CD Calculator
A certificate of deposit (CD) is a FDIC-insured savings account that pays a guaranteed interest rate if you keep your money deposited for a fixed term. CDs typically pay more than savings accounts in exchange for locking up funds — this calculator shows exactly what you'll earn.
Enter your deposit amount, APY, term, and compounding frequency to see your total interest earned, final balance at maturity, and a year-by-year breakdown.
| Period | Balance | Interest Earned |
|---|
How CDs Work — Rates, Terms, and Compounding
A certificate of deposit is one of the safest ways to earn guaranteed interest on cash you don't need immediately. Banks and credit unions compete on CD rates, especially for terms of 6 months to 5 years, and FDIC/NCUA insurance protects deposits up to $250,000 per institution. Unlike a savings account, where the rate can change monthly, a CD locks in the rate for the entire term — which is valuable when rates are high and expected to fall.
The tradeoff is liquidity. Withdrawing before maturity typically triggers an early withdrawal penalty of 60 to 180 days of interest depending on the bank and term length. For a $10,000 CD at 4.5% with a 180-day penalty, breaking the CD early could cost $220 in forfeited interest. Always confirm the early withdrawal penalty before opening a CD with money that might be needed.
APY vs. APR — What Banks Actually Advertise
Banks are required by the Truth in Savings Act to advertise APY (Annual Percentage Yield), not APR. APY accounts for the effect of compounding — it's the effective annual return you actually earn. APR is the nominal rate before compounding is applied. If a CD has a 4.37% APR compounding monthly, the APY is 4.46%. This calculator uses APY directly, which means you get an accurate return without needing to convert rates.
| Term | APY | Interest Earned | Final Balance |
|---|---|---|---|
| 6 months | 4.75% | $237 | $10,237 |
| 1 year | 4.50% | $450 | $10,450 |
| 2 years | 4.25% | $869 | $10,869 |
| 3 years | 4.00% | $1,249 | $11,249 |
| 5 years | 3.90% | $2,108 | $12,108 |
CD Laddering: Liquidity Without Sacrificing Rate
A CD ladder splits your savings into multiple CDs with staggered maturities — for example, five $5,000 CDs maturing in 1, 2, 3, 4, and 5 years. Each time one matures, you reinvest in a new 5-year CD. This strategy captures long-term rates while maintaining yearly access to a portion of your funds. Laddering is especially effective when the yield curve is normal (longer terms pay more) and you want a predictable liquidity schedule. Use this calculator on each rung of your ladder to see the total interest across all CDs.
When to Choose a CD Over a High-Yield Savings Account
High-yield savings accounts (HYSAs) offer flexibility — no penalties, variable rates that track the Fed funds rate. CDs lock in a fixed rate but can outperform HYSAs when rates are falling. If the Fed has raised rates and is expected to cut, locking a CD now secures today's higher rate. If rates are rising, a HYSA or a shorter-term CD keeps you flexible to move to higher rates sooner. The right choice depends on where rates are headed relative to your timeline.
If you want to compare a CD against keeping your money in a savings account or investing it, the Compound Interest Calculator lets you model any interest rate and compounding frequency. For building a savings goal with a fixed timeline, the Savings Goal Calculator shows how a CD deposit fits into your plan.
Frequently Asked Questions
What is a certificate of deposit (CD)?
A CD is an FDIC-insured savings product where you deposit a fixed amount for a set term (typically 3 months to 5 years) at a guaranteed interest rate. In exchange for committing your money for the term, you earn a higher rate than a regular savings account. Withdrawing before maturity triggers an early withdrawal penalty — typically 60 to 180 days of interest.
What is APY and why does it matter?
APY (Annual Percentage Yield) is the effective annual return including compounding. Banks are required to advertise APY for CDs. When comparing CDs, always compare APY — not APR — because APY accounts for how often interest compounds and gives you the true return. This calculator uses APY directly for accurate results.
How does compounding frequency affect my earnings?
More frequent compounding (daily vs. annually) earns slightly more because interest starts earning interest sooner. However, since banks advertise APY which already accounts for compounding, the practical difference between daily and monthly compounding on the same APY is extremely small — often just a few cents on a multi-year CD.
What is a CD ladder and why use one?
A CD ladder splits your savings into multiple CDs with different maturities (e.g., 1, 2, 3, 4, 5 years). As each CD matures, you reinvest in a new long-term CD. This lets you earn higher long-term rates while maintaining annual liquidity. Laddering also protects against reinvestment risk — if rates fall, only a portion of your savings needs to be reinvested at the lower rate.
When is a CD better than a high-yield savings account?
A CD is better when you won't need the money during the term and want a guaranteed fixed rate — especially useful when interest rates are expected to fall. A high-yield savings account is better when you need flexibility or believe rates will rise. Many people use both: a HYSA for their emergency fund and CDs for longer-term cash they won't need for 1–5 years.
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