There is one math problem that will save you more money than any coupon code. It is called cost per wear. And once you start using it, you cannot stop.

The formula is simple: take the price of an item and divide it by the number of times you wear it. That is it. That single number tells you more about value than the price tag ever will.

The Formula

Cost Per Wear = Price / Number of Wears

A $200 pair of boots worn 400 times costs $0.50 per wear. A $60 pair of boots worn 30 times before they fall apart costs $2.00 per wear. The "expensive" boots are four times cheaper.

This is not theory. I have lived it. Let me walk through some real examples.

Boots: The Clearest Example

I own a pair of American-made boots that cost $280. I have worn them roughly 3 days a week for four years. That is about 600 wears. My cost per wear is $0.47.

Before those, I bought cheap boots from a big box store. Around $70. They lasted about 8 months of regular wear. Maybe 100 wears. That is $0.70 per wear. And they looked terrible after month three.

The average American household spends about $1,945 per year on clothing and footwear. i Bureau of Labor Statistics Consumer Expenditure Survey A chunk of that goes to replacing items that did not last. Better initial purchases could shrink that number.

Check out my roundup of the best American-made boots if you want to see what is worth the investment.

Jeans: Where Quality Shows

A pair of $30 fast fashion jeans lasts maybe 6 months of regular wear. The knees blow out. The denim gets thin. Say 50 wears. That is $0.60 per wear.

A pair of $120 selvedge jeans from a quality maker? I have pairs that have lasted 5 years. Worn weekly, that is about 250 wears. Cost per wear: $0.48. And they look better with age. Raw denim develops a fade pattern that is uniquely yours.

I reviewed the best options in my American-made jeans guide. The price tags are higher. The cost per wear is lower.

T-Shirts: A Surprise

Here is where it gets interesting. A $8 basic t-shirt from a fast fashion brand might last 30 washes before it loses shape. That is $0.27 per wear. Not bad.

A $40 American-made t-shirt might last 150 washes. That is also $0.27 per wear. Same cost per wear, but the more expensive shirt stays looking good the entire time. No neck droop. No fading. No pilling.

So with t-shirts, the cost per wear can be similar. The difference is in how you feel wearing it on wear number 100. The cheap one looks like a rag. The quality one still looks sharp. I put together a list of the best American-made t-shirts that hold up wash after wash.

When Cheap Wins

Cost per wear does not always favor the expensive option. And that matters. Here are times when cheap is the right call:

Trend pieces. Something you will wear for one season and move on from. A trendy jacket or a seasonal color. Buy cheap, wear it, donate it.

Workout clothes. They get sweaty, stretched, and worn out fast regardless of quality. A $12 gym shirt serves the same purpose as a $50 one.

Special occasion items. A Hawaiian shirt for a themed party. A costume piece. If you will wear it once or twice, the formula says go cheap.

Kids clothes. They grow out of them before the clothes wear out. I have two kids. Trust me on this one.

How to Use This in Real Life

Before you buy something, ask yourself two questions:

How many times will I realistically wear this? Be honest. Not how many times you hope to wear it. How many times you actually will.

How long will it physically last? Check the materials. Check the construction. Check reviews from people who have owned it for years, not days.

Then do the math. It takes three seconds. Price divided by expected wears. Compare that number to the alternatives.

The Hidden Benefits

Cost per wear is not just about money. It changes your relationship with your stuff.

When you invest in fewer, better things, you take care of them. You condition your leather boots. You hang your jeans to dry. You repair a loose seam instead of tossing the whole shirt. This is the philosophy behind buying less and buying better.

The average American throws away about 81 pounds of textiles per year. i EPA Textiles Data Cost per wear thinking reduces that. Not because you are trying to save the planet with every purchase. But because you are buying things that last, which means less waste by default.

The Rule of Thumb

Here is my personal rule: if I will wear something more than 100 times, I buy the best I can afford. If I will wear it fewer than 10 times, I buy the cheapest option that works. Everything in between is a judgment call.

That rule has simplified my shopping. It has saved me money. And my closet is smaller, better, and full of things I actually like.

Do the math. It is the only shopping formula you need.