CD Term Calculator
Pick a term from 3 to 60 months — including popular 9, 12, and 18-month CDs — or enter a custom term, and see the maturity value, interest earned, and maturity date.
Estimates only — not financial advice. This calculator gives approximate figures for planning. It is not financial, tax, or legal advice; check with a qualified professional before making decisions.
How the CD term calculator works
Certificate of deposit interest compounds monthly at APY ÷ 12. This calculator grows your deposit at that monthly rate for the full term, then shows the maturity value, the interest earned, and the calendar date the CD matures — so a 9-month CD opened today shows exactly when your money frees up.
Longer terms usually pay higher APYs, but not always: banks sometimes price 9 or 18-month “special” CDs above their 12-month rate to attract deposits. Run the same deposit through a few terms here before you lock in.
FV = P × (1 + APY/1200)n · maturity date = today + n months
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CD term calculator FAQ
What is a 9 month CD?
A certificate of deposit with a 9-month term. Banks often offer 9-month CDs as promotional “specials” with rates above standard 6 or 12-month CDs — compare them with this calculator before choosing.
How is CD interest calculated — APY vs APR?
APY (annual percentage yield) includes compounding, so it is the number that tells you what you actually earn. APR without compounding understates the result; this calculator compounds monthly at APY ÷ 12.
Are 6 month CD rates better than 12 month?
Sometimes. When banks expect rates to fall, they may price short terms aggressively; when they expect rises, longer terms pay more. Run both terms above with current quotes and compare the maturity values.
Is an 18 month CD worth it?
It can be the sweet spot: longer than the 12-month standard for a rate bump, but your money is not locked away for years. Compare 12 vs 18 months above — the extra interest may surprise you.
What happens when a CD matures?
The bank typically gives you a grace period (often 7–10 days) to withdraw or move the money. If you do nothing, most CDs auto-renew into a new term at the then-current rate.