Cost Per Use Calculator
Find the real cost of any purchase by spreading its price, maintenance, and resale value over its lifetime uses. Ideal for comparing a cheap item used rarely vs. a pricier one used daily.
Last updated: May 2026
About this calculator
The cost-per-use (CPU) metric reveals the true economic value of a purchase by accounting for every dollar in and out over its life. The formula is: CPU = ((purchasePrice − resaleValue) + (maintenanceCost × usefulLife)) / (expectedUses × usefulLife). The numerator captures your net outlay — what you paid, minus what you'll recover at resale, plus cumulative maintenance. The denominator converts annual usage into total lifetime uses. A $500 item used 200 times per year for 5 years with no maintenance and $50 resale costs only $0.45 per use, far cheaper than a $20 item used twice. This framework is especially powerful when comparing competing products or deciding whether to repair vs. replace.
How to use
Suppose you buy a $300 winter coat, expect to wear it 50 times per year, anticipate $10/year in dry-cleaning, plan to keep it 4 years, and sell it for $50. CPU = ((300 − 50) + (10 × 4)) / (50 × 4) = (250 + 40) / 200 = 290 / 200 = $1.45 per wear. Now compare that to a $80 fast-fashion coat worn 20 times per year for 2 years with no resale value and no maintenance: CPU = ((80 − 0) + (0 × 2)) / (20 × 2) = 80 / 40 = $2.00 per wear. The pricier coat is actually cheaper per use.
Frequently asked questions
How does cost per use help me make better buying decisions?
Cost per use reframes a purchase from a one-time price tag to an ongoing rate, much like a subscription. This makes it easy to compare apples to apples — a $200 appliance used daily can be far more economical than a $40 one used rarely. It also discourages impulse buying by forcing you to estimate realistic usage. Over time, applying CPU thinking naturally shifts spending toward durable, high-use items.
What resale value should I enter if I plan to keep the item forever?
If you never intend to sell the item, enter $0 as the resale value. This means the full purchase price is spread across all uses, giving a slightly higher (but realistic) cost per use. For items like tools or appliances that depreciate to near zero, $0 is almost always the correct input. If the item has collectible or appreciating value — like certain watches — research current resale markets before estimating.
Why does annual maintenance cost matter in the cost-per-use calculation?
Maintenance costs compound significantly over a product's life. A $500 espresso machine with $50/year in descaling tablets and filters over 5 years adds $250 to its true cost — a 50% premium on top of the purchase price. Ignoring maintenance consistently underestimates how much cheap items actually cost, since lower-quality products often require more frequent upkeep. Including maintenance gives a complete picture and often reverses which option appears cheapest.