Estimate the maturity value of a Certificate of Deposit (CD) or any interest-bearing account.Compare annual percentage yield (APY) across compounding frequencies, visualize your savings trajectory,and get a year-by-year breakdown.
A Certificate of Deposit (CD) Calculator helps you project the maturity value of a fixed-term, interest-bearing deposit. By entering your principal, annual interest rate, term, and compounding frequency, you can see exactly how your savings will grow. This tool also computes the Annual Percentage Yield (APY) — the effective annual return that accounts for compounding — so you can compare CDs from different banks on a level playing field.
Whether you are saving for a down payment, building an emergency fund, or diversifying your retirement portfolio, understanding the true yield of a CD is essential. Banks often advertise nominal rates, but the APY tells you what you will actually earn after compounding. Our calculator goes a step further by visualizing your growth trajectory and providing a granular year-by-year breakdown.
Compound Interest Formula
A = P · (1 + r/n)n·t + PMT · [ ((1 + r/n)n·t − 1) / (r/n) ]
Where: A = final amount, P = principal, r = annual rate (decimal), n = compounding periods/year, t = years, PMT = monthly contribution (if any).
Banks advertise their APY prominently because it reflects the true return after compounding. For example, a CD with a nominal rate of 4.25% compounded quarterly has an APY of about 4.32%. That difference may seem small, but over a 5‑year term on a $10,000 deposit, it translates to extra earnings. Our calculator instantly shows the APY so you can make apples‑to‑apples comparisons across institutions.
The Effective Annual Rate (EAR) is mathematically identical to APY when no fees are involved. It is the annualized return you would earn if the interest were compounded once per year at that effective rate. For CDs with monthly or daily compounding, the EAR can be noticeably higher than the nominal rate.
| Scenario | Principal | Rate | Term | Compounding | Final Balance | APY |
|---|---|---|---|---|---|---|
| 5‑Year Standard | $10,000 | 4.25% | 5 yr | Quarterly | $12,352.81 | 4.32% |
| High‑Yield Jumbo | $50,000 | 5.50% | 3 yr | Monthly | $58,958.23 | 5.64% |
| Monthly Saver | $5,000 | 3.75% | 10 yr | Daily | $7,272.48 | 3.82% |
| Short‑Term CD | $8,000 | 2.00% | 1 yr | Annually | $8,160.00 | 2.00% |
| Continuous Compounding | $20,000 | 4.80% | 7 yr | Continuous | $27,985.94 | 4.92% |
Maria, age 62, plans to retire at 65. She has $75,000 in a low‑yield savings account earning 0.50%. She is considering a 3‑year CD at a credit union offering 4.80% APY (nominal 4.70% compounded daily). Using our calculator, she sees that her $75,000 will grow to approximately $86,412 by maturity, earning $11,412 in interest — nearly three times what her savings account would yield. The projected growth chart helps her visualize the trajectory and confirm that the CD aligns with her cash‑flow needs. She also compares the APY (4.82%) against other offers and decides this CD is the best risk‑adjusted return for her time horizon.
Our calculator uses the standard compound interest formula with optional periodic contributions. For monthly additions, we assume the contribution is made at the end of each month and is compounded along with the principal. The formula for the future value of a series of equal payments (an annuity) is added to the compound growth of the initial principal.
For continuous compounding, we use the exponential function: A = P · er·t. This represents the theoretical maximum compounding frequency and is often used in academic finance as a benchmark. The APY for continuous compounding is simply er − 1.
The APY is calculated as (1 + r/n)n − 1, which gives the effective annual return assuming the rate stays constant and no additional deposits or withdrawals occur.