Calculating Interest for a Private Loan

[jayicod]

Hi everyone,

a close friend of mine asked to borrow some money to help jumpstart his new organic catering business, and we agreed on a small interest rate for the duration of the loan.

To keep our friendship professional and transparent, I need to find a very precise method to calcular período entre datas so that the final repayment amount is fair for both of us.

I want to make sure I am doing the math correctly to avoid any awkward conversations about money down the line. Does anyone have a reliable template for this type of calculation?

Thanks in advance.