CD Calculator
Calculate the final balance and interest earned on a Certificate of Deposit. Enter your initial deposit, APY, and term to see total returns and an early withdrawal penalty estimate.
Formulas, assumptions, and rounding are documented in our calculator methodology.
Final CD Balance
$10,500
after 12 months at 5% APY
CD Summary
- Final Balance
- $10,500.00
- Initial Deposit
- $10,000.00
- Interest Earned
- $500.00
- Total Return
- 5.0000%
- Term
- 12 months (1.00 yrs)
- APY
- 5%
Deposit vs. Interest
Early Withdrawal Penalty Estimates
Penalty amounts vary by bank and CD type. Check your CD agreement before withdrawing early.
This calculator uses APY (effective annual yield) with annual compounding. Some CDs compound daily or monthly, which results in slightly different final balances. CD rates and early withdrawal penalties vary by financial institution. FDIC insurance covers deposits up to $250,000 per depositor per bank for qualifying account types. This calculator is for comparison and educational purposes only — not a deposit agreement or guarantee.
CD Calculation Formula
For a simple annual APY model: Final balance = Principal × (1 + APY)^years. Interest earned = Final balance − Principal. Total return % = (Interest ÷ Principal) × 100. Example: $25,000 at 4.5% APY for 2 years → $25,000 × (1.045)^2 = $27,303.06. Interest earned: $2,303.06. Return: 9.21%.
CD vs. High-Yield Savings Account
CDs offer fixed rates for a defined term — ideal when rates are high and you want to lock in a yield. HYSAs offer variable rates but full liquidity. Trade-off: CD locks in today's rate (good if rates fall), but you pay a penalty for early withdrawal. HYSA rate adjusts with the market (bad if rates fall, good if they rise). Most financial planners suggest keeping your emergency fund in a HYSA and using CDs for savings you won't need for a defined period.
CD Laddering Example
Split $20,000 into five equal $4,000 CDs: 1-year, 2-year, 3-year, 4-year, and 5-year. Every year, the shortest CD matures — you reinvest at the 5-year rate. After 5 years, all CDs roll at the 5-year rate while one matures each year for liquidity. Benefit: you capture higher long-term rates while maintaining annual access to 20% of funds.
Frequently Asked Questions
- A Certificate of Deposit (CD) is a time deposit offered by banks and credit unions. You deposit a fixed amount for a set term (typically 3 months to 5 years) at a fixed APY. At maturity, you receive your principal plus interest. CDs are FDIC-insured up to $250,000 per depositor per bank, making them low-risk savings tools.
- Final balance = Principal × (1 + APY)^(term in years). Interest earned = Final balance − Principal. Example: $10,000 at 5% APY for 12 months → $10,000 × (1.05)^1 = $10,500. Interest earned = $500. For 6 months: $10,000 × (1.05)^0.5 = $10,247. Many CDs compound daily or monthly, which may result in slightly higher yields than the simple annual formula.
- Early withdrawal penalties vary by bank and CD term. Common penalties: 3 months of interest for CDs under 1 year; 6 months of interest for 1–2 year CDs; 12 months of interest for CDs over 3 years. Some no-penalty CDs allow early withdrawal without forfeiting interest. Always check your CD agreement before withdrawing early.
- A CD ladder splits your savings across multiple CDs with staggered maturities (e.g., 3-month, 6-month, 1-year, 2-year, 3-year). As each CD matures, you reinvest at the longest term. This gives you regular liquidity while capturing higher rates on longer terms and reduces the risk of locking all funds into a single rate environment.
- CD rates are primarily influenced by the Federal Reserve's target federal funds rate. When the Fed raises rates, CD rates typically rise; when the Fed cuts rates, new CD rates fall. Online banks and credit unions often offer higher rates than traditional banks due to lower overhead. Compare current rates across institutions — a difference of even 0.5% APY can meaningfully impact returns over a 1–5 year term.