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Compound Interest
See how a lump sum grows with compound interest at any compounding frequency.
Compound interest growth
Final balance: —
Interest earned: —
Effective annual rate: —
Total growth: —
How to use the Compound Interest
- Enter the starting amount, the annual rate and the number of years.
- Choose how often the interest is compounded.
- The final balance, interest earned and year by year growth appear instantly.
Features
- Six compounding frequencies including continuous
- Final balance and interest earned
- Effective annual rate
- Year by year growth breakdown
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Frequently Asked Questions
Common questions about the free online compound interest.
Compound interest is interest that earns interest. Each period the interest is added to the
balance, so later interest is calculated on a larger.
The more often interest is compounded, the faster the balance grows, because interest is
added to the balance more frequently.
Continuous compounding applies interest constantly rather than at set intervals, and uses the
mathematical constant e in the formula.
It is the real growth rate over one year once compounding is taken into account, which is why
it is higher than the nominal rate.
The balance is the starting amount multiplied by one plus the rate divided by the frequency,
raised to the frequency times the number of years.
Yes. Enter the starting balance, the interest rate and the term to see what an account could
be worth.
No. It shows the nominal balance, so subtract tax and consider inflation separately if you
want a real return.
No. Only a single lump sum is grown, so add monthly contributions separately if you save on a
schedule.
No, all figures are calculated locally in your browser.
Last updated: October 10, 2026