CD Calculator

A certificate of deposit is the boring end of investing, and that is the point. You hand a bank a fixed sum for a fixed term at a fixed rate, and you get a known amount back at maturity. In exchange for locking the money away you usually earn more than a regular savings account pays, which is the whole trade. The mechanics are simple. Interest is calculated on the deposit at the stated rate, compounded on a schedule the bank sets, and paid or accrued until the term ends. Because compounding adds interest to the balance, the value at maturity is slightly more than the deposit multiplied by the rate and the years — the difference grows with the term and the rate. The APY is the number to compare. Two CDs might quote the same nominal rate but compound differently, and the one that compounds more often will pay a little more. Because CDs of the same term are easy to compare, the annual percentage yield exists to make that comparison honest, and it is the figure the bank is required to disclose. The catch is liquidity. Withdrawing early usually costs a penalty of several months of interest, and in some cases part of the principal, which can wipe out the gain entirely. That makes a CD a poor home for money you might need soon. It suits funds you can genuinely leave untouched for the whole term, or that you have laddered so that a portion matures each year. Rising-rate environments add a second risk: a long CD locks in today's rate, and if rates climb afterwards, you are stuck earning less than the market offers. This calculator shows the maturity value, the interest earned and the effective annual yield for the term you enter, and compares it with simple interest so you can see what compounding adds. It assumes the rate is fixed and no penalty applies; check the specific terms before you commit, since early-withdrawal rules vary widely.

This calculator returns estimates for general information only. It is not financial, investment, tax or legal advice, and it cannot replace guidance from a qualified professional who knows your circumstances. Figures such as loan payments, investment growth and retirement projections are simplified models based on the inputs and assumptions you provide, not guarantees of future results.