Tdecu Auto Loan Calculator
'/%3E%3Ccircle cx='48' cy='39' r='19' fill='%23f2c9a5'/%3E%3Cpath d='M27 35c3-16 39-17 42 2-8-8-27-9-42-2z' fill='%23374151'/%3E%3Cpath d='M21 86c5-24 49-28 56 0z' fill='%232563eb'/%3E%3Ccircle cx='41' cy='41' r='2' fill='%23111827'/%3E%3Ccircle cx='55' cy='41' r='2' fill='%23111827'/%3E%3Cpath d='M42 52c4 3 9 3 13 0' stroke='%2392400e' stroke-width='3' fill='none' stroke-linecap='round'/%3E%3C/svg%3E)
Reviewed by Calculator Editorial Team
Use this TDECU Auto Loan Calculator to estimate your monthly payments, total interest, and loan cost. The calculator uses standard auto loan formulas to provide accurate results based on your loan amount, interest rate, and term.
How to Use This Calculator
Enter your loan details in the calculator panel on the right. The required fields are:
- Loan amount (the total amount you want to borrow)
- Interest rate (annual percentage rate)
- Loan term (length of the loan in years)
Click "Calculate" to see your estimated monthly payment, total interest paid, and total cost of the loan. The calculator will also display a payment breakdown chart.
You can reset the form at any time using the "Reset" button.
Formula Used
The calculator uses the standard auto loan payment formula:
Monthly Payment = P × (r(1 + r)^n) / ((1 + r)^n - 1)
Where:
- P = Principal loan amount
- r = Monthly interest rate (annual rate divided by 12)
- n = Number of payments (loan term in years × 12)
Total Interest = (Monthly Payment × n) - P
Total Cost = Monthly Payment × n
Worked Example
Let's calculate a $25,000 loan with a 4.5% annual interest rate over 5 years:
- Convert annual rate to monthly: 4.5% ÷ 12 = 0.375% or 0.00375
- Number of payments: 5 years × 12 = 60 months
- Monthly payment = $25,000 × (0.00375(1 + 0.00375)^60) / ((1 + 0.00375)^60 - 1) ≈ $472.88
- Total interest = ($472.88 × 60) - $25,000 ≈ $1,973.68
- Total cost = $472.88 × 60 ≈ $26,973.68
This example shows that a $25,000 loan at 4.5% over 5 years would cost approximately $26,973.68 with $1,973.68 in interest.