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CD Calculator

Updated January 2026

A CD calculator helps you compare Certificate of Deposit options and understand exactly how much your money will earn. CDs offer a safe, FDIC-insured way to earn guaranteed returns on your savings at higher rates than regular savings accounts.

How to Use This Calculator

Enter the amount you plan to deposit, the CD term in months, the annual interest rate (APY), and how often interest compounds. The calculator shows the total value at maturity, total interest earned, and the effective APY. Compare different terms and rates to find the best CD for your savings goals.

How It's Calculated

CDs use the compound interest formula (typically without additional contributions after the initial deposit):

FV = P × (1 + r/n)^(n×t)

Where P is the initial deposit, r is the annual interest rate, n is the compounding frequency (often daily or monthly for CDs), and t is the term in years. The effective APY accounts for the compounding effect.

Frequently Asked Questions

CD interest can be paid out in several ways: you can have it deposited into a linked account monthly, quarterly, or at maturity; or it can be compounded and paid at the end of the term. Many CDs automatically reinvest interest, which maximizes your return through compounding. Some CDs offer a choice at opening, while others have a fixed structure. Always check the terms before opening a CD.
Early withdrawal from a CD typically triggers a penalty, usually several months of interest. For CDs under 12 months, the penalty is often 3 months of interest. For longer terms, it's typically 6 months of interest. Some no-penalty CDs exist but usually offer lower rates. In extreme cases, the penalty could exceed the interest earned, meaning you could lose some of your principal — so only invest money you won't need before the term ends.
CDs typically offer higher interest rates than regular savings accounts because you lock up your money for a fixed term. However, savings accounts offer immediate access to your funds without penalty. CDs are best for money you won't need for a specific period — like an emergency fund's "tier 2" savings or money set aside for a known future expense. A CD ladder strategy (staggering multiple CDs with different maturity dates) offers a good balance of yield and access.

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