ProfitMetricLabHow to use this calculator
- Enter the initial deposit and a whole number of growth years.
- Adjust the example nominal rate; it is not a bank offer.
- Choose the compounding frequency for your scenario.
- Try monthly, annual or no contributions. The amount is per contribution.
- Compare the balance, money deposited and interest. Every valid change refreshes the result.
Check whether a financial product quotes a nominal rate or an effective annual yield (APY). This tool takes a nominal rate; APY already includes the effect of compounding.
How it works
Balance = P × e^(g×t) + C × [e^(g×t) − 1] ÷ [e^(g/k) − 1]; g = m × ln(1 + r/m). At zero interest: P + C × k × t.
With a $10,000 deposit, 1 year, a 4% nominal annual rate, daily compounding and no contributions, the estimated balance is $10,408.08: $408.08 interest. If 4% were an effective annual yield (APY), the balance would be $10,400 instead; these rates are not interchangeable.
What the result means
Compound interest adds growth to your starting money and the interest already earned. Contributions increase the amount that can grow, and timing matters: this tool places deposits at the end of each month or year. The chart separates deposited money from interest; the table provides the same figures without relying on color.
Assumptions & limits
Common questions
Are my inputs saved?
We do not store or submit form inputs. Reloading restores the example values.
Is the result exact?
The display rounds to at most two decimal places; intermediate values retain their precision. Assumptions may differ from your actual situation.