The 50% Rule: When to Repair vs. Replace Any Home Appliance

What Is the 50% Rule?

The 50% Rule states: if the cost to repair your appliance exceeds 50% of the cost to replace it with a new equivalent unit, replacement is the smarter financial decision.

The logic is straightforward. A repair that costs more than half the price of a new appliance delivers poor return on investment — especially when the repaired appliance is aging and likely to require additional repairs in the future.

Example: Your washing machine needs a new control board. The repair estimate is $450. A comparable new washer costs $799. The repair represents 56% of replacement cost — the 50% Rule says replace.

That is a reasonable conclusion. But notice what the rule does not consider: the age of the washer. A 2-year-old washer needing a $450 repair is a very different financial situation than a 9-year-old washer needing the same repair. The 50% Rule treats them identically.

Where the 50% Rule Works

The rule is most reliable in these scenarios:

When the appliance is mid-to-late life. If your appliance is already 7-10 years old and a repair crosses the 50% threshold, the combination of age and cost makes replacement the clear choice.

When the repair is for a known failure-prone component. Compressors, control boards, and bearings are expensive to repair and statistically likely to be followed by additional failures.

When you are comparing against current retail pricing. The rule only works if your replacement MSRP is accurate. Using a 5-year-old purchase price instead of today's retail price produces a misleading result.

Where the 50% Rule Breaks Down

It ignores appliance age entirely. A brand new refrigerator with a $400 compressor issue on a $799 unit hits 50% — but replacing a 1-year-old refrigerator makes no financial sense.

It ignores local labor rates. A $450 repair estimate in San Francisco includes $165/hr labor. The same repair in Oklahoma City at $95/hr might cost $280. The 50% Rule uses whatever number your technician quotes — which varies by 40% or more depending on your market.

It ignores parts availability. A repair that crosses the 50% threshold because parts are backordered 6 weeks is a different decision than the same repair with parts available same-day.

It produces a binary answer. Repair or replace. No middle ground, no context. Real decisions are rarely that clean.

The 50% Rule in Practice — A Market Comparison

When to Use the AM Score Instead

The 50% Rule is a useful first filter. The ApplianceMath Score is what you use when you need a precise answer. The AM Score factors in everything the 50% Rule ignores: your specific local labor rate, your appliance's age relative to its category-specific expected lifespan, current parts availability, and the actual repair cost for your specific failure type.

Use the 50% Rule when: you need a fast directional answer before calling a technician.

Use the AM Score when: you need a precise, localized recommendation before spending money.

The 50% Rule by Appliance Category