An easy and straightforward way to calculate the amount earned with an annual compound interest is using the formula to increase a number by percentage: =Amount (1 + %) . In our example, the formula is =A2(1+$B2) where A2 is your initial deposit and B2 is the annual interest rate.
Amortization and compound interest are two different ways to calculate interest. Amortization is usually for medium-term financings, such as auto loans. Compound interest is typically for much longer loans, like a 30-year mortgage (it's also possible to get an amortizing or simple interest mortgage).