Compound Interest Calculator
Calculate the future growth of your savings and investments. Compare compounding frequencies and view yearly breakdowns.
Calculate potential future value of your savings offline
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Year-by-Year Growth Table
| Year | Deposits (Principal) | Compound Interest | Total Balance |
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How to use this tool
Why Compounding Matters
Compounding is the mathematical engine of wealth. It adds interest back into your principal, meaning you earn interest on interest. Over long periods, this creates an exponential growth curve that works entirely in your favor.
How to Calculate Your Growth
Follow these simple configurations to model your compound interest projections in real time.
Initial Principal
Input your starting capital. Even small starting amounts grow substantially over 10 to 20 years thanks to time in the market.
Monthly deposits
Add recurring monthly contributions. Consistency accelerates the compounding cycle and boosts your returns.
Compounding & Rates
Select interest rates and frequency. More frequent intervals (e.g. Monthly vs Annually) compound faster.
The Compounding Model Formula
The future value of your portfolio is calculated using the standard compound interest formula with regular annuity deposits:
A = P(1 + r/n)nt + PMT × [((1 + r/n)nt - 1) / (r/n)]
Frequently Asked Questions
Quick answers to common questions about usage parameters, privacy, and speed.
Does the compounding interval make a big difference?
Yes! The more frequently interest is compounded (added back to your principal), the faster your balance grows. For example, monthly compounding produces slightly higher returns than annual compounding at the same interest rate because your interest starts earning interest sooner.
Is this calculation secure?
Absolutely. 100% of the mathematical compounding engine runs locally inside your web browser. We do not transmit your financial inputs, interest rates, or calculations to any external servers.
Privacy & Safety Policy
All tools run completely in your browser via client-side JavaScript. We do not upload your files, interest parameters, or JSON payloads to any server. Your data remains yours.