Cd CalculatorCD basics
How CDs Work
Understand CD terms, maturity, APY, renewal, grace periods, deposit insurance and the tradeoff between rate certainty and liquidity.
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CD Guides and Resources
Plain-English explanations of certificate of deposit terms, APY, maturity and early-withdrawal penalties, supported by formulas, worked examples and links to primary sources.
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Certificate of deposit guides
APY
What Does APY Mean for a CD?
Learn how APY works on a CD, how it differs from the stated interest rate and how term length changes estimated earnings.
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Read What Does APY Mean for a CD?CD penalties
CD Early Withdrawal Penalties
See how CD penalties may be calculated, when they can consume accrued interest and what to verify before cashing a CD early.
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Use a CD calculator
Estimate one CD with the CD Calculator, compare offers with the CD Comparison Calculator, or model a written penalty using the CD Early Withdrawal Calculator. Results are educational estimates; verify official terms with the financial institution.