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HoldingCost

Cost per use calculator

Work out the true per-use cost of a purchase by factoring in upfront cost, ongoing fees, resale value, and usage.

Calculator personal

Logic updated April 2026

This calculator computes the true per-use cost of any item or subscription by dividing total cost of ownership by total uses over the time you'll own it. It's the metric that reveals whether a $300 jacket worn 200 times is a smarter buy than a $50 jacket worn twice — counter-intuitive answers happen often.

How this is calculated

Formula 

TCO = totalCost + ongoingMonthly × months − resaleValue ; uses = usesPerWeek × months × (52 / 12) ; costPerUse = TCO / uses

Step-by-step

  1. Calculate total ongoing cost: monthly cost multiplied by ownership months
  2. Calculate total cost of ownership: purchase price + total ongoing cost − expected resale value
  3. Convert ownership months to weeks (multiply by 52/12 ≈ 4.33)
  4. Calculate total uses: uses per week × total weeks
  5. Divide TCO by total uses to get cost per use
  6. Calculate cost per month and cost per year for budget comparisons across alternative items
Rounding mode
ROUND_HALF_UP
Precision
20-digit internal precision (Decimal.js), rounded to 2 decimal places for display
Logic last reviewed

Assumptions & limitations

What this calculator assumes

  • Total uses derived as uses per week × ownership months × (52 ÷ 12)
  • Total cost of ownership = purchase + ongoing monthly × months − resale value
  • Cost per use can be negative when resale value exceeds total spending
  • isWorthIt is a heuristic flag (true when cost per use is below $5)
  • Break-even uses is the count required to drive cost per use below $1

What this calculator doesn’t account for

  • Doesn't capture quality differences between cheap and premium options
  • Doesn't model usage patterns that change over time (initial enthusiasm, then less use)
  • Doesn't include opportunity cost of the upfront capital
  • Doesn't factor in storage, maintenance, or repair costs over long ownership
  • Assumes a constant uses-per-week — many items are seasonal or aspirational

Worked example

A buyer is considering a $1,500 e-bike with $20/month maintenance, used 5 times a week, kept for 4 years (48 months), with an expected $400 resale value.

Input Value
Purchase price $1,500
Monthly ongoing $20
Ownership 48 months
Uses per week 5
Resale value $400

TCO: $2,060 — Total uses: ~1,040 — Cost per use: ~$1.98

Ongoing cost: $20 × 48 = $960. TCO = $1,500 + $960 − $400 = $2,060. Total weeks: 48 × 4.33 = ~208. Total uses: 5 × 208 = 1,040. Cost per use: $2,060 ÷ 1,040 ≈ $1.98. That's well below the $5 'worth it' heuristic — for a daily commute alternative to fuel/transit, the e-bike is genuinely cheap per ride. If usage drops to 1/week, cost per use rises to ~$10 — much harder to justify.

Frequently asked questions

What is cost per use?

The total dollar cost of owning an item divided by the number of times you actually use it. It surfaces a useful truth: a $200 item used 100 times costs $2/use; a $30 item used twice costs $15/use. Cost per use lets you compare options that look very different on the sticker price by normalising on actual utility delivered.

How do I decide if something is worth buying?

Honestly estimate uses per week and ownership duration, then run the calculator. A heuristic threshold: under $5/use is usually 'worth it'; $5–20/use depends on quality and alternatives; above $20/use is hard to justify unless the item brings genuinely irreplaceable value. The biggest mistake is overestimating uses — assume you'll use it half as often as you imagine and see if the math still works.

What items have the lowest cost per use?

High-quality items used daily that resell well: bikes, kitchen tools, well-built furniture, classic clothing. Subscriptions and services that provide repeated value (gym, streaming) are also typically low cost per use if used regularly. The worst cost-per-use items: aspirational gear (used once or twice), cheap items that break, novelty subscriptions you forget about, single-occasion outfits.

How does resale value affect cost per use?

Resale recovery reduces TCO, sometimes dramatically. A $1,000 item resold for $400 has a TCO of $600 — 40% less than the sticker price. Brands with strong second-hand demand (well-known watch brands, sturdy tools, popular cycling gear) routinely retain 30–50% after years of use. Buying for resale value is a deliberate strategy: pay more upfront for items that hold value rather than cheap items that go to landfill.

How is cost per month different?

Cost per month divides TCO by ownership months — useful for budget comparisons but doesn't capture utility per touch. A car at $400/month with 30 uses/month costs $13/use; a streaming service at $15/month with 30 viewings costs $0.50/use. Use cost per month for budgeting (does this fit?), use cost per use for value (am I getting enough out of it?).

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