Navy Federal Auto.loan Calculator

How to Use This Calculator

To use the Navy Federal Auto Loan Calculator:

1. Enter the loan amount you're considering
2. Select the loan term in years
3. Enter the interest rate (Navy Federal's current rate or your negotiated rate)
4. Click "Calculate" to see your estimated monthly payment and total interest

The calculator will display your estimated monthly payment, total interest paid over the life of the loan, and a breakdown of how much goes toward principal versus interest.

Formula Used

The calculator uses the standard auto loan payment formula:

Where:

• M = Monthly payment
• P = Principal loan amount
• i = Monthly interest rate (annual rate divided by 12)
• n = Number of payments (loan term in years multiplied by 12)

Total interest is calculated as:

Worked Example

Let's calculate a $25,000 auto loan with a 4.5% interest rate over 5 years (60 months):

1. Monthly interest rate = 4.5% ÷ 12 = 0.375% or 0.00375
2. Using the formula: M = $25,000 [ 0.00375(1 + 0.00375)^60 ] / [ (1 + 0.00375)^60 - 1 ]
3. Calculating the numerator: 0.00375 × (1.00375)^60 ≈ 0.2653
4. Calculating the denominator: (1.00375)^60 - 1 ≈ 0.2653
5. Monthly payment ≈ $25,000 × (0.2653 / 0.2653) ≈ $432.87
6. Total interest = ($432.87 × 60) - $25,000 ≈ $2,612.20

This example shows that with a $25,000 loan at 4.5% over 5 years, you would pay approximately $432.87 per month with $2,612.20 going toward interest.