CD Calculator
When you need to check cD, the CD gives you a clear starting point. Enter one realistic example first, then compare another option if useful.
Value at maturity
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Interest earned —
Effective APY —
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How it works
A = P(1 + r/m)^(m·t) where m is compounds per year and t is yearsHow to use the CD
Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.
Use the result as a planning estimate. Rates, fees, rules and personal circumstances can change the final figure.
Frequently Asked Questions
How is CD interest calculated?
CDs compound at a fixed rate for a fixed term — daily, monthly or quarterly depending on the bank. A $10,000 CD at 4.5% APY for 18 months matures at about $10,690.
What is the difference between rate and APY?
The nominal rate is before compounding; APY includes it. Banks advertise APY because compounding makes it slightly higher — compare CDs by APY.
What happens if I withdraw a CD early?
Banks charge an early-withdrawal penalty, typically 3–12 months of interest. If you might need the money, a no-penalty CD or high-yield savings account is safer.