The 50 percent rule is the most quoted shortcut in the repair-or-replace debate, and it is really two rules wearing one coat. Used together, they form a single test that settles most decisions in about a minute. This guide states the rule cleanly, runs three worked examples through it, shows where it bends, and finishes with a five-question checklist you can use on any appliance. It is the same thinking that sits behind our wider appliance repair vs replace guide — and it is exactly the logic our repair vs replace calculator runs when you enter your numbers.
The rule, stated cleanly
The cost test: if the repair quote is more than 50% of the price of a comparable new appliance — a similar machine, bought today, not what you paid years ago — replace. Paying more than half the price of new for a repair buys you an old appliance with one new part in it.
The age test: if the appliance has already lived past 50% of its expected lifespan, lean toward replacement even for moderate repairs. The remaining life you are buying with any repair is short, so each repair dollar returns fewer months of service.
Combine them and the rule becomes simple to apply. Pass both tests — a young appliance and a repair under 50% — and repairing is usually right. Fail either test — the appliance is old, or the repair is expensive — and the pointer swings to replacement. Fail both, and it is rarely even close. All the prices in the examples below are typical US figures at around 2025 levels, used to show the proportions; they vary by brand, region and model, so always run the rule with your own real quote and the real price of the replacement you would actually buy.
Three worked examples
Example 1: the fridge that passes on cost and fails on age
A refrigerator needs a $500 repair, and a comparable new fridge costs $1,100. The repair is 45% of the new price, so it passes the cost test — just. But the fridge is 14 years old, against a typical lifespan of roughly 15 years for the purposes of this example, so it has used up over 90% of its life and fails the age test heavily. Verdict: replace. The 45% figure is a trap; it buys perhaps a year or two of an old, energy-hungry machine. Our refrigerator repair vs replace guide shows how the energy gap widens this verdict further.
Example 2: the young washer that passes both tests
A washing machine needs a $300 repair, and a comparable new washer costs $800, so the repair is 38% of new — a clear pass on cost. The machine is 3 years old, against a typical 10–11 year lifespan, so it has used barely a third of its life — a clear pass on age too. Verdict: repair, without much hesitation. This is the case repair budgets exist for.
Example 3: the young dishwasher the cost test still catches
A dishwasher needs a $350 repair, and a comparable new machine costs $600, so the repair is 58% of new — a fail on cost. The machine is only 6 years old, against a 9–13 year lifespan, so it passes on age. Verdict: replace anyway. Youth cannot rescue a repair that costs more than half of new, especially on an appliance whose replacement is inexpensive to begin with. Verdicts like this are worked through in more depth in our dishwasher repair vs replace guide.
Where the rule bends
No rule of thumb survives every kitchen, and this one has four honest exceptions. High-end and built-in appliances: when the replacement price is very high — a built-in fridge, a panel-ready dishwasher, a pro-style range — repairs stay under 50% for years, and replacing also triggers cabinet and fitting costs the rule does not count. Matching sets and panel-ready units: replacing one visible appliance can force you to replace its neighbours to keep the kitchen matching, which quietly multiplies the true cost of new. Appliances under warranty: if the repair is covered, it is free or nearly free, and the rule is simply moot — take the repair. Sudden efficiency jumps: occasionally a new model is not a little better but a generation better — a modern fridge against a pre-2000 one, or a heat-pump dryer against a vented one — and the running-cost saving becomes large enough to move the line. In each case, run the rule first, then adjust for the exception consciously, rather than abandoning the numbers altogether.
The HVAC cousin: the $5,000 rule
Heating and cooling equipment uses a relative of the 50 percent rule called the $5,000 rule: multiply the system’s age in years by the repair cost, and if the result is over $5,000, replacement is usually the better buy. A 12-year-old unit with a $500 repair scores 6,000 — replace. An 8-year-old unit with the same repair scores 4,000 — repair. It is the age test with the volume turned up, built for equipment where repairs grow more expensive as the system ages. If your appliance is an AC or a furnace, the repair vs replace calculator applies this rule alongside the 50 percent rule and shows you both results.
The one-minute decision checklist
Five questions, in order, will settle almost any case:
- Age versus lifespan: how old is it, and what share of its typical life has it used?
- Quote versus new price: what percentage of a comparable new appliance is the repair?
- Repair history: how much have you spent on it in the last two years — and is this becoming a pattern?
- Parts availability: can the part actually be obtained, new, in reasonable time?
- Running-cost gap: how much more does the old appliance cost to run each year than its replacement would?
If the first two answers point the same way, you have your decision. If they conflict, let questions three to five break the tie. And if you would rather not juggle percentages at the kitchen table, the Repair vs Replace Calculator asks for exactly these inputs and returns one clear verdict.
Frequently asked questions
Where did the 50 percent rule come from?
It is a long-standing consumer rule of thumb, passed around by repair technicians, consumer advisers and appliance retailers for decades. It is not an official standard and no regulator set the figure — 50% survives because it is easy to remember and, in practice, lands close to the point where repairs stop paying for most appliances.
Should I use 50% of the original price or the price of a new one?
Always a comparable new one, priced today. The original price is history: models change, prices move, and what you paid ten years ago says nothing about your options now. Compare the quote with the machine you would actually buy if you replaced it today.
Does the rule apply to cars and electronics?
The same logic is used there — compare the repair with the value of replacement, and weigh how much life is left. The thresholds people quote differ, though: cars are often judged against the value of the car itself rather than a new one, and cheap electronics are frequently replaced at far lower repair percentages because replacement is so inexpensive.
What if the repair is exactly at 50%?
Let age decide. A young appliance right at 50% leans repair, because years of life remain to repay the cost. An old appliance right at 50% leans replace, because the same money buys a share of a new machine with its whole life ahead of it. Repair history and parts availability make good tie-breakers after that.