Compound interest rate formula is a key concept in forex trading. It is the basis for understanding how your investments will grow over time and is critical to making long-term trading decisions. The formula is simple: the interest you earn on an initial investment is added to your starting amount and the sum is reinvested to be costed again. This subsequent compounded amount can be calculated by using a simple formula, which is often represented as A = P (1 + r/n) ^ (n*t). In this equation, A is the amount after compounding, P is the principal amount invested, r is the interest rate, n is the number of times the interest is compounded per time period, and t is the number of time periods. With this formula, traders can accurately assess the effects of compounding their investments over time.