Question: how to calculate compound interest savings account?
Answer: Extra Steps for Compounding Scenarios To change this annual rate to a monthly rate, divide 5% by 12 months (0.05 ÷ 12) to get 0.004167. Next, increase the number of periods to 12. To calculate monthly compounding over multiple years, you'd use 12 periods per year. For example, four years would be 48 periods.