Compound Interest Calculator — Free Daily, Monthly & Annual Investment Growth Tool

Compound Interest Calculator — Free Daily, Monthly & Annual Investment Growth Tool. Free compound interest calculator with monthly or annual contributions.

Choose daily, monthly, quarterly, annual or continuous compounding and see future value, interest earned, APY, inflation-adjusted value and a year-by-year table.

This free compound interest calculator shows how an initial deposit plus regular contributions grows over time.

Enter your starting balance, a monthly or yearly contribution, the annual interest rate and the number of years, then choose how often interest compounds — daily, weekly, monthly, quarterly, semi-annually, annually or continuously.

You instantly get the future value, total contributions, total interest earned and a year-by-year schedule, so it works as a monthly compound interest calculator, a daily compound interest calculator and a savings calculator in one.

Under the hood it applies the compound interest formula A = P(1 + r/n)^(nt) (or A = Pe^(rt) for continuous compounding) month by month and adds each deposit at the start or end of the period you select — deposits at the start earn one extra period of interest.

The results also show the effective annual rate (APY) for your compounding frequency and the exact time it takes money to double, which is more precise than the rule of 72.

Add an expected inflation rate to see the inflation-adjusted balance in today's money, and pick your currency (USD, EUR, GBP, INR, PKR, SAR and more).

Use the investment growth calculator to compare savings accounts, certificates of deposit, index funds or retirement plans, download the yearly schedule as CSV for Excel or Google Sheets, or share a link that restores all your inputs.

All calculations run privately in your browser — nothing is sent to a server. Results are estimates that assume a constant rate and no taxes or fees.

For loans try the Mortgage Calculator; for quick percentages and growth rates use the Percentage Calculator, and to count exact days between deposits use Days Between Dates.

Frequently asked questions

How do I use this compound interest calculator?

Enter the Initial Deposit, your Monthly Contribution (or Annual Contribution), the Annual interest rate (%) and the Number of Years, then choose the Compounding frequency and Deposit timing. The Final Balance, Total Contributions, Interest Earned and a year-by-year growth table update as you type.

What is the difference between daily, monthly and annual compounding?

Compounding frequency is how often interest is added to the balance. You can choose daily, weekly, monthly, quarterly, semi-annual, annual or continuous compounding. More frequent compounding gives a slightly higher effective annual rate, shown in the Effective annual rate (APY) card.

Does it matter if I deposit at the start or end of each period?

Yes. With Start of period, each deposit is added before that period's interest, so it earns one extra period of interest. End of period (the default) adds deposits after interest, which matches most savings plans. Switch Contribution frequency between Monthly and Annually to match how you save.

What does the inflation-adjusted balance mean?

If you enter an Expected inflation rate (%) above 0, the final balance is divided by the cumulative inflation over the period to estimate its value in today's money. Leave inflation at 0 to hide this card.

How is the time to double calculated?

Time to double uses the exact formula ln(2) divided by ln(1 + effective annual rate) instead of the rule of 72. It describes a single lump sum growing at that rate, without further deposits.

Is this calculator financial advice?

No. It is an educational estimate that assumes a constant interest rate and ignores taxes, fees and market ups and downs, so real results will differ. You can download the yearly schedule as CSV for your own planning, but talk to a licensed financial adviser before making investment decisions.

How to use this online tool

Compound Interest Calculator — Free Daily, Monthly & Annual Investment Growth Tool is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

Compound Interest Calculator — Free Daily, Monthly & Annual Investment Growth Tool keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use Compound Interest Calculator — Free Daily, Monthly & Annual Investment Growth Tool for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.