Compound interest calculator
Project the growth of an investment with regular contributions.
Final balance—
Total contributions—
Interest earned—
The power of compound interest
Compound interest earns returns on your previous returns. With regular contributions and time, growth accelerates. The calculator simulates monthly contributions and the compounding frequency you choose, and shows the balance year by year.
Frequently asked questions
What is the compound interest formula?
A = P × (1 + r/n)^(n×t), plus the future value of any regular contributions.
How often should interest compound?
The more frequently interest compounds, the higher the final balance — although the difference between monthly and daily compounding is small.
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