Compound Interest & Savings Calculator
See how your savings grow over time with compound interest and optional monthly contributions.
Savings & interest inputs
How much you add each month.
This calculator assumes monthly contributions and monthly compounding using a constant average annual return. Real investments can go up and down and may include fees or taxes.
Results
Use this as a rough guide for long‑term savings and investment planning, not a guarantee of future performance.
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Frequently Asked Questions
What does this compound interest calculator show?
It shows your final balance, total contributions, and total interest earned based on your starting amount, monthly contributions, interest rate, and time horizon.
Is this suitable for both personal savings and simple investments?
Yes. It is designed for general savings and basic investment planning, but it does not model market risk, taxes, or fees.
Compound Interest: Why Starting Early Matters
Compound interest means you earn interest not only on your original savings, but also on the interest that has already been added. Over time, this snowball effect can make a big difference — especially when you contribute regularly.
This calculator is designed for everyday savers and simple long‑term investments like index funds or retirement accounts. It won't predict markets, but it helps you understand the power of time and consistency.
Example: Saving a Little Each Month
If you start with $5,000, add $200 per month, and earn an average of 5% per year for 10 years, you'll contribute $29,000 in total. With compound interest, your final balance could be noticeably higher than the amount you put in.
Practical Tips
To grow faster
- • Start as early as you can, even with small amounts
- • Increase your monthly contribution when your income grows
- • Let interest compound for as long as possible
Remember
- • Real returns can vary from year to year
- • Fees and taxes reduce your actual growth
- • Higher returns usually come with higher risk
This calculator is a simplified projection and should not be treated as investment advice. Always consider your risk tolerance and consult a qualified professional for detailed planning.