Above is a basic loan repayment amount calculator. This can be used to calculate an average indicative repayment amount for any principal and interest loan.
The reason that the rates are indicative is because that interest rates are typically subject to change. For a more conservative estimate, you can try increasing the rate by a little bit.
Example: the bank offers you a loan at 4%. You could increase your calculation to include a 7% interest rate to account for periods when interest rates are a little bit higher, which would make a more conservative estimate.
Note: Such a sensitivity analysis will also show you just how much lending interest rates matter for your budget.