See exactly how your money grows over time. Enter your starting amount, monthly contribution, and interest rate — and watch compound interest do the heavy lifting.
Compound Growth Calculator
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| Year | End Balance | Annual Contribution | Interest This Year | Growth % | Total Contributed | Total Interest |
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How to Use the Savings & Investment Calculator
- Initial Amount — How much you’re starting with today. Even $0 works — start where you are, not where you wish you were.
- Monthly Contribution — What you’ll add each month. Start small and increase it over time as your income grows.
- Annual Interest Rate — Use a realistic number. High-yield savings accounts: 4–5%. Index funds: 7–10% historical average. CDs: 4–5%.
- Years to Grow — The longer the better. Time is your most powerful asset in any savings or investment plan.
- Compounds / Year — Leave it at Monthly for most scenarios. More frequent compounding = slightly more growth.
- Contribution Frequency — Match this to how often you actually plan to contribute.
- Hit Calculate — Your future value, total contributed, and total growth appear instantly.
Pro tip: Try bumping your monthly contribution by just $50 and watch how dramatically the result changes over 20–30 years. That’s the power of a savings and investment calculator, small tweaks, massive long-term impact.
What Is Compound Interest and Why Does It Matter?
Compound interest means you earn interest on your interest — not just your original deposit. Over time this creates exponential growth, which is why starting early matters more than starting big.
A $250/month habit at 7% annual return for 30 years doesn’t grow to $90,000. It grows to over $283,000. The extra $193,000 is pure compound interest — money your money made without you lifting a finger.
Run the numbers above and see what your money could become.
Savings vs Investing — What Rate Should You Use?
Not sure what interest rate to enter? Here’s a quick guide:
- High-yield savings account — 4.5–5.5% (as of 2026)
- CDs (Certificates of Deposit) — 4–5%
- Bonds — 3–5% depending on term and type
- S&P 500 index funds — 7–10% historical average (not guaranteed)
- Real estate — 8–12% average annual return (varies widely)
The savings and investment calculator works for any scenario, just plug in the rate that matches your strategy.