Cost Per Use vs Cost Per Day
Two different ways to measure purchase value over time, and when each one makes sense.
The core distinction
Cost per day spreads price across calendar days of ownership. Cost per use spreads price across actual usage events.
When cost per day works best
Many possessions provide value continuously or passively, such as furniture, mattresses, winter coats, and everyday shoes.
When cost per use works best
Some items stay stored away until a specific trip or project, such as luggage, specialized tools, and camping gear.
Where each metric can mislead
Cost per day can hide forgotten items in closets. Cost per use requires manual logging that can feel like a chore.
Using both metrics together
Neither metric is universally superior. Use cost per day for continuous belongings, and consider use frequency for occasional gear.