What is compound interest?

Compound interest is interest earned on both your original money and on the interest already added. Over time this makes balances grow faster than simple interest.

How does compounding frequency change the result?

The more often interest compounds (daily rather than annually), the slightly more you earn, because interest starts earning interest sooner. The effect is small at low rates and grows with higher rates and longer periods.

How are monthly contributions handled?

Contributions are added at the end of each month and then earn interest from the following month onward.

Is this financial advice?

No. It shows a mathematical projection at a fixed rate. Real returns vary, and taxes and fees are not included.

Compound Interest Calculator

Project how your savings or investments can grow over time with compound interest, including regular monthly contributions and your choice of compounding frequency.

Free
No signup
Private

Initial amount

Monthly contribution (optional)

Annual interest rate (%)

Time (years)

Compounding frequency

—

Overview

Project how your savings or investments can grow over time with compound interest, including regular monthly contributions and your choice of compounding frequency.

Benefits

Optional monthly contributions
Annual to daily compounding
Year-by-year growth table
Runs privately in your browser

Use Cases

Planning long-term savings or retirement goals
Comparing different interest rates
Seeing the power of starting early
Estimating the value of a recurring deposit

Users Also Use

How to Use

Enter your initial amount and, optionally, a monthly contribution.
Enter the annual interest rate, the number of years, and how often interest compounds.
Click Calculate to see the future value, total interest earned, and growth year by year.

FAQ

What is compound interest?: Compound interest is interest earned on both your original money and on the interest already added. Over time this makes balances grow faster than simple interest.
How does compounding frequency change the result?: The more often interest compounds (daily rather than annually), the slightly more you earn, because interest starts earning interest sooner. The effect is small at low rates and grows with higher rates and longer periods.
How are monthly contributions handled?: Contributions are added at the end of each month and then earn interest from the following month onward.
Is this financial advice?: No. It shows a mathematical projection at a fixed rate. Real returns vary, and taxes and fees are not included.

About Compound Interest Calculator

Use our Compound Interest Calculator to project how a lump sum or a regular monthly saving habit could grow. Choose annual, semi-annual, quarterly, monthly, or daily compounding and review a year-by-year table of contributions, interest earned, and balance.