Same math as any fixed-rate loan, applied to a home. Portuguese mortgages commonly offer three rate structures: taxa fixa (fixed for the whole term), taxa variável (indexed to Euribor plus a spread, resetting periodically), and taxa mista (fixed for an initial period, then variable) — the rate you enter here is whichever one applies for the period you're checking.

🇵🇹 Most Portuguese banks cap the mortgage term so it ends before the oldest borrower reaches a certain age (often somewhere between 70 and 80) — that can shorten the maximum term actually available to you below what this calculator alone would let you enter.