CD Calculator

Estimate CD maturity value, total interest, and derived APY from an opening deposit, nominal annual rate, term, and compounding frequency.

CD assumptions

This projects gross maturity value from one opening deposit using the selected annual rate and compounding schedule. Taxes, rate changes, and early withdrawal penalties are not included.

Display currency

Result

$12,833.59

Estimated maturity value after 5 years at 5.12% APY.

Total interest
$2,833.59
APY
5.12%
Opening deposit
$10,000.00
Compounding
Monthly

Growth note

The selected nominal rate compounds monthly over 5 years, yielding a gross balance estimate before penalties or taxes.

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Savings Basics

CD calculator guide: maturity value, total interest, and APY from a nominal rate

A CD calculator estimates how one certificate of deposit grows from an opening deposit, a stated annual rate, a term, and a compounding schedule. This version treats the rate you enter as a nominal annual rate, then projects the gross maturity value, total interest earned, and the derived APY for the selected compounding frequency.

What this calculator is measuring

A certificate of deposit usually locks in a deposit for a fixed term at a stated rate. The maturity value depends on how often interest compounds and whether the quoted rate is being treated as a nominal rate or as APY. This calculator keeps the scope explicit by asking for a nominal annual rate and then deriving the APY from the chosen compounding schedule.

That makes the tool useful for first-pass comparisons between CD offers, especially when two accounts have the same headline rate but different compounding assumptions. The result is a gross estimate before tax or penalty effects.

Rate, compounding, and APY

Nominal annual rate is the stated percentage before compounding effects are layered in. APY reflects how much that rate becomes over a full year once compounding is taken into account. More frequent compounding raises APY when the nominal rate stays the same.

That is why the calculator shows both the projected maturity value and the derived APY. One number helps with term-end planning, while the other helps compare offers that may quote rates differently.

Maturity value = Deposit x (1 + r / m)^(m x t)

Deposit grows at nominal annual rate r, compounded m times per year, across t years.

APY = (1 + r / m)^m - 1

APY converts the nominal annual rate into an effective annual yield after compounding.

Worked example: 10,000 at 5% for 5 years

Suppose the opening deposit is 10,000, the nominal annual rate is 5%, the term is 5 years, and compounding is annual. The projected maturity value is 12,762.82, which means total interest of 2,762.82 over the term.

If compounding became more frequent while the nominal rate stayed at 5%, the maturity value would rise slightly and the derived APY would move above 5.0%. That is why comparing APY alongside the maturity value is useful when shopping for a CD.

What this estimate excludes

This calculator models one opening deposit only. It does not include add-on deposits, partial withdrawals, early-withdrawal penalties, callable features, brokered-CD pricing, taxes, or institution-specific compounding quirks.

The page also does not assume every projected balance is fully insured in every case. Deposit-insurance treatment depends on ownership category, account structure, and the applicable coverage limits.

Further reading

Frequently asked questions

Is the rate input nominal rate or APY?

This version treats the entered rate as a nominal annual rate. The calculator then derives APY from the selected compounding frequency.

 Why does more frequent compounding increase APY?

More frequent compounding means interest is added to the balance more often, so later interest calculations are made on a slightly larger balance. That raises the effective annual yield when the nominal rate is unchanged.

 Does this calculator include early-withdrawal penalties?

No. It shows the gross maturity estimate only. Early-withdrawal penalties, callable features, taxes, and special bank rules are outside the current scope.

 Does FDIC insurance mean every balance is fully protected?

Not automatically. FDIC coverage depends on ownership category and coverage limits. Large or unusually structured balances may need a separate insurance review.

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