How to calculate cost per use

The basic cost-per-use formula

Cost per use helps compare items with different prices and lifespans. A cheaper product can cost more over time if it wears out quickly, while an expensive item may provide better value when used often.

Estimate uses honestly. Buying a $200 appliance does not create value if it stays in a cabinet after three uses.

Include more than the purchase price

Total ownership cost can include required accessories, replacement parts, cleaning supplies, subscription fees, or expected maintenance. Do not include costs that are identical for every option, because they will not change the comparison.

For example, a $90 printer that requires $180 of ink over its useful life has a larger real cost than the shelf price suggests.

Compare two options

Suppose a $40 pair of shoes lasts for 80 wears, while a $90 pair lasts for 300 wears. The first pair costs $0.50 per wear. The second costs $0.30 per wear, making it less expensive over its useful life despite the higher initial price.

Cost per use is only one factor. Comfort, reliability, environmental impact, and the cash you can afford to spend now may matter just as much.

Use a realistic range

When the number of uses is uncertain, calculate a low and high estimate. If you expect to use an item between 40 and 80 times, show both results. This prevents an optimistic guess from making every purchase look economical.

• Use past behavior to estimate frequency.
• Include likely repair and supply costs.
• Compare products over the same time period.
• Recalculate after several months to improve future estimates.