Repair or Replace Calculator
You've got a repair quote and a decision to make. Enter four numbers and get a clear verdict on whether fixing your car is worth the money — with the reasoning shown, not hidden.
Your numbers
Nothing is stored or sent anywhere — the maths runs in your browser.
Your verdict appears here
Fill in the four figures on the left and we'll weigh them up.
Now find a mechanic near you
An estimate is only half the job. Hidden Mechanics connects you with trustworthy, home-based mechanics who charge less than a dealership — and it's completely free for customers to search.
Is it worth fixing your car?
Every driver eventually gets the phone call: the repair is going to cost more than the car feels like it's worth. The instinct is to reach for a simple rule — the old 50% guideline says replace the car if the repair costs more than half its value — but that rule throws away most of the information that actually matters. This calculator weighs four things instead: the repair relative to the car's value, how many miles are realistically left, the car's age, and what replacing it would genuinely cost you each month.
Repair cost against car value
This is the biggest single factor, and the thresholds are worth knowing. Under 30% of the car's value, repairing almost always wins. Between 30% and 50% it's a reasonable spend on a car with life left in it. Past 50% you're committing a large share of the asset to keep it running, and past 80% you are effectively buying the car again. Use the private-party value from Kelley Blue Book, not the trade-in number — trade-in figures are deliberately conservative and will push you toward replacing prematurely.
The number most people forget
A repair is a one-off. A replacement is a payment every month for years. A $2,800 transmission job looks brutal until you notice it's about six months of payments on a $450-a-month replacement — and then the payments keep going for another fifty-four months while the repair is finished. Spreading the repair across the miles you have left is the honest comparison: under about five cents per remaining mile is cheap motoring by any standard.
What no calculator can weigh
Some things fall outside the arithmetic. Structural rust and flood damage make a car a poor bet at any repair price. A car that has needed three unrelated expensive repairs in a year is telling you something the fourth quote won't. And if the repair still leaves you with a vehicle you don't trust for a long drive, the money hasn't bought what you needed. Treat the verdict here as a well-reasoned starting point, then apply what you know about your own car.
Before you accept any quote, check it against typical pricing with the car repair cost estimator— an unfair quote is a much more common problem than a car that's genuinely finished. If the repair follows a warning light, the check engine code lookup may reveal a cheaper root cause. And if you decide to keep the car, the maintenance schedule checker will help you avoid the next surprise. For a second opinion, find a mechanic near you— it's free to search.
Frequently asked questions
Sometimes, yes — and this is where the common advice goes wrong. If a $3,000 repair on a $2,500 car buys you three more years of reliable driving, it can still beat $450 a month on a replacement. The real question isn't repair cost versus car value, it's cost per remaining mile versus the cost of the alternative. Where it stops making sense is when the car needs more big repairs soon after, which is why mileage and age matter as much as the quote.
The rule of thumb is that if a repair costs more than 50% of the car's current value, you should think seriously about replacing it. It's a useful starting point but it's blunt: it ignores how many miles the car has left, whether the repair is a one-off or the first of several, and what replacing it would actually cost you. A 50%-of-value repair on a well-maintained 90,000-mile car is a very different decision from the same repair on a rusty 210,000-mile one.
Use the private-party value from Kelley Blue Book or Edmunds, not the trade-in figure — trade-in values are deliberately low and will skew the calculation toward replacing. Enter your car's real condition rather than the flattering option, and factor in whether it currently drives. A car that needs the repair to be roadworthy is worth substantially less than the same car in running order.
A few situations make the decision easy regardless of the numbers. Structural rust on the frame or subframe is a safety issue and rarely economical to fix. Flood damage causes electrical faults that surface for years afterward. A blown engine or failed transmission on a high-mileage car usually costs more than the car is worth and often signals that other major components are close behind. And if the repair leaves you with a vehicle you still don't trust to start in the morning, that's a real cost too.
Almost always. Repair quotes for the same fault vary by hundreds of dollars, and diagnoses vary too — 'you need a new transmission' sometimes turns out to be a solenoid or low fluid. Before you write a car off on the strength of one quote, check the number against typical pricing and get a second mechanic to look at it. A quote that's badly out of line is a far more common problem than a car that's genuinely finished.
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