Estimate the maturity value and interest of a share certificate (a credit union CD).
This calculator finds the maturity value and total interest of a credit union share certificate compounded at its stated APY.
A share certificate is a credit union's version of a bank certificate of deposit, paying a fixed rate in exchange for locking your deposit for a set term. Because the annual percentage yield already reflects compounding, this tool applies the APY over the term to project the ending balance. Longer terms and higher APYs both increase the interest you earn.
The calculator shows your final maturity value and the interest earned on top of your original deposit. This helps you compare certificates with different terms or rates on equal footing. It does not account for early-withdrawal penalties, which can reduce or erase interest if you cash out before maturity.
They work the same way, but a share certificate is offered by a credit union and a CD is offered by a bank. The term reflects the credit union model of members holding shares.
The rate is fixed for the term, and most certificates are insured up to federal limits by the NCUA. Your projected interest assumes you hold the certificate to maturity.
Most credit unions charge an early-withdrawal penalty, often several months of interest. This calculator does not include that penalty, so early withdrawal would leave you with less than shown.
See the exact formula and a worked example on our methodology page.