Before you choose a CD

CD Calculator Online - Bank CD Interest Calculator

Keep the bank's CD offer next to you. Enter the money you plan to deposit. Then copy the offer's rate and term, and choose an opening date. This free online calculator shows the interest you may earn and the money you may have when the CD ends.

Interest earned Maturity value Rate comparison

Deposit amount Type how much money you want to put in the CD. Example: 5000. Rate input type If the offer says APY, choose APY. If it says Interest rate, choose Interest rate. APY (%) Copy the percentage from the offer. Example: type 4.50 for 4.50%. Opening date Choose the day you plan to put the money in the CD. Term length

12 months is 1 year. What happens to interest? Choose the first option if interest stays in the CD. Choose required payouts only if the bank sends the interest to you.

Total value at term

$10450.0

Total interest

$450.0

How long the CD lasts

12 months

Date the CD ends

Jul 14, 2027

Money still in the CD at the end

$10450.0

Effective APY

4.5%

How the calculator did the math

APY with interest left on deposit

Rate comparison

Well above national average

Your effective APY is 2.85 percentage points above the closest FDIC average.

Quick notes

Copy APY or interest rate exactly as the offer labels it.
Designed for fixed, single-rate CDs. Do not use it for a tiered, stepped, or variable rate.
Uses actual calendar days and a 365-day year; a bank may use 366 in a leap year.
For required payouts over 12 months, enter the bank's interest rate. The estimate assumes no compounding and payouts at least annually.
The estimate is before taxes and assumes you keep the CD until it ends.
The estimate does not include fees or early withdrawal penalties.
Read the bank's rules before opening the account.

Your estimate is the first step

What should you check before locking up the money?

Choose the question that could change your decision, not just the page with the highest rate.

Rate check

Is this APY actually competitive?

Compare the same term, deposit amount, penalty, and maturity rules before accepting the headline rate.

See how to judge the rate → Access check

Could you need this money before maturity?

Compare the CD's dollar advantage with the flexibility you would keep in a savings account.

Compare CD and savings →

Monthly projection; bank crediting dates may differ. Each row reconciles to the cent.

Period	Starting balance	Interest earned	Ending balance

How to use this CD calculator online

Put the bank's offer next to you. Copy each number into the matching box. The CD calculator will do the math and show the dollar result. Then ask: can this cash stay there that long?

1. Enter the amount you would actually put in

If you want to put $5,000 in the CD, type 5000. Use only the money you can leave in the CD until it ends.

For a CD account, you choose the deposit. Check the bank's minimum deposit. Do not enter more money than you want to lock away.

2. Use the same term the bank shows

If the offer says 6 months, type 6 and choose Months. If it says 18 months, type 18 and choose Months. The term tells you how long the money stays in the CD.

APY is a one-year number. A 3-month CD or 6-month CD runs for only part of a year, so its dollar interest is smaller than a full-year result at the same APY.

3. Use APY if the bank shows APY

Find APY or Interest rate on the offer. If it says APY, choose APY and copy that number. APY already includes compounding.

If the offer shows both APY and an interest rate, choose APY for this CD rate calculator. A credit union may say dividend rate or dividend APY. When it says dividend APY, choose APY. See how APY changes the comparison.

Next, read what happens to the interest. Choose required payouts only if the bank sends the interest to you instead of leaving it in the CD.

4. Look at the dollars, not only the APY

Total interest is all the extra money the CD may pay. Total value is your deposit plus all of that interest.

Read the total value as a simple CD return estimate. If the bank pays interest out, some of that money will be outside the CD. Then ask: is the extra money worth locking up your deposit?

5. The math is simple

You do not need to solve this formula. In APY mode, it uses the actual number of calendar days: A = P × (1 + APY)^{days ÷ 365}

P: your deposit
APY: the annual yield
days: the days from opening to maturity

In Interest rate mode, copy the compounding frequency from the offer. The calculator finds the effective APY for you. If the bank pays interest out, the result keeps that interest separate from the CD balance. You do not need to do compound interest math by hand.

For a CD longer than one year that requires payouts, choose Interest rate, not APY. The calculator assumes the interest does not compound and the bank pays interest at least annually.

6. Check the boring details before opening

Before opening the CD, look for the early withdrawal penalty, any account fees, and what happens when the CD renews.

See how today's 12-month APY compares with recent snapshots.

Current CD term curve

Check whether shorter or longer terms are paying more right now.

Why CD rate calculator results change

Banks change CD rates when the interest-rate market changes. Treasury yields and the fed funds rate help explain why a CD rate calculator can look different from one month to the next. Learn how to compare the rate with the term and lock-up cost.

Fed Funds Rate

3.63%

Jun 2026

3-Month Treasury

3.85%

Jul 2026

1-Year Treasury

4.06%

Jul 2026

Practical CD guides

Plan for the parts the calculator cannot decide

Use these guides for access, maturity, insurance, and timing questions tied to a real CD decision.

Before opening

What could an early withdrawal cost?

See a dollar example and the disclosure terms that matter.

Plan access

Should you split the money into a CD ladder?

Create regular maturity dates without pretending every dollar is immediately available.

At maturity

Could the CD renew before you act?

Prepare for the grace period, renewal APY, and next destination for the cash.

Protect the deposit

Is the full CD balance federally insured?

Understand the $250,000 limit across CDs, savings, and other deposits at one bank.

Questions people ask before opening a CD

What numbers do I need for this free CD calculator?

Put the CD offer next to you. Type the deposit amount and opening date. Copy the rate and term from the offer. Then choose whether the interest stays in the CD or is paid to you. If the offer gives an interest rate, also copy its compounding frequency.

Is this a CD rate calculator or a CD interest calculator?

Both. Enter the rate from the offer, and the calculator shows the interest you could earn and the value at maturity.

How much interest will I earn on a CD?

Enter the deposit, rate, opening date, term, and what happens to interest. The CD calculator shows the estimated interest earned, CD balance, and total value.

What is the difference between an interest rate and APY for a CD?

The interest rate is the stated annual rate before compounding. APY includes compounding, so APY is the better number for comparing CD offers.

What if a credit union calls it a dividend rate or dividend APY?

Credit unions often use dividend wording for certificates. Choose APY when the offer shows dividend APY; choose Interest rate when it shows only a dividend rate.

Can I use this as a bank CD calculator?

Yes, for a fixed, single-rate CD. Start with the bank's APY or interest rate, term, minimum deposit, and payout rule. Tiered, stepped, and variable-rate CDs need their own contract-specific calculation.

Does the calculator support CDs that pay interest out?

Yes. Choose required payouts when the bank does not let interest remain in the CD. For a term longer than one year, choose Interest rate, not APY. The calculator then assumes the CD does not compound and pays interest at least annually. The monthly table shows interest building up; it is not the bank's actual payout calendar.

Does daily or monthly compounding change the CD estimate?

If the bank gives APY, compounding is already included, so frequency should not change the result. If the bank gives only an interest rate, the selected frequency changes the effective APY and the estimate.

Can I use this as a 3-month CD calculator or 6-month CD calculator?

Yes. Enter 3 months or 6 months as the term. The estimate uses the actual calendar days between the opening and maturity dates, so the result is not forced into month divided by 12.

Why do national average CD rates look lower than best online offers?

Averages include many banks and credit unions, including ones paying low rates. Best-rate lists usually show only the most competitive offers.

Does this calculator include early withdrawal penalties?

No. It uses the full CD term. If you cash out early, the bank's penalty can reduce or even wipe out some of the interest.