Free Compound Interest Calculator: enter your deposit, monthly contribution, rate and time to see your future value, total interest and a year-by-year growth chart. Want to see how much your savings or investments could grow? Our free Compound Interest Calculator shows the power of compounding in seconds. Enter your starting amount, regular contributions, annual interest rate and time period, then choose how often interest compounds, from daily to yearly. You’ll instantly see your future value, total deposits, total interest earned, the effective annual rate, an optional inflation-adjusted value, a growth chart and a year-by-year table you can download as CSV. It’s ideal for savings accounts, fixed deposits, retirement planning and long-term investing, and everything runs in your browser, so nothing you enter is stored.
Enter an initial deposit or a regular contribution to see your growth.
- Total deposits
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- Total interest earned
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- Interest share of balance
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- Effective annual rate (EAR)
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- Value in today's money
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Growth Over Time
Growth Schedule
| Year | Total Deposits | Interest | Total Interest | Balance |
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Results are estimates based on a fixed rate and regular contributions. Real returns vary, and fees or taxes may reduce them. This is not financial advice.
How to Use the Compound Interest Calculator
- Enter your initial deposit (starting balance).
- Enter the amount you plan to add regularly and choose whether it is added monthly or yearly, at the start or end of each period.
- Enter the annual interest rate (% per year).
- Set the time period in years and months.
- Choose how often interest compounds (daily, weekly, monthly, quarterly, semi-annually or yearly).
- Optionally enter an expected inflation rate to see the value in today’s money.
- Pick your currency.
- Read your future value, total deposits and total interest, check the growth chart, and open the yearly or monthly table.
- Click Download CSV to save the schedule, or Reset to start over.
FAQs
- What is compound interest? Compound interest is interest earned on both your original money and on the interest already added. Over time this makes savings grow faster than simple interest.
- What is the compound interest formula? For a single deposit, A = P × (1 + r ÷ n)^(n × t), where P is the principal, r is the annual rate (as a decimal), n is the number of compounding periods per year and t is the number of years. This calculator also handles regular contributions.
- Does compounding more often earn more? Yes, slightly. Daily compounding earns a little more than yearly at the same stated rate. The effective annual rate (EAR) shown by the calculator reflects this.
- Why does starting early matter so much? Interest earns interest, so the longer your money stays invested, the more the growth accelerates. Even small regular contributions can grow into a large balance over decades.
- What does the inflation option show? It shows what your future balance would be worth in today’s money if prices rise at the rate you enter, which gives a more realistic view of purchasing power.
- Are the results guaranteed? No. This tool assumes a fixed rate and regular contributions. Real returns vary, and fees or taxes can reduce them, so treat results as estimates and speak to a financial advisor for personal advice.
