CD Calculator – Calculate Interest, APY & Maturity Value

CD Calculator

Your CD details

Initial deposit

Interest rate (APY)

Compounding frequency

Deposit length

yrs

Include tax on interestEstimate what you keep after tax

Early withdrawal penalty (estimate)

If withdrawn before maturity $0

Estimated using standard banking conventions. See the full Early Withdrawal Penalty Calculator for complete reinvestment analysis.

End balance

$0.00

Deposited $0 Earned $0

Total interest

$0.00

Effective APY

0.00%

Term

0 mo

Principal vs. interest

0%interest

Principal $0

Interest $0

Balance growth

Accumulation schedule

Period	Deposit	Interest	Balance

Compare and adjust your results

See how your CD stacks up against a savings account, and what your balance is really worth after inflation.

CD vs. high-yield savings

Savings APY

CD balance Fixed $0

Savings balance Variable $0

A high-yield savings rate can change anytime. A CD locks your rate for the full term.

Inflation-adjusted return

Expected inflation

Nominal end balance $0

Real (inflation-adjusted) value $0

Your real return shows what your balance can actually buy in today's purchasing power.

Related calculators

How Does a CD Calculator Work?

A CD calculator shows how much your CD may be worth at maturity. It uses your deposit, interest rate, CD term, and compounding frequency. Enter the details from your bank. The calculator gives your estimated maturity value and total interest. You can enter your initial deposit, APY, compounding frequency, and CD term. You get the results in seconds.

Short Answer: A CD calculator uses compound interest to estimate your CD earnings.

Basic Formula:

Maturity Value = Principal × (1 + Rate ÷ Compounding Periods)^(Compounding Periods × Term)

It helps you see your CD earnings, maturity value, and estimated return before opening a CD.

Why People Use a CD Calculator

APY, alone, will not give one an idea about what a particular deposit will be worth in six months or two years. The calculations should be done in order to see how much money one can expect to earn from the investment in actual dollars and not in percentage terms.

There are three common needs when it comes to calculations using APY. First is to make sure that the bank will actually offer what it claims. The second is to compare different offers, and the third is to check the cost of an early withdrawal.

Run the calculator

A certificate of deposit is a type of time deposit. a fixed income investment that is purchased for a predetermined period in return for a predetermined or variable rate of return and whose withdrawal is not possible before the term expires. It will only take you three steps—calculations are free for you.

1. Input your terms – initial deposit amount, APY, term, and compounding periods.

2. See the output – maturity amount, accumulated interest, and effective APY.

3. Calculate the exit—make adjustments for early withdrawal.

Reading Your Results

Maturity Value

The total sum of the principal plus interest earned up until the maturity date.

Interest Earned

The amount of money that will be earned from the total sum of principal invested.

Effective Annual Percentage Yield

The annual percentage yield considering the compound effect.

Estimated Early Withdrawal Fee

The fees incurred when withdrawing the funds before maturity.

Interest earns continually but gets posted periodically on either a daily, monthly, or maturity basis. This is the reason why the early withdrawal does not involve future earnings. since interest only gets posted after its period of accumulation.

Earnings from a Certificate of Deposit (CD) represent interest earnings and are reportable to the Internal Revenue Service (IRS) through form 1099-INT if the account earns $10 in a single calendar year. The interest earnings are taxable even if the CDs haven’t matured.

Formula for CD Calculator

A = P(1 + r/n)^(nt)

Where,

P—Principal or the starting deposit balance.
r—Annual nominal interest rate.
n—Compounding periods, the number of times the interest gets compounded every year.
t—Duration in years.
A—Amount at maturity.

This is the same formula for calculating compound interest used in all savings accounts and other interest-yielding accounts. The calculations for CDs are more reliable than those for variable interest rates. Since r does not change through the term period.

How APY Affects the Outcome of an Investment

The terms APY and APR get easily mixed up with each other. While APR does not include any compound interest in its calculation. APY takes into account how many times it is compounded per year. The APY is disclosed by banks with regard to their deposit accounts. as this is the number that corresponds to the true amount earned.

At the same time, the factor that impacts a CD’s result the most is APY. It is more influential than the compounding frequency and even differences in term length in most cases when the horizon is one year:

$5,000 deposit, one-year term, monthly compounding

APY	Maturity Value	Interest Earned
3.00%	$5,152.08	$152.08
4.00%	$5,203.71	$203.71
5.00%	$5,255.81	$255.81

In case of a two-point spread in APY on a deposit of $5,000, the difference in earnings amounts to a little over $100. And that will scale with both the principal and term of deposit. In any yield comparison between banks, use APY—not the headline rate; one of those numbers will tell you what you’ll really earn. What Is APY (/guides/what-is-apy) explains the difference in detail.

Worked Example: $10,000 at 5.00% for One Year

Compounding Frequency	Maturity Value	Effective APY
Annual	$10,500.00	5.00%
Semiannual	$10,506.25	5.06%
Quarterly	$10,509.45	5.09%
Monthly	$10,511.62	5.12%
Daily	$10,512.67	5.13%

Key Takeaways

✓ Different compounding frequencies impact maturity value even in cases.

Common Missteps When Using the CD Calculator

The above table is based on optimal conditions without interruptions. There are certain ways in which real-life accounts will be different from what is shown there:

Common Missteps

Inputting nominal rate as opposed to APY, which underestimates true returns.
Relying on annual compounding while the bank uses daily or monthly compounding.
Overlooking early withdrawal (or early redemption) penalties.
Forgetting that interest is taxable at the time of crediting rather than maturation.
Comparison of two CDs based on rates alone without looking at compounding periods and duration.

Clculator Feature

The CD calculator available for free works completely within your browser. No account is needed, nor any email address or ads.
Compound interest is supported on a daily, monthly, quarterly, biannual, and annual basis.
Calculates the early withdrawal fee based on expected interest earned.
Supports terms ranging from 30 days up to 10 years.
Can compare multiple terms simultaneously for CD laddering.
Simulates a situation when the current rate lock is compared to an unknown future rate.

Advantages of using a CD calculator

Using the correct formula eliminates any chance of having to use the wrong figure by estimation. In addition, the use of the calculator enables one to see the opportunity cost of choosing to invest in a shorter investment period. since the difference in yields between a 6-month and a 12-month investment can be clearly shown.

How Early Withdrawal Penalties Impact Earnings

A common structure charges a set number of months of interest as the penalty, regardless of what’s accrued. Example: $10,000 at 5.00% APY, 12-month term, withdrawn after 6 months instead of held to maturity:

Interest accrued at 6 months: $252.62
Typical penalty (≈90 days of interest): ≈$123.29
Net interest kept: ≈$129.33

Roughly half the accrued interest is given up by exiting at the halfway point under this common structure—worth modeling through the CD calculator before opening the account, not after. See CD Early Withdrawal Penalty Explained for penalty structures by bank type.

What Happens When Your CD Matures

Generally speaking, banks provide a grace period of about 7-10 days after your maturity date. during which you are free to withdraw, deposit additional money, or change the terms of the CD without any penalties.

If no action is taken, the CD automatically renews, sometimes called a rollover, into the same term CD with a new interest rate being currently offered by the bank. which might be either higher or lower than the initial rate. Rollover is not a guarantee of a good deal—test the new rate using the CD calculator above.

Common maturity instructions (commonly referred to as maturity options). Cash out, rollover at the new interest rate, or split your balance between terms. You’d better mark the grace period in your calendar. Missing it will normally lead to automatic renewal into a new term. See What Happens at CD Maturity to find out the rules of grace periods by banks.

Types of CDs

They offer different results in exchange for either rate certainty, access, or minimum balance requirements. Now, after finding out the interest rate and term offered, the CD calculator above calculates anything you’d like.

Fixed-Rate CD

The interest rate remains fixed throughout the entire term. Hence, the maturity value is always calculable on day one—the default choice to achieve full clarity.

Variable-Rate CD

The interest rate varies during the term—therefore, the maturity value of a variable-rate CD is always projectable based on assumptions. but never calculable in advance.

No-Penalty CD

The withdrawal of funds is allowed prior to maturity without any fees. but at a reduced APY—a great tool to keep your money safe when there is a chance you will need it earlier.

Jumbo CD

Requires a higher initial deposit amount—normally $100,000+—for a somewhat increased interest rate. Please note that both FDIC and NCUA deposit insurance limits apply to a total of deposits per owner. and not to deposits per account; thus, amounts over $250,000 should be split.

Brokered CD

Purchased via a brokerage firm, often tradeable on the secondary market prior to maturity. which modifies the early-withdrawal calculation.

Callable CD

The bank is entitled to prematurely close the CD in case the interest rates fall below a certain level.

FDIC-Insured Bank vs. NCUA-Insured Credit Union CDs

The main difference lies in the kind of deposit insurance and eligibility to open the account. and not in math, which remains exactly the same regardless. Banks are usually insured by the FDIC up to $250,000 per depositor, per bank, per ownership category automatically without any paperwork.

Credit unions also provide NCUA deposit insurance on the same amount. but require membership and sometimes refer to the rate as “dividend rate.” Tax treatment is the same either way. Neither is better than the other and depends on which one provides the highest rate and easier access to the CD.

Here’s one feature available in both that is usually overlooked by depositors. Naming a payable-on-death (POD) beneficiary to the account helps increase coverage far beyond $250,000. At least under the existing FDIC regulations. Each named POD beneficiary increases the coverage limit by $250,000 up to $1,250,000 per owner once five or more beneficiaries are named.

NCUA follows suit starting from December 1, 2026, but the actual date may differ. However, either way, make sure to verify the actual rate using the CD calculator—math is the same regardless of whether it’s a bank or a credit union holding the deposit. See Bank vs. Credit Union CDs.

Factors that influence CD growth

Principal

Larger amounts earn greater interest, proportional to the increase in the amount, at the same rate; no threshold effect occurs.

APY

The single most powerful driver of your gain, exceeding all others.

Compounding period

Compounding daily and monthly creates a slightly higher APY than annually.

Duration

Longer periods earn more accumulated interest. but involve a longer tie-up of funds and a greater risk if the rate environment changes.

The rate environment

CD rates are correlated to the Fed policy rate; they rise together if the former increases.

Risk attitude and liquidity

Funds intended for early use should be allocated to a shorter-term CD or a penalty-free one.

When and Who Should Use This Calculator

Suitable use cases: people comparing a fixed-rate CD to high-yield savings, retirees looking for regular interest payments, people bridging known expenses, and ladders. In essence, any person who needs a set amount of interest as opposed to an opportunity for more flexible usage.

Selecting term length: choose the maturity that matches your need for funds. Without a set date, it will be gambling with the rate environment, and diversifying across several term lengths will limit that gamble. Comparing all possible term lengths in the CD calculator will give you a precise difference in interest earned before making the choice. Choosing a CD term offers the complete process.

Frequently Asked Questions

The interest projections are correct. But the 1099-INT statement provided by the bank becomes official for the purpose of tax filing. The interest earned is taxable when it gets credited. not necessarily when the CD reaches its maturity date.

APY takes into consideration the effect of compounding, while a nominal rate does not. In case the quoted nominal rate exceeds the APY of the product advertised. One should verify what assumptions were made about the compounding frequency.

Yes—the maximum insurable amount per depositor, per financial institution, per ownership category is set at $250,000 through the FDIC in the case of banks or the NCUA in the case of credit unions. Checking the CD calculator on Navy Federal’s website means coverage by NCUA rather than FDIC. See Bank vs. Credit Union CDs above for the ways beneficiary designations increase that limit.

A CD cannot be affected by market losses because of all its features. The amount of funds and the rate are specified upon their issuance. There are basically two ways when a CD becomes a losing investment. early withdrawal penalties reducing the earned interest and the high inflation rate exceeding the fixed rate.

Sources

Official U.S. government and regulatory agencies referenced in this calculator’s methodology.

FDIC Federal Deposit Insurance Corporation

NCUA National Credit Union Administration

IRS Internal Revenue Service

CFPB Consumer Financial Protection Bureau

Federal Reserve Federal Reserve System

Calculation Details

Last Update: July 2026

Calculation Technique

The maturity value is calculated according to the compound interest formula A = P (1 + r/n)^(nt). No rounding is done until the final result.

A = P (1 + r/n)^nt

Restrictions on Using the Formula

The calculation is based on an ideal compounding period. Some banks apply alternative counting of days (actual/365 or actual/360). It impacts the result of the calculation for ordinary deposits by one cent or two.

Updating of Interest Rates

Certificates’ rates are changing permanently and are not collected automatically from other pages. Calculations made in this document are purely for demonstrative purposes. Please refer to Current CD Rates (/latest-cd-rates) for the current rates.

What May Impact The Estimated and Real Returns?

Promotion of steps in rates. A bonus in the rate for the relationship, account fees, and interest-crediting policy of the bank are factors that can affect the actual return.

Assumptions

Worked-out calculations take into account no fees in the account. a fixed-rate certificate with no mid-term changes and prompt crediting of interest. The policy of the individual bank may differ.