Calculating compound interest rate (Tính lãi kép) involves several steps to determine the growth of an investment or debt over time. First, identify the initial principal amount, which is the starting balance or loan amount. Next, determine the annual interest rate, expressed as a percentage, that will be applied to the principal. Then, ascertain the compounding frequency, whether interest is compounded annually, semi-annually, quarterly, monthly, or continuously. Afterward, calculate the number of compounding periods, which is the total number of times interest will be compounded over the given time frame. Finally, use the compound interest formula, which incorporates these variables, to compute the final amount or balance after the specified period. Alternatively, utilize online compound interest calculators or spreadsheet software to streamline the calculation process for convenience and accuracy.