Auto Pay Calculator
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Reviewed by Calculator Editorial Team
Use this Auto Pay Calculator to determine your monthly car payment, total interest paid, and loan terms. Simply enter your loan amount, interest rate, and loan term to get an accurate calculation.
How to Use This Calculator
Using the Auto Pay Calculator is simple. Follow these steps:
- Enter the loan amount (the total amount you're borrowing).
- Enter the annual interest rate (the interest rate on your loan).
- Enter the loan term (the length of your loan in years).
- Click the Calculate button to see your monthly payment, total interest, and total amount paid.
- Use the Reset button to clear all fields and start over.
All calculations are based on the standard auto loan formula. The calculator assumes monthly compounding and does not include any fees or taxes.
Formula Used
The Auto Pay Calculator uses the following formula to calculate your monthly payment:
Monthly Payment Formula
M = P [ i(1 + i)n ] / [ (1 + i)n - 1 ]
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)
The total interest paid is calculated by subtracting the original loan amount from the total amount paid over the life of the loan.
Worked Example
Let's calculate a monthly payment for a $20,000 loan at 4.5% annual interest for 5 years.
- Convert the annual interest rate to a monthly rate: 4.5% ÷ 12 = 0.375% or 0.00375 in decimal form.
- Calculate the number of payments: 5 years × 12 = 60 payments.
- Plug the values into the formula:
M = $20,000 [ 0.00375(1 + 0.00375)60 ] / [ (1 + 0.00375)60 - 1 ]
M = $20,000 [ 0.00375(1.00375)60 ] / [ (1.00375)60 - 1 ]
M ≈ $20,000 [ 0.00375 × 1.239 ] / [ 1.239 - 1 ]
M ≈ $20,000 [ 0.00460625 ] / 0.239
M ≈ $20,000 × 0.019225 / 0.239 ≈ $20,000 × 0.0800 ≈ $1,600
- The monthly payment would be approximately $1,600.
- The total amount paid over 5 years would be $1,600 × 60 = $96,000.
- The total interest paid would be $96,000 - $20,000 = $76,000.
Payment Comparison
Compare different loan scenarios to see how changes in interest rates or loan terms affect your monthly payment.
| Loan Amount | Interest Rate | Loan Term | Monthly Payment | Total Interest |
|---|---|---|---|---|
| $20,000 | 4.5% | 5 years | $1,600 | $76,000 |
| $20,000 | 5.0% | 5 years | $1,650 | $81,000 |
| $20,000 | 4.5% | 4 years | $1,800 | $64,800 |
| $30,000 | 4.5% | 5 years | $2,400 | $112,000 |
Frequently Asked Questions
The Auto Pay Calculator uses standard auto loan formulas and provides accurate results based on the inputs you provide. However, actual payments may vary slightly due to rounding or additional fees.
No, the calculator does not include taxes, fees, or other additional costs associated with auto loans. These should be considered separately when budgeting for your loan.
Yes, you can use this calculator to estimate payments for refinancing by entering the new loan amount, interest rate, and term. However, refinancing may have different terms and conditions than your original loan.
If you want to pay extra each month, you can adjust the loan amount or term in the calculator to see how it affects your payments. Alternatively, you can use an amortization calculator to see how extra payments reduce your loan balance.