The Loan Calculator is a simple Python-based application that allows users to calculate the monthly payment, total payment, and total interest paid for a loan. It provides a user-friendly interface for entering loan details such as the annual interest rate, loan amount, loan term, extra payments, extra payment frequency, and start date.

Calculate the monthly payment based on the loan amount, annual interest rate, and loan term. Estimate the total payment over the loan term, including principal and interest. Determine the total interest paid on the loan. Account for extra payments made during the loan term to calculate an adjusted total payment and interest.

Enter the annual interest rate as a percentage. Specify the number of years for the loan term. Provide the loan amount. Optionally, add any extra payments made during the loan term and specify the extra payment frequency. Enter the start date of the loan repayment. Click the "Calculate" button to see the results.