Break-even duration

Equipment rents on three rates — a day rate, a week rate and a 28-day rate — and the cheapest one changes as the job runs long. This finds the two days where it changes, on a real listing’s real published rates.

Cornwell Battery Starter and 12V Power Supply

See the listing →

Thad Bowman · Batteries and Charging Equipment

Day
$25
Week
$65
28 days
$130

Daily stops winning on

day 3

3 days at the day rate would be $75. On the week rate it is $65.

Weekly stops winning on

day 10

10 days at the day rate would be $250. On the 28-day rate it is $130.

The working

Whole weeks bill at the week rate; the leftover days bill at the day rate but never add up to more than one extra week; and a whole 28-day cycle never costs more than the 28-day rate. That is the rule, applied one day at a time.

Rental price by duration for Cornwell Battery Starter and 12V Power Supply, days 1 to 35
DaysAt the day rateOn the ladderDifferenceRate in play
1$25$25—day
2$50$50—day
3$75$65you save $10week
4$100$65you save $35week
5$125$65you save $60week
6$150$65you save $85week
7$175$65you save $110week
8$200$90you save $110week
9$225$115you save $110week
10$250$130you save $12028-day
11$275$130you save $14528-day
12$300$130you save $17028-day
13$325$130you save $19528-day
14$350$130you save $22028-day
15$375$130you save $24528-day
16$400$130you save $27028-day
17$425$130you save $29528-day
18$450$130you save $32028-day
19$475$130you save $34528-day
20$500$130you save $37028-day
21$525$130you save $39528-day
22$550$130you save $42028-day
23$575$130you save $44528-day
24$600$130you save $47028-day
25$625$130you save $49528-day
26$650$130you save $52028-day
27$675$130you save $54528-day
28$700$130you save $57028-day
29$725$155you save $570day
30$750$180you save $570day
31$775$195you save $580week
32$800$195you save $605week
33$825$195you save $630week
34$850$195you save $655week
35$875$195you save $680week

Rental rates only. Protection and the marketplace service fee are added on top — see the checkout figure below.

What checkout will quote you

Rental · 10 days
$130
Rental protection (RPP)
$19.50
Service fee
$13
Estimated total
$162.50

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The numbers come from one operator’s published rates, so the tool needs to know whose.

Where these numbers come from

The rates are the operator’s own, read live from their listing. The arithmetic is the same best-price billing engine that produces 2Quip invoices — not a second copy written for this page — run on the industry-standard terms: a 28-day cycle, whole weeks at the week rate, leftover days at the day rate capped at one more week.

An operator can agree different terms on an individual rental, and a long rental bills per 28-day cycle rather than in one lump. So treat this as what the rate card says, and the operator’s quote as what you are agreeing to.