5 years
Short time horizon where contributions often dominate the final value.
Long-term compounding
Compound Interest Calculator
Estimate how compounding can affect long-term growth. Enter a starting amount, regular contribution, expected return and time horizon.
Why time matters
Compounding needs time. Over short periods, contributions may be the main driver of growth. Over longer periods, the growth component can become more significant.
Total contributed
Estimated final value
Estimated growth
Growth from compounding
Important assumption
For informational purposes only — not financial advice. Disclaimer
Growth over time
Total investedEstimated value
10 years
Useful for comparing realistic savings-plan horizons.
20 years
The compounding effect usually becomes more visible here.
30 years
Long-term assumptions can produce very large differences.
Educational use only
This calculator is a simplified educational simulation. It is not financial advice and does not guarantee future returns.
What is compound interest?
Compound interest is when the interest earned on an investment is reinvested, so that future interest is calculated on a larger amount. Over time this can produce significant growth.
What annual return should I enter?
Common benchmarks for diversified stock portfolios range from 5 to 7 percent annually after fees. Actual returns vary and are not guaranteed.
Does the calculator include taxes or inflation?
No. Results are shown before taxes and are not adjusted for inflation. Use them for comparison and planning purposes only.