CD Ladder Calculator

A CD ladder is a savings strategy where you split your money across several Certificates of Deposit (CDs) with staggered maturity dates. Something comes free every year while the rest keeps earning the higher long-term rates, which is the closest thing to having both liquidity and yield.

Core formula (CD future value): FV = Principal × (1 + Rate/n)^(n × t) where n = compounding periods per year, t = years to maturity.

For a standard CD compounding daily (n = 365): FV = Principal × (1 + APY/365)^(365 × t)

What each variable means:

• Principal: the amount deposited in each CD rung.
• APY (Annual Percentage Yield): the effective annual return after compounding, as disclosed by the bank. Always compare using APY, not APR.
• t: time to maturity in years. Longer terms typically earn higher APY.
• n: compounding frequency. Daily compounding is most common for CDs.
• Maturity Date: when the CD terminates and returns principal + interest.

Example: 5-rung CD ladder with $25,000 total:

Total at end of Year 5: $29,048, so $4,048 in interest on $25,000.

Every figure in that column is the rung compounding annually at its own APY, which is what an APY means. Quote it as rate times years instead and a five-rung ladder comes out several hundred dollars light, because the longer rungs are exactly where compounding does its work.

Why ladder vs. single long-term CD:

• Liquidity: one rung matures every year; you access money without penalties.
• Rate flexibility: if rates rise, you reinvest maturing CDs at higher rates; if rates fall, your locked-in long-term CDs still earn the older higher rate.
• Penalty avoidance: early withdrawal penalties (typically 90–180 days interest) are avoided because you plan around maturity dates.

FDIC insurance: Each CD at a federally insured bank is covered up to $250,000 per depositor, per institution, per ownership category.