Compound Interest Calculator

See how an investment or savings account grows over time with compound interest using the formula A = P(1 + r/n)^(nt). Enter your principal (starting amount), annual interest rate, time horizon in years, and compounding frequency — annually, semi-annually, quarterly, monthly, or daily. The calculator shows both the final amount and the total interest earned, with a full step-by-step breakdown of the formula substitution so you can follow along in your finance or pre-calculus coursework.