial deposit over time.
Open calculator →Compare two plans with different rates, deposits, and timeframes.
Change a number. Your estimate updates automatically.
Both plans use monthly compounding and end-of-month deposits. Rates are nominal annual assumptions.
Constant-rate illustration. Taxes and fees are excluded. Returns can vary or be negative; this is not a guaranteed outcome.
Both plans use monthly compounding and end-of-month deposits. Different timeframes produce different endpoints; the tool labels them rather than extending a finished plan.
For example, compare a higher monthly deposit at a lower rate with a smaller deposit at a higher rate. Compare equal timeframes when you want a direct endpoint comparison.
This is a mathematical projection using the inputs shown. It excludes taxes, fees, and changes in rates.
Yes. Download the projection as CSV or print the result. Changing an input recalculates the output.
Explore related calculations with the same clear inputs and detailed results.
See how compounding changes an initial deposit over time.
Open calculator →Convert a nominal annual rate into an effective annual yield.
Open calculator →Project your savings at retirement using your current balance and regular contributions.
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