CD Calculator | Certificate of Deposit Interest & Maturity
Calculate how much interest a CD earns at maturity
Model multi-rung CD ladders, estimate early withdrawal penalty costs, and compare CD APY offers side by...
When Should You Use This Calculator?
- Calculate CD maturity value and total interest earned over the term
- Run the calculator per offer to compare CD rates, terms, and compounding frequencies
- Plan savings with Certificate of Deposit investments for short or long-term goals
- Understand the impact of compounding frequency (daily, monthly, quarterly) on CD returns
- Calculate early withdrawal penalties to make informed decisions about CD liquidity
How to Use This Calculator
- Choose mode: Simple CD, Ladder, or Penalty analysis.
- Enter the deposit amount, APY, and term length.
- Select how often interest compounds (daily, monthly, or annually).
- In Ladder mode, set the number of rungs to stagger maturity dates.
- Review the maturity value and total interest, and weigh any early-withdrawal penalty.
Key Features:
- Three modes: Simple CD, Ladder, and Penalty analysis
- CD maturity value calculation with compound interest
- Ladder rung breakdown with staggered maturity modeling
- Early withdrawal penalty impact and effective-rate context
Formula
Maturity Value = Principal × (1 + APY/n)^(n × years)
- n is the number of compounding periods per year (e.g., 12 for monthly).
- Total interest = Maturity Value − Principal.
- Early withdrawal penalty is typically subtracted from earned interest.
Frequently Asked Questions
Are CD rates fixed?
Yes, standard CDs have fixed interest rates for the entire term, so your return is locked in regardless of market changes. That makes them low-risk, FDIC-insured savings vehicles well suited to money you won't need until maturity.
What happens if I withdraw early from a CD?
Most banks charge an early withdrawal penalty, typically 3-6 months of interest for short terms and 6-12 months for longer terms. Use the Early Withdrawal Penalty mode in this calculator to see the net interest after penalties and whether breaking the CD makes financial sense.
What is a CD ladder strategy?
A CD ladder spreads money across multiple CDs with staggered maturity dates (e.g., 1-year, 2-year, 3-year). When each CD matures, you reinvest at current rates. This gives you regular access to funds while capturing higher long-term rates. Use the CD Ladder mode to model a multi-rung strategy.
How do I compare CD APY offers from different banks?
Run the calculator once per offer with the same principal and term, entering each bank's advertised rate and compounding frequency. Compare the "Effective Rate (APY)" and maturity value each run produces — the offer with the highest effective APY, not just the highest advertised rate, wins if terms and compounding frequency differ.
How much will a $10,000 CD earn?
It depends on the APY and term. A $10,000 CD at 5% APY compounded monthly earns about $500 in one year, or roughly $1,576 over three years as interest compounds. Enter your deposit, APY, term, and compounding frequency above to see the exact maturity value and total interest for your CD.
What is the difference between CD interest rate and APY?
The interest rate (or APR) is the stated annual rate before compounding. APY (Annual Percentage Yield) includes the effect of compounding, so it is always equal to or higher than the interest rate. Banks advertise APY because it reflects your actual annual return — this calculator shows both: enter the stated rate, and the results include the effective APY after your chosen compounding frequency.
Can a CD pay out interest instead of compounding it?
Yes, some CDs let you receive interest payments each period instead of reinvesting them in the CD — useful if you want regular income, such as in retirement. Because that interest is withdrawn rather than compounded, it grows as simple interest instead of compound interest, so the total return is lower than a reinvested CD at the same rate. Switch Interest Payout to "Paid Out" in this calculator to see that comparison.
Can I export my CD Calculator calculations?
Yes. In guest mode you can export your calculations to JSON. Signing in adds PDF and CSV export. Click the export button to download your results — useful for record-keeping, sharing, or importing into other tools.
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