Enter values and select Calculate to see your result.
Investment Growth
Estimate how an initial amount may grow when interest compounds over time.
View formula
A = P(1 + r/n)ⁿᵗ
How to use the Compound Interest Calculator
Project growth from a starting balance, monthly contribution, return and period using monthly compounding.
- Enter starting amount and contribution.
- Enter annual return and years.
- Calculate contributions and estimated growth.
Compound Interest Calculator formula
Balance combines monthly compounding with end-of-month contributions.
Worked example
Inputs: $10,000, no monthly contribution, 5% annual return for 10 years.
What to expect: Projected balance is about $16,470.09 before taxes and fees.
How to read your result
Compound growth accelerates over time, but returns fluctuate and are not guaranteed.
Frequently asked questions
What is compound interest?
It earns growth on the original balance plus previously credited interest.
Can I include deposits?
Yes. Enter the recurring monthly contribution.