Certificate of Deposit (CD) Calculator
Estimate what your CD could be worth at maturity. Enter your deposit, rate, term, and compounding frequency to see the ending balance, total interest earned, and the effective APY implied by the compounding schedule.
Educational estimates only. Real CDs may have promotional rates, early withdrawal penalties, and tax rules that change results.
Last updated: May 9, 2026
CD calculator: the quick way to sanity-check a rate
People usually search for a CD calculator because they want one of two answers: “How much will this CD be worth at maturity?” or “Is this CD rate actually good?” This page gives you a clean maturity value plus the interest earned, so you can compare offers without a spreadsheet.
What a certificate of deposit (CD) is, plain English
A certificate of deposit is a time‑locked savings product. You deposit a lump sum, agree to leave it for a set term (like 6 months, 12 months, or 5 years), and the bank pays interest. In exchange for giving the bank certainty about your funds, CDs often pay more than a basic savings account, especially for specific terms during certain rate environments.
The tradeoff is flexibility. Most CDs have an early withdrawal penalty if you cash out before maturity. That’s why it’s worth calculating not just the ending value, but also the opportunity cost of locking the money up.
How to use this CD calculator
Start with your deposit amount, then enter the annual interest rate shown by the bank. Next, set the term in years (for example, 1.5 for an 18‑month CD) and select the compounding frequency. Many CD disclosures mention compounding like daily or monthly, which changes the effective yield slightly.
If you want a conservative number, switch “Taxes & fees included?” to include a small annual drag. Taxes vary widely by situation and jurisdiction, so this isn’t tax advice, it’s a planning shortcut when you want a more realistic “what will I keep?” estimate.
APR vs. APY (and why it matters for CDs)
Banks may advertise an APY (annual percentage yield), which already accounts for compounding. They might also show an interest rate (sometimes called APR or nominal rate) alongside compounding details. If you only have a single APY number, the simplest estimate is “deposit × (1 + APY)^years.”
This calculator is built for the common real‑world case: you have an annual rate and a compounding schedule. It also shows the effective APY implied by your inputs, so you can compare apples to apples across offers.
What makes one CD better than another?
A higher rate is great, but the best CD depends on your timeline and your need for access. When comparing offers, look at:
- Term: Longer terms can pay more, but they also lock your money longer.
- Compounding: Daily vs. monthly compounding is usually a small difference, but it can matter for close comparisons.
- Early withdrawal penalty: A “great” rate can be less great if the penalty is harsh and you might need the funds.
- Minimum deposit: Some promotional CDs require larger deposits.
Examples you can copy
- “How much will I have?” Enter $10,000, a 1‑year term, and the advertised rate. The maturity value tells you the end balance.
- “Is this worth locking up?” Run the same deposit across 6‑month, 12‑month, and 24‑month terms. The difference between maturity values is the “reward” for giving up flexibility.
Common mistakes (and how to avoid them)
- Mixing up APY and interest rate: If you enter an APY as if it were a nominal rate with frequent compounding, you can slightly overstate results.
- Ignoring taxes: CD interest is typically taxable in many places. If you want conservative planning, use the “drag” option.
- Forgetting the penalty risk: If you might need the money, consider a shorter term or a ladder strategy.
- Comparing only the headline rate: The best choice depends on term, flexibility, and how certain you are you can hold to maturity.
CD laddering (why people do it)
A CD ladder splits your money across multiple terms (for example, 6 months, 12 months, and 18 months). The idea is simple: you get access to a portion of your funds at regular intervals, while still earning CD rates on the portions that remain locked. Laddering can reduce the stress of picking “the perfect term,” because you’re not making one all‑or‑nothing decision.
Next step: browse related calculators
Once you’ve estimated your CD maturity value, you may want to compare it against other plans. Browse the full library at /calculators/, or jump to the tools most closely related to CDs: compounding, inflation, and savings goals.
FAQ
How do I calculate CD maturity value?
Enter your deposit, annual interest rate, term, and compounding frequency. The calculator estimates the balance at the end of the term (maturity value) and the interest earned along the way.
Is the rate on a CD the same as APY?
Not always. APY accounts for compounding, while the stated interest rate can be a nominal rate. This calculator shows an effective APY based on your compounding selection.
Does daily compounding make a big difference for CDs?
Usually it’s a small difference. For most deposits and terms, the bigger levers are the rate and how long you keep the CD, not whether compounding is daily or monthly.
Do CD results include taxes?
By default, no. You can add a simple annual “drag” estimate to model taxes/fees as a conservative planning step, but it’s not tax advice.
What if I withdraw a CD early?
Most CDs charge an early withdrawal penalty, often a set number of months of interest. That penalty can materially reduce returns if you don’t hold to maturity.