Current CD Special
Earn 3.60% APY† with a 11-Month CD
See How Fast Your Savings Can Grow
Enter your starting balance, monthly contribution, interest rate, and investment time to estimate how your savings could grow with compounding interest.
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Future Value
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Disclaimer: This calculator provides estimates only and is not a guarantee of actual earnings. Results assume regular monthly contributions and consistent interest rates. Actual returns may vary. Please contact us for current rates and complete details.
FAQs to Help Grow Your Savings
Wondering what your numbers mean? These FAQs break down the results and the factors that drive growth.
How exactly does compound interest work to grow my savings?
Compound interest is often called "interest on interest." Unlike simple interest, which only calculates returns on your initial principal, compounding adds your earned interest back into your balance. This means in the next period, you earn interest on a larger amount.
The formula for compound interest is:
A = P ( 1 +
rn
)ntWhat is the difference between daily, monthly, and annual compounding?
The frequency of compounding determines how quickly your money grows. The more often interest is added to your account, the faster your balance increases.
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Daily Compounding: Interest is calculated and added every day (most common in high-yield savings accounts).
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Monthly Compounding: Interest is added 12 times a year.
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Annual Compounding: Interest is added once at the end of the year.
Pro Tip: Even if the interest rate is the same, an account that compounds daily will yield a slightly higher Annual Percentage Yield (APY) than one that compounds annually.
How much will $10,000 grow in 10 years with compound interest?
Your final balance depends on your interest rate and how often it compounds. For example, if you invest $10,000 at a 7% annual return compounded monthly:
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In 5 years: You’ll have approximately $14,176.
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In 10 years: You’ll have approximately $20,096.
Without adding a single extra penny, your money has doubled simply by letting time and compounding do the heavy lifting.
How do monthly contributions affect my total savings growth?
Regular contributions act as a massive accelerant for compound interest. While your initial deposit grows, each new monthly contribution starts its own compounding journey. Using a compound interest calculator with monthly additions shows that even small amounts, like $100 a month, can lead to six-figure differences in your long-term retirement fund compared to letting a lump sum sit idle.
Is compound interest better than simple interest for long-term investing?
Absolutely. Simple interest is linear, meaning your growth stays flat over time. Compound interest is exponential. If you are looking to build wealth for retirement or a long-term goal, compounding is the superior choice because it rewards patience. The longer you leave your money untouched, the more "work" the interest does for you.
Compound Interest Calculator Disclosures
†All rates are subject to change without notice. Interest bearing account – refer to FSB rate sheet for information on Interest Rates and Annual Percentage Yields. Fees may reduce earnings. FSB is not responsible for typographical errors or omissions. Minimum deposit of $1,000.00 required. Existing CD renewals not subject to the special rates at maturity unless specifically requested at maturity. Interest is compounded and paid quarterly. Fees may reduce earnings. Penalty for early withdraw may apply including loss of principal. For current rate information call 319-377-4891. Rate = Interest Rate
