Certificate of Deposit (CD) Calculator
Calculate your CD earnings, build a CD ladder for liquidity and yield, or compare CDs against savings accounts and the stock market.
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How to Use This Calculator
CD Earnings tab
A Certificate of Deposit (CD) is a time deposit that pays a fixed interest rate for a fixed term. Enter your deposit amount, APY, term, and compounding frequency. The calculator shows total interest earned, final balance, after-tax return, and early withdrawal penalty. Expand "More options" to set your tax bracket and penalty days.
CD Ladder Builder tab
Enter the total amount to invest and select 3-5 rungs. Each rung has an editable rate and amount. The calculator shows per-rung interest, blended yield, maturity timeline, and compares the ladder to a single long-term CD. Use "Split evenly" to distribute your money equally.
CD vs Alternatives tab
Compare a CD against a high-yield savings account and the stock market. See after-tax returns for each, risk levels, and liquidity. The calculator uses LTCG rates for stocks and ordinary income rates for CD and HYSA interest.
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The Formula
CDs use standard compound interest. Most banks compound daily:
Where:
FV = future value (what you get back)
P = principal (deposit amount)
r = annual interest rate (nominal)
n = compounding frequency (365 for daily, 12 for monthly)
t = time in years
APY = (1 + r/n)n − 1
APY accounts for compounding — it’s the actual annual return.
Early Withdrawal Penalty = (Rate ÷ 365) × Penalty Days × Principal
APY vs APR: Banks advertise APY because it’s higher than the nominal rate. A 4.50% APY with daily compounding means a nominal rate of about 4.40%. The calculator handles this conversion automatically.
Example
Margaret — Retired teacher, 67, Tucson AZ
Margaret has $50,000 to park safely. She’s in the 22% tax bracket and wants guaranteed returns with some liquidity. She compares three options:
Option 1: 1-year CD at 4.3% APY
Option 2: 5-year CD at 3.8% APY
Option 3: CD Ladder (5 × $10K)
Margaret chose the CD ladder. She earns less total interest than the 5-year CD, but a CD matures every 12 months — she always has access to some funds without penalty. If rates rise, she reinvests maturing CDs at the new higher rate.
FAQ
A CD is a time deposit at a bank or credit union. You deposit money for a fixed term (3 months to 5+ years) at a fixed interest rate. In exchange for locking up your money, the bank pays a higher rate than a regular savings account. CDs are FDIC insured up to $250,000 per depositor per bank, making them one of the safest investments available.
Most banks compound CD interest daily (365 times per year). Some compound monthly (12) or quarterly (4). More frequent compounding means slightly higher returns. The APY (Annual Percentage Yield) already accounts for compounding — a 4.50% APY is what you actually earn in one year, regardless of compounding frequency. The nominal rate (APR) is lower than the APY.
You pay an early withdrawal penalty, typically calculated as a number of days of simple interest: 90 days for short-term CDs (under 1 year), 180 days for 1-3 year CDs, and up to 365 days for 5+ year CDs. The penalty can eat into your principal if you withdraw very early. Good news: the penalty is tax-deductible. No-penalty CDs exist but offer lower rates. Brokered CDs (purchased through a brokerage) can be sold on the secondary market instead, but at market price.
A CD ladder splits your total investment across multiple CDs with staggered maturities (e.g., 1-year, 2-year, 3-year, 4-year, 5-year). Benefits: (1) Regular liquidity — a CD matures every year so you always have access to some funds. (2) Rate hedging — if rates rise, you reinvest maturing CDs at the new rate. (3) Higher average yield than short-term CDs alone. The trade-off is slightly less total interest than a single long-term CD.
It depends on your goals. As of March 2026, top CD rates are ~4.0-4.3% APY while the Fed funds rate is 3.50-3.75%. CD rates have been declining since late 2024 as the Fed cut rates. Pros: Guaranteed returns, FDIC insured, lock in today's rate before further cuts. Cons: HYSA rates are competitive (~4.0-5.0%) with full liquidity, and the CD/HYSA spread is thin (0.1-0.5%). CDs make most sense if you want to lock in a rate, don't need the money during the term, and believe rates will continue falling.
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