let amortizationSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateAmortization(){ amortizationSteps=””; const loanAmount=parseFloat(document.getElementById(“loanAmount”).value); const interestRate=parseFloat(document.getElementById(“interestRate”).value)/100/12; const loanTerm=parseFloat(document.getElementById(“loanTerm”).value)*12; const extraPayment=parseFloat(document.getElementById(“extraPayment”).value); if(isNaN(loanAmount)||isNaN(interestRate)||isNaN(loanTerm)||isNaN(extraPayment)||loanAmount<=0){ alert("Please enter valid positive values for all fields."); return; } const monthlyPayment = (loanAmount * interestRate) / (1 – Math.pow(1 + interestRate, -loanTerm)); const totalPayment = monthlyPayment * loanTerm; const totalInterest = totalPayment – loanAmount; const totalPaidWithExtra = (monthlyPayment + extraPayment) * loanTerm; const monthsSaved = (totalPaidWithExtra – loanAmount) / (monthlyPayment + extraPayment); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); document.getElementById("totalInterest").value = formatCurrency(totalInterest); document.getElementById("loanTermAfterExtra").value = monthsSaved.toFixed(0); amortizationSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Interest Rate: ${(interestRate*100*12).toFixed(2)}%
Term: ${loanTerm/12} years
Extra Payment: ${formatCurrency(extraPayment)}

`; amortizationSteps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
Total Interest: ${formatCurrency(totalInterest)}
Term After Extra Payments: ${monthsSaved.toFixed(0)} months
`; amortizationSteps += `Tip: Extra payments can drastically reduce your loan term and interest paid over time. Consider making additional payments whenever possible.`; if(document.getElementById(“calculationStepsAmortization”).style.display===”block”){ document.getElementById(“calculationStepsAmortization”).innerHTML = amortizationSteps; } } function resetAmortization(){ document.querySelectorAll(“#calculator input”).forEach(el=>el.value=””); amortizationSteps=””; document.getElementById(“calculationStepsAmortization”).innerHTML=”

Not calculated yet.

“; } function toggleAmortizationSteps(){ const s=document.getElementById(“calculationStepsAmortization”); const a=document.getElementById(“toggleArrowAmortization”); if(s.style.display===”none”||s.style.display===””){ s.style.display=”block”;a.style.transform=”rotate(180deg)”; s.innerHTML=amortizationSteps||”

Not calculated yet.

“; }else{s.style.display=”none”;a.style.transform=”rotate(0deg)”;} } function formatCurrency(n){return currencySymbol+n.toFixed(2)+” “+fixedCurrency;}