Equipment Buy vs. Rent Calculator
The purchase price is the misleading part of the buy-vs-rent decision. Enter the price, its working life, what owning costs per day, and the rental rate — and see the break-even days of use where buying starts to win, plus the annual cost of each option at your usage.
Method and content reviewed October 1, 2026 · formulas checked against a test suite · runs entirely in your browser
Break-even days = (Price ÷ Working life) ÷ (Rental rate − Daily ownership cost)$533.33 ÷ ($65.00 − $12.00) = 11 daysThe math covers cash, not capability: owning means the tool is there on the surprise Saturday job; renting means flexibility and zero shelf. A fair rule: buy what the break-even justifies with margin to spare, rent what comes down once or twice a year — and let the number, not the excitement of new kit, decide the gray zone.
Plumbing: where the number comes from
A plumbing business is deciding on a $3,200 drain auger: 6 years of realistic working life, $12/day of ownership (storage, maintenance, insurance), against a $65/day rental. (Illustrative example — use your own quotes.)
| Input | Value |
|---|---|
| Purchase price | $3,200 |
| Working life | 6 years |
| Cost of owning per day | $12 |
| Rental rate | $65/day |
| Days of use per year | 30 |
Result: Break-even at 11 days/year — at 30 days of use, buying wins by $1,056.67
Spread over 30 days of use, the owned day costs $29.78 against a $65 rental day — the rental day is paying for the yard's overhead too. Below 11 days a year renting wins; at 30, buying has saved $1,056.67 and the auger is on the truck for the surprise call.
Load this example into the calculatorThe calculation
| Capital recovery per year | $3,200 ÷ 6 = $533.33 |
| True owned-day cost at 30 days | $533.33 ÷ 30 + $12 = $29.78/day |
| Break-even days | $533.33 ÷ ($65 − $12) = 10.1 → 11 days |
| Annual cost of owning | $533.33 + ($12 × 30) = $893.33 |
| Annual cost of renting 30 days | 30 × $65 = $1,950.00 |
| Savings from buying | $1,950 − $893.33 = $1,056.67/yr |
How this calculator works
Every result comes from the formulas below — the math shown is the math used. Change any input and results update instantly in your browser; nothing is sent to a server.
- Capital recovery per year:
Capital per Year = Purchase Price ÷ Working LifeThe purchase spread over the years you'll use it — not all charged to year one. - Break-even days of use:
Break-even Days = Capital per Year ÷ (Rental Rate − Daily Ownership Cost)Above this usage, owning wins; below it, renting does. - True cost of an owned day:
Owned Day Cost = Capital per Year ÷ 365 + Daily Ownership CostCapital plus the cash cost of keeping it — storage, maintenance, insurance — even on days it sits. - Annual cost of each option:
Own = Capital + Own Cost × 365 ; Rent = Rental Rate × Days Used
What the result means
The break-even is where capital recovery plus per-day wear equals the rental rate: above it, owning wins; below it, renting does. The owned-day row shows what a day of use truly costs at your volume — the rental rate is constant, the owned day isn't.
When to use it
Use it before any tool purchase over a few hundred dollars — and again when usage patterns change, because the break-even moves with them.
Want the concept behind the math in depth? Read Buy or Rent Equipment? The Break-Even Days of Use Decide It or General Contractor Markup: What's Typical and What Yours Should Be.
Common mistakes
- Charging the whole purchase to year one instead of spreading it over the working life.
- Counting storage and insurance per day here and again in overhead — pick one place.
- Buying for the excitement of new kit when the usage honestly sits below break-even.
Frequently asked questions
When is it cheaper to buy equipment instead of renting?
When annual usage passes the break-even: capital per year divided by the rental rate minus your daily ownership cost. A $3,200 tool with a 6-year life, $12/day of ownership and $65/day rental breaks even at about 10 days a year — buy what you use monthly, rent what comes down twice a year.
What counts as the daily cost of owning?
Everything that exists because the tool is yours: storage or shelf space, maintenance and consumables, insurance share, and the depreciation of value while it sits. The purchase price itself is handled by capital recovery over the working life — putting it in the daily cost too would double-count it.
What does this calculation leave out?
Capability and cash. Owning means the tool is there on the surprise Saturday job and financed through the quiet months; renting means flexibility, zero shelf, and the yard's maintenance. Resale value also softens the true cost of owning — the working-life input handles it roughly; a tool with strong resale is cheaper to own than this shows.
Should I finance the purchase instead?
Financing changes the timing of the cash, not the economics — the interest replaces some of the capital-recovery cost and the break-even moves only slightly. What financing genuinely changes is the risk: payments continue whether the work does. Buy what the break-even justifies and the calendar can carry.
Bought it? The daily ownership cost now lives inside your overhead — make sure it's recovered.
Update your overhead →Related tools and guides
Equipment Buy vs. Rent Calculator is part of RateCraft, a set of free pricing and estimating tools for contractors and service businesses. Results are calculated entirely in your browser and are estimates for planning purposes — see our disclaimer and methodology.