CD Calculator
Optimize your low-risk investments by calculating the true yield of your savings.
CD Calculator
Certificates of Deposit (CDs) offer a guaranteed return for locking your money away for a set period. This calculator shows exactly how much your CD will be worth at maturity — and compares it to leaving funds in a regular savings account.
What Is a CD?
A Certificate of Deposit is a savings product offered by banks and credit unions that pays a fixed interest rate in exchange for leaving a lump sum on deposit for a specified term (3 months to 5+ years). CDs are FDIC-insured up to $250,000 per depositor.
How to Use This Calculator
- Enter the deposit amount (initial principal).
- Enter the APY (Annual Percentage Yield) offered by the bank.
- Enter the term in months or years.
- Click Calculate to see interest earned and final value at maturity.
CD Calculation Formula
CDs compound interest (typically daily or monthly). The maturity value is:
A = P × (1 + APY)^t where t = term in years
Example Calculation
Deposit: $25,000 | APY: 5.2% | Term: 12 months
- Interest earned: $25,000 × 5.2% = $1,300
- Maturity value: $26,300
Same deposit in a 0.5% regular savings account: only $125 earned. The CD earns $1,175 more.
CD Laddering Strategy
Instead of one large CD, split into multiple CDs maturing at different times (e.g., 3-month, 6-month, 12-month, 18-month). This gives you regular access to funds without locking everything in one term, while still earning higher rates than a savings account.
Common Mistakes to Avoid
- Not comparing APY vs. APR — Always compare CDs using APY, which accounts for compounding frequency.
- Ignoring early withdrawal penalties — Breaking a CD early typically costs 1–12 months of interest depending on the term and bank.
- Keeping too much in CDs during rising rate environments — Short-term CDs (3–6 months) let you reinvest at higher rates if rates are rising.
- Exceeding FDIC insurance limits — Spread across multiple institutions if your deposits exceed $250,000 per bank.
Frequently Asked Questions
What is the best CD term right now?
In 2025, 12-month CDs often offer the best rates. In a rate-cutting environment, longer terms lock in today's higher rates. In a rising rate environment, shorter terms give flexibility to reinvest.
Can I add money to a CD after opening?
Standard CDs don't allow additional deposits after opening. Bump-up CDs and add-on CDs are variants that allow more flexibility, though often at slightly lower rates.
Are CDs worth it compared to a high-yield savings account?
CDs typically pay slightly more than HYSAs in exchange for locking your money. If you won't need the funds for the CD's term, the extra 0.25%–0.75% is worth it. See our Savings Calculator to compare.
What happens to my CD at maturity?
Most CDs automatically renew at the current rate unless you instruct the bank otherwise. Set a reminder — post-maturity, you have a short window to withdraw or change terms without penalty.
Conclusion
CDs are ideal for money you won't need for a set period and want to grow with zero risk. Compare current CD rates, calculate your exact earnings here, and consider laddering to balance access and returns.
Related: Savings Calculator | Compound Interest Calculator | Investment Calculator | Interest Rate Calculator
Tax Reminder
Interest earned on CDs is generally considered taxable income for the year it was earned, even if it stays in the CD. You'll receive a Form 1099-INT from your bank annually.
