A $2,400 transmission quote on a car worth $5,000 feels like a no-brainer to walk away from — but the math often says otherwise, because the alternative isn’t “free”: it’s a new monthly payment, higher insurance, tax and fees. This calculator compares the real monthly cost of fixing your current car against replacing it, using the same two-year horizon mechanics use.
Repair or Replace Calculator
The rule mechanics actually use
Most shop owners use two thresholds. First, if one repair costs more than half of what the car is worth, it’s usually time to let it go. Second, compare the repair against twelve months of payments on a replacement: a $2,400 repair is less than a year of $350 payments, so if the car is otherwise sound, the repair wins. The calculator above goes a step further and adds what people forget — the new car’s depreciation (the biggest cost of all), loan interest, sales tax and the jump in insurance when you move from liability-only to full coverage on a financed car.
Signs the car is worth saving
- The problem is a single component (alternator, AC compressor, brakes, a sensor) rather than a pattern of failures.
- No rust in the frame, subframe or brake lines — rust is the one thing that isn’t economical to fix.
- Engine and transmission are healthy, or the repair in question is the transmission and the rest of the car is clean.
- You’ve kept up with oil changes and the model has a reputation for 200,000+ miles (Toyota, Honda, many Fords and GM trucks).
For the full decision guide, including what to do when the repair is a transmission or engine, read Is It Worth Fixing an Old Car?. If you’re leaning toward replacing, run the numbers in our car affordability calculator first.