The tag says $150. But you’re not buying a price — you’re buying the uses you’ll get out of it. Dividing what something truly costs by how many times you’ll use it — the cost per use — regularly flips the tag’s verdict: the “expensive” item turns out to be the bargain, and the “cheap” one the costlier of the two.
How it works
Three numbers: what it costs (purchase plus any yearly upkeep), how long it will last, how often you’ll use it.
cost per use = (price + upkeep × years) / (uses per week × 52 × years)
The calculator runs it twice — once for the item you’re eyeing, once for a cheaper alternative under the same usage. The last line, the uses needed to beat the alternative, tells you how much actual use the quality option needs before it pays for itself.
A worked example
A quality $150 coat worn once a week for four winters: 208 wears, 72 cents per wear. The $40 alternative that’s done after one winter: 52 wears, 77 cents per wear. The “expensive” coat costs less every single time you put it on — and covering the same four years with cheap coats means buying four of them: $160, more than the good one cost. Break-even lands at 195 wears, just under four years: if the good coat survives to there, it won.
It doesn’t always end that way, and that’s the point of doing the math: if you’ll use the thing rarely, cheap wins. A formal jacket for two weddings a year almost never repays the quality version. Per-use doesn’t root for luxury — it roots for usage.
The mental correction
Your brain judges “expensive” and “cheap” by the purchase price, because that’s the only number visible at the till. It’s the mirror image of the small-frequent-spending trap: a big rare cost looks huge, but spread over its uses it can be tiny. Ramit Sethi’s conscious spending idea says exactly this — spend happily where your usage is intense, cut without mercy where it isn’t. The official MyMoney.gov advice is the same in plainer clothes: compare prices and quality, not prices alone.
Things to keep in mind
- Lifespan is an assumption. Nobody knows how many years a pair of boots will live. Use cautious estimates and try several — if the verdict holds even on the pessimistic lifespan, it’s solid.
- Subscriptions are the extreme case. Zero purchase price, yearly upkeep, and the per-visit cost is set by your consistency — try the gym above at 3 visits a week, then at 1.
- Per-use isn’t everything. Comfort, safety, the pleasure of using something well made don’t fit in the formula. The formula does one job: it stops the price tag from making the decision for you.
To price a purchase in hours of your life, there’s the real hourly wage calculator; for costs that repeat, the cost of a habit. Meanwhile, try changing just the cheap alternative’s lifespan above — it’s the number that flips the most verdicts.