The 50% rule for repair vs replace — and the smarter version of it

Something just broke, a technician quoted a number, and now you’re doing math in your head: is this worth fixing, or am I throwing money at a dying machine? There’s a rule for that — and a better version of it most people never hear.

The basic rule: half the price of new

The most-repeated guideline in appliance repair is the 50% rule: if fixing the appliance costs more than half what a comparable new one costs, replace it. A $400 oven isn’t worth a $250 repair; a $1,800 refrigerator may well be worth a $400 one.

Compare against the real replacement cost, not just the sticker price — delivery, installation, haul-away, taxes, and any built-in cabinetry work all belong in that number, and they can shift the math.

It works because a big repair on an aging machine is really a bet — that nothing else fails soon after. The closer the repair creeps toward half the replacement price, the worse that bet looks.

The smarter version: add age

The rule sharpens when you weigh how much life the unit had left. Finance writers and trades pros land in the same place: as NerdWallet puts it via Angi’s Angie Hicks, replace when the appliance is “halfway through its useful life — and most last between 10 to 15 years — and it’s going to take half as much to repair it than to replace it.”

So you need a feel for the lifespan. Home inspectors use InterNACHI’s life-expectancy chart; the rough numbers:

A failed control board at year 3 is worth fixing; the same board at year 12 on a 13-year machine usually isn’t.

For energy hogs, add running cost

With refrigerators, water heaters, and other big energy users, the repair price isn’t the whole cost. The U.S. Department of Energy notes an old refrigerator uses about 35% more energy than an ENERGY STAR model, and a new certified one saves more than $220 over its lifetime. A cheap fix that keeps a power-hungry unit alive can quietly cost you more than replacing it would.

That doesn’t mean every old fridge should go. But when a unit is also near the end of its life, has needed repeat repairs, or runs hot on power, its operating cost belongs in the decision.

Check warranty and recalls first — it might be free

Before any of this math, run two free checks. First, coverage: an original manufacturer warranty, a retailer protection plan, a separate extended warranty or home warranty, or a credit-card extended-warranty benefit can all make a repair cost little or nothing — so confirm before you pay. Second, recalls: if your model has an open recall, the remedy may be a free repair, a replacement, or a refund, and it applies regardless of the unit’s age. Check the model number against the manufacturer and the U.S. Consumer Product Safety Commission’s recall list, and follow their instructions.

The exceptions

• High-end or built-in units. A premium appliance built to outlast the averages, or a custom built-in with steep install costs, tilts toward repair.
• Repeat repairs. A unit you’ve already fixed two or three times is telling you something — stop feeding it.
• Safety. A gas smell, a burning smell, scorched or sparking wiring, or a breaker that keeps tripping isn’t a math problem — stop using the appliance and call a qualified pro.

Where the rule breaks down — and OwnWise comes in

Every version of the 50% rule needs two numbers you usually don’t have at the moment of decision: what actually failed, and what the fix should fairly cost. A service call reveals those only after you’ve paid a trip fee and a tech is already standing in your kitchen — which is exactly when it’s hardest to say no.

OwnWise gives you both up front. Describe the symptom and it identifies the likely fault, estimates a fair repair price, and weighs that against your appliance’s age, type, and running cost — then flags any warranty or recall that should cover it. It’s not a substitute for a qualified technician — it’s how you walk into the repair-or-replace call already knowing which side of 50% you’re on.

Before you decide

The prices, lifespans, and energy figures here are typical ranges, not guarantees — your model, local labor rates, and how the unit’s been maintained all move the numbers. Use the rule to frame the call, and your specific quote and the appliance’s age to make it.