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CD Interest Calculator

Calculate earnings from a Certificate of Deposit (CD).

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Results

Total at Maturity
Interest Earned$459.40

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Assumptions

  • Calculated locally from the inputs shown in this report.

Sensitivity preview

Deposit Amount -10%: Total at Maturity $9,413.46

Deposit Amount Current: Total at Maturity $10,459.40

Deposit Amount +10%: Total at Maturity $11,505.34

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About this CD Calculator

A Certificate of Deposit (CD) is a low-risk savings tool that boosts your earnings. You agree to lock your money away for a set period (Term) in exchange for a higher interest rate than a regular savings account.

How to use this calculator

  1. Enter your Deposit Amount.
  2. Input the APY (Annual Percentage Yield) offered by the bank.
  3. Select the Term in months (e.g., 12, 24, 60).

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

CDs use compound interest. This calculator uses the formula A = P(1 + r/n)^(nt), assuming monthly compounding which is standard for most consumer CDs.

Inputs explained

Deposit Amount

The lump sum of cash you are putting into the CD.

APY

Annual Percentage Yield. This is the effective rate of return per year, accounting for compounding.

Term (Months)

The duration you must keep funds in the account to avoid penalty.

Understanding your results

The Total at Maturity is the full amount you will receive when the CD term ends. The Interest Earned is your profit.

Example scenarios

1-Year CD

$10,000 at 5% APY for 12 months earns ~$500 in interest.

5-Year Jumbo

$50,000 at 4.5% APY for 60 months grows to ~$62,500.

Key Features

  • Simple Interest vs APY support
  • Total profit calculation
  • Monthly term flexibility

Things to Keep in Mind

Assumes earnings are reinvested into the CD (compounded), not withdrawn monthly.

Tips & Best Practices

  • Use a 'CD Ladder' strategy: Buy multiple CDs with staggered maturity dates (1yr, 2yr, 3yr) to keep some money accessible each year while earning higher long-term rates.
  • Check for early withdrawal penalties. They can eat up months of interest if you need the cash sooner.
  • Compare CD rates vs High-Yield Savings Accounts (HYSA). HYSAs offer flexibility but rates can change; CDs lock in the rate.

Glossary of Terms

Maturity Date
The date when the CD term ends and you can withdraw your money penalty-free.
Principal
The original amount of money deposited.
Laddering
A strategy of dividing investment capital across multiple CDs with different maturity dates.

Frequently Asked Questions

Is CD interest taxable?
Yes, interest earned on CDs is generally considered taxable income by the IRS in the year it is earned, even if you don't withdraw it.
What happens when a CD matures?
You typically have a 'grace period' (7-10 days) to withdraw the funds or add more money. If you do nothing, the bank often auto-renews it for the same term.
Are CDs safe?
Yes, bank CDs are FDIC insured up to $250,000 per depositor, making them one of the safest investments available.