Estimate how savings and investments can grow over time with compound interest.
See how your contributions and investment balance grow over time.
| Year | Contributions | Interest Earned | Balance |
|---|---|---|---|
| Calculate your investment to see the growth schedule. | |||
The Numelios Compound Interest Calculator helps estimate how money may grow over time when interest is added to both the original principal and previously earned interest.
Use it to explore how starting balance, contribution amount, interest rate, compounding frequency, and time horizon can affect future value.
Compound interest means that interest can be earned on both the original amount and on interest that has already been added.
In this formula, A is the future value, P is the principal, r is the annual interest rate, n is the number of compounding periods per year, and t is time in years.
Suppose you invest $10,000 at an annual rate of 6% for 10 years.
The future value depends on the rate, compounding frequency, time period, and whether additional contributions are made.
Simple interest is calculated only on the original principal. Compound interest can also include interest previously earned, which can accelerate growth over longer periods.
Use the Interest Calculator to compare different interest calculations.
A larger initial amount provides a larger base on which future interest can accumulate.
Higher rates generally produce faster growth when other assumptions remain unchanged.
Longer time horizons allow more compounding periods and can significantly affect future value.
Regular contributions can increase the amount available to earn future returns.
Interest may be compounded annually, semiannually, quarterly, monthly, daily, or according to another schedule. More frequent compounding can produce a slightly higher future value when the stated annual rate is unchanged.
Compound growth can be useful when estimating long-term savings goals. The Savings Calculator can help explore recurring contributions and future savings balances.
For broader investment scenarios, use the Investment Calculator to compare starting capital, contributions, expected return, and time.
Compound interest is interest calculated on the principal plus previously accumulated interest.
It can. When the nominal annual rate is unchanged, more frequent compounding may produce a slightly higher effective return.
More time allows additional compounding periods, which means previously earned interest has more opportunities to generate additional growth.
If the calculator includes contribution inputs, recurring deposits can be added to estimate how continued saving affects future value.
No. Calculator results are projections based on the rate entered. Actual investment returns can vary and may be negative.
This calculator is provided for informational and educational purposes only. Results are estimates based on the values entered and do not constitute investment, tax, or financial advice. Actual returns are not guaranteed.