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Free Compound Interest Calculator - Fast Browser Tool

Estimate future investment value, recurring contribution growth, and effective annual return with accurate projections, responsive charts, and downloadable schedules.

Calculate Investment Growth See how it works
Accurate compounding Monthly contributions Growth visualization CSV schedule export
Estimated future balance
$0.00
Projection after 10 years
Total deposited $0.00
Interest / growth $0.00
Effective annual rate 0.00%
Growth on deposits 0.00%
Monthly deposits 0
Equivalent monthly rate 0.000%

Balance growth

Projected deposits and investment balance chart.

Projected deposits and balance over time.

Balance breakdown

0% Growth
Total deposited $0.00
Compound growth $0.00
View detailed projection schedule
Showing yearly totals
Compound interest projection schedule
Period Opening Contribution Interest Closing Deposited Growth
01
Private calculation Values remain in your browser
02
Accurate frequency model Annual through daily compounding
03
Detailed projections Monthly and yearly schedules
04
Flexible export Copy, print, or download CSV
Compound growth explained

Small returns can become meaningful over time

Compound interest is growth calculated on both the original principal and previously accumulated interest. Each period can therefore build upon the value created in earlier periods.

Time has an important effect on compound growth. Extending an investment period gives accumulated interest more opportunities to earn additional returns, producing a curved rather than purely linear growth path.

Recurring contributions create another growth engine

Regular monthly deposits increase the amount available to compound. A beginning-of-month contribution receives that month's growth, while an end-of-month contribution begins earning growth during the following month.

Nominal rate and effective annual rate

This calculator treats the entered value as a nominal annual rate. The effective annual rate reflects the selected compounding frequency and shows the annualized result before fees, taxes, and inflation.

Complete growth planning

Everything needed for a useful projection

Compare assumptions, understand the result, and export the details without complicated financial software.

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Five compounding frequencies

Compare annual, semiannual, quarterly, monthly, and daily compounding.

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Recurring contributions

Model monthly deposits at the beginning or end of every month.

↘

Negative-rate support

Estimate depreciation and losses in addition to zero or positive growth.

⌁

Responsive growth chart

Compare cumulative deposits with the projected balance throughout the term.

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Detailed schedule

Review opening balance, contributions, interest, and closing balance.

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Useful export options

Copy a summary, print the results, or download the complete monthly CSV.

Three simple steps

How to calculate compound interest

Build and compare a complete investment projection in less than a minute.

01
Step 1

Enter your investment

Add an initial principal, a monthly contribution, or both.

02
Step 2

Choose your assumptions

Set the rate, duration, frequency, and contribution timing.

03
Step 3

Review and export

Inspect the chart and schedule, then copy, print, or export it.

Compounding reference

How often is interest compounded?

At the same positive nominal rate, more frequent compounding generally produces a slightly higher effective annual return.

Frequency Periods per year Periodic nominal rate Common example
Annually 1 Annual rate ÷ 1 Simple annual projections
Semiannually 2 Annual rate ÷ 2 Some bonds and deposits
Quarterly 4 Annual rate ÷ 4 Quarterly-return products
Monthly 12 Annual rate ÷ 12 Savings and recurring plans
Daily 365 Annual rate ÷ 365 Daily-accrual accounts
Use realistic assumptions. A constant projection rate does not guarantee future returns. Market volatility, fees, taxes, inflation, withdrawals, and changing contribution amounts can materially affect results.
Common questions

Compound interest calculator FAQ

What is compound interest?

Compound interest is growth calculated on the original principal and on interest accumulated during earlier periods. This creates interest on interest and can accelerate long-term growth.

How is compounding frequency used?

The calculator treats the entered rate as a nominal annual rate and applies the selected annual, semiannual, quarterly, monthly, or daily frequency. More frequent compounding normally produces a slightly higher effective annual rate when the nominal rate is positive.

When are recurring contributions added?

You can place each monthly contribution at the beginning or end of the month. Beginning contributions receive that month of growth, while end contributions begin earning growth in the following month.

Can I use a zero or negative interest rate?

Yes. A zero rate shows growth from deposits only, while a negative rate can model depreciation or investment losses. The calculator accepts nominal annual rates from negative 99 percent through 100 percent.

Why might actual investment results differ?

Actual returns can change over time and may be affected by market volatility, contribution dates, fees, taxes, withdrawals, and rounding. This calculator uses a constant rate for an illustrative projection.

Does the calculator include taxes, fees, or inflation?

No. The projection does not automatically deduct taxes or fees and does not adjust the displayed future value for inflation. You can enter a lower estimated rate to approximate some of these effects.

Is this calculator financial advice?

No. The results are educational estimates based on the values you enter and are not financial, investment, tax, or legal advice.

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Turn your financial goal into a clear projection

Adjust the investment duration, return, and recurring contribution to see how small changes may affect long-term growth.

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