Reading a loan offer like a lender
Every fixed-rate loan — personal, auto, or student — runs on the same three dials: the amount, the APR, and the term. Lenders know most borrowers only look at the monthly payment, so the classic move is to stretch the term until the payment looks comfortable. The payment shrinks; the total interest balloons. The calculator above shows both numbers side by side, which is exactly the comparison the offer letter hopes you won't make.
A "lower monthly payment" is often just the same debt, wearing a longer coat.The Ledger
The term trap, in numbers
A $20,000 auto loan at 9.5% APR:
| Term | Monthly payment | Total interest |
|---|---|---|
| 36 months | $641 | $3,064 |
| 60 months | $420 | $5,207 |
| 84 months | $327 | $7,449 |
Going from 36 to 84 months cuts the payment in half — and multiplies the interest by 2.4×. On a depreciating asset like a car, long terms also raise the odds of being "underwater": owing more than the car is worth.
APR vs. interest rate
The interest rate is what the lender charges on the balance. The APR adds origination fees and other mandatory costs, expressed as a yearly percentage — which makes it the only fair way to compare two offers. A loan advertised at 8.9% with a 5% origination fee can easily have a higher APR than a "10.5%" loan with no fees. When in doubt, compare APRs and totals, never headline rates.
Three questions before you sign
1. Is there a prepayment penalty? Most personal and auto loans allow free early payoff, but always confirm. Extra principal payments are the cheapest interest-killer available. 2. Is the rate fixed or variable? This calculator models fixed rates; variable rates can rise. 3. Could you consolidate instead? If you're borrowing to pay off cards, read our debt consolidation guide first — the math only works under specific conditions.
Borrowing to invest in your future instead? See what the same monthly amount would grow into with the compound interest calculator.