Line of Credit Calculator

Line of Credit Calculator

Manage your revolving credit and calculate monthly costs

Usually 1% to 3% of the outstanding balance.

Results Summary

Total Outstanding Balance:

Remaining Available Credit:

Est. Monthly Interest Cost:

Min. Monthly Payment:

Understanding Your Line of Credit (LOC)

A Line of Credit (LOC) is a flexible, revolving credit arrangement provided by financial institutions. Unlike a traditional loan where you receive a lump sum and pay it back over a fixed term, an LOC allows you to borrow up to a certain limit, repay it, and borrow again as needed.

How Interest is Calculated

Interest on a line of credit is typically calculated on the average daily balance. This means the more frequently you pay down the balance, the less interest you accrue. Most LOCs feature variable interest rates tied to a benchmark like the Prime Rate.

Revolving Credit vs. Installment Loans

  • Flexibility: You only pay interest on what you actually borrow, not the entire limit.
  • Repayment: Monthly payments are often flexible, requiring only a small percentage of the balance or interest-only payments.
  • Reusability: As you pay back the principal, your available credit increases automatically.

Practical Example

Imagine you have a $15,000 credit limit with an 8% APR. If your current balance is $5,000 and you draw an additional $2,000:

  • New Balance: $7,000
  • Available Credit: $8,000
  • Approximate Monthly Interest: ($7,000 * 0.08) / 12 = $46.67
  • Minimum Payment (at 2%): $140.00

Key Terms to Know

Draw Period: The timeframe during which you can actively withdraw funds from the LOC.

Utilization Ratio: The percentage of your credit limit currently being used. Keeping this below 30% is generally better for your credit score.

function calculateLOC() { var limit = parseFloat(document.getElementById('creditLimit').value); var balance = parseFloat(document.getElementById('currentBalance').value) || 0; var draw = parseFloat(document.getElementById('drawAmount').value) || 0; var apr = parseFloat(document.getElementById('annualRate').value); var minPayPercent = parseFloat(document.getElementById('minPaymentPercent').value); var warning = document.getElementById('warningMsg'); warning.style.display = 'none'; if (isNaN(limit) || isNaN(apr) || isNaN(minPayPercent)) { alert('Please fill in all required fields with valid numbers.'); return; } var totalBalance = balance + draw; var available = limit – totalBalance; // Monthly Interest Calculation (Simple monthly approximation) var monthlyInterest = (totalBalance * (apr / 100)) / 12; // Minimum payment: often a percentage of the balance OR interest only, // but usually balance-based in revolving accounts. var minPayment = totalBalance * (minPayPercent / 100); // If the balance exceeds the limit if (totalBalance > limit) { warning.innerHTML = "Warning: Your total balance exceeds your credit limit by $" + (totalBalance – limit).toFixed(2); warning.style.display = 'block'; } // Update UI document.getElementById('resTotalBalance').innerText = '$' + totalBalance.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('resAvailable').innerText = '$' + Math.max(0, available).toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('resMonthlyInterest').innerText = '$' + monthlyInterest.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('resMinPayment').innerText = '$' + minPayment.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('locResult').style.display = 'block'; }

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