How does a CD ladder work?

A CD ladder splits one deposit across several CDs with staggered maturity dates, so part of the money frees up at regular intervals while the rest keeps earning longer-term rates. Divide the total by the number of rungs and assign each rung a term stepping evenly up to the longest. Put $50,000 into five rungs of $10,000 at 12, 24, 36, 48 and 60 months, paying 4.30%, 4.40%, 4.50%, 4.55% and 4.60% APY respectively, and the ladder returns $57,210.61 — $7,210.61 of interest — with a money-weighted blended yield of 4.47%. As each rung matures you either take the cash or roll it into a new longest rung, which keeps the cycle running. The point is that it removes the timing decision: you are neither betting rates will fall by locking everything long, nor giving up yield by keeping everything short.

How many rungs should a CD ladder have?

Between four and six for most savers, because the useful trade-off is between how often cash becomes available and how much admin you are willing to do. More rungs means shorter gaps between maturities and a blended yield closer to the average of the curve; fewer rungs means less to track but longer stretches where nothing is accessible. A five-rung ladder over 60 months frees up a fifth of the balance every twelve months. On $50,000 split into five $10,000 rungs at 4.30% through 4.60% APY, the first rung returns $10,430.00 after a year while the 60-month rung continues to $12,521.56. The number that actually matters is the shortest rung, since that sets how soon you first get access. Pick the interval you need cash at, then work backwards to the rung count.

Is a CD ladder better than one long CD?

It depends entirely on what you believe rates will do, which is why most people should prefer the ladder. A single long CD wins if rates fall, because you locked the higher rate across the whole balance. It loses if rates rise, because every dollar is stuck. A ladder splits that bet: $50,000 in one 60-month CD at 4.50% APY returns $62,309.10, while the same $50,000 laddered across 12 to 60 months at 4.30% to 4.60% returns $57,210.61 — less in this particular rate environment, but with a fifth of the balance becoming available every year rather than none for five years. You are paying some yield for liquidity and for not having to forecast. If you genuinely have no view on rates, that is a sensible price.

CD Ladder Calculator

ラダーを組み、加重平均利回りをその場で確認できます。

Build a CD ladder rung by rung and see maturity dates, blended yield and total interest update live.

利息合計: $6,513.50
加重平均 APY: 4.20%

あなたのラダー

ラダー総額

$10,000.00 per rung across 5 CDs

ラダーの本数

最長期間

月

Rungs step every 1 年

複利頻度

各本数の金利 (APY)

1 年4.50%

2 年4.30%

3 年4.15%

4 年4.05%

5 年4.00%

利息合計: $6,513.50
全満期時のラダー総額: $56,513.50
加重平均 APY: 4.20%

満期スケジュール

#1
1 年4.50%
$10,450.00
#2
2 年4.30%
$10,878.49
#3
3 年4.15%
$11,297.38
#4
4 年4.05%
$11,721.10
#5
5 年4.00%
$12,166.53

Splitting $50,000.00 across 5 rungs up to 5 years earns $6,513.50 in total interest at a blended 4.20% — with $10,450.00 becoming available after just 1 年.

Each rung is calculated independently with A = P(1 + r/n)^nt and runs entirely in your browser. Reinvestment of maturing rungs is not assumed.

無料 — 登録不要
入力と同時に更新
ブラウザ内で動作

計算式とコンテンツの最終確認日 2026年7月21日. 銀行の金利は頻繁に変動します。最新の金利は必ずご利用の金融機関に直接ご確認ください。

結論から

CDラダーはどのような仕組みですか？

A CD ladder splits one deposit across several CDs with staggered maturity dates, so part of the money comes free at regular intervals while the rest keeps earning longer-term rates. Divide the total by the number of rungs, assign each rung a term stepping evenly up to the longest, and compute each with A = P(1 + r/n)^(nt). The ladder's blended APY is the deposit-weighted average of the rung rates, not a simple average, so an unequal ladder tilts toward whichever rungs hold the most money. The point of a ladder is that it removes the timing decision: you are neither betting that rates will fall by locking everything long, nor giving up yield by keeping everything short. As each rung matures you either take the cash or roll it into a new longest rung, which keeps the cycle going.

計算式と手法

計算方法

Blended APY = Σ (rateᵢ × amountᵢ) ÷ total deposited

Each rung's rate weighted by the dollars in it gives the ladder's overall yield.

rateᵢ: APY on rung i
amountᵢ: Dollars placed in rung i
Σ: Sum across every rung

手順

1
Divide your total deposit by the number of rungs to size each CD.
2
Assign staggered terms — 5 rungs over 60 months means 12, 24, 36, 48 and 60 months.
3
Look up the bank's rate for each term and enter it per rung.
4
Calculate each rung independently with A = P(1 + r/n)^(nt).
5
Sum the maturity values for the ladder total, and weight the rates by amount for the blended APY.

ガイド

この計算機の使い方

4つの入力だけで、結果はその場で表示されます。送信も会員登録も不要です。

1
Enter your total amount
The full sum you want laddered. The tool splits it evenly across the rungs you choose.
2
Choose the number of rungs
Four or five is typical. More rungs mean more frequent access to cash but smaller individual CDs.
3
Set the longest term
This anchors the ladder. Terms step evenly from the shortest rung up to this maximum.
4
Tune each rung's rate
Enter your bank's actual rate for each term. Longer rungs usually pay more, and the ladder diagram redraws as you type.

例

計算例

実際の数値を最後まで計算しています。ご自身の数字と照らし合わせて、計算機の結果を確かめられます。

$50,000 laddered across 5 rungs over 60 months

Total: $50,000
Rungs: 5 × $10,000
Terms: 12, 24, 36, 48, 60 months
Rates: 4.50% / 4.30% / 4.15% / 4.05% / 4.00%

Total interest: $6,513.50
Ladder value at full maturity: $56,513.50
Blended APY: 4.20%
First cash available: 12 months

You capture most of the 5-year rate while still freeing $10,000 plus interest every twelve months.

算出方法

精度と前提条件

どの計算機にも前提条件があります。当サイトの前提を明記しますので、この数値が何を織り込み、何を織り込んでいないかがはっきり分かります。

Rungs are funded on the same day and sized equally — uneven ladders are possible but change the blended yield.
Rates shown per rung are the bank's current rates for those terms; real rates change between rungs maturing.
The model does not assume reinvestment. In practice you would roll each maturing rung into a new long-term CD.
Each rung is a separate CD with its own early withdrawal penalty.

計算の慣行は、米国の金融機関が預金口座のAPYを開示する方法を定めたRegulation DD（12 CFR 1030）に従っています。付保対象の金融機関への預金は、預金者ごと・銀行ごと・所有区分ごとに$250,000までFDICで保護されます。

一次情報

これらのルールの出どころ

この計算機が従う慣行は、当サイトではなく規制当局が定めたものです。各項目は定めている機関にリンクしていますので、当サイトの説明を信じるのではなく、ご自身で確認いただけます。

詳細

重要なポイントとルール

CDを開設または継続する前に知っておきたい要点をまとめました。

Laddering reduces interest-rate risk: if rates rise you reinvest a rung soon; if they fall your long rungs stay locked at the old higher rate.
Once a ladder is mature, rolling each maturing rung into the longest term means you eventually earn long-term rates on everything while still having annual access.
A 'barbell' variant puts money only in the shortest and longest terms; a 'bullet' targets one future date with several CDs maturing together.
FDIC insurance covers $250,000 per depositor per bank — a large ladder can be split across institutions to stay fully covered.

つながり

この計算機が役立つ方

Retirees building income
You want a rung maturing every year to cover annual expenses without touching the rest.
Rate-uncertain savers
You do not want to bet on rates going up or down, so you hedge across terms.
Emergency-fund holders
You want better-than-savings yield but need part of the money reachable without a penalty.

CD計算機のすべて

譲渡性預金（CD）の全体像を、9つの専用ツールでカバーしています。

よくある質問