Four different numbers, only one of them useful
A $412 bill across 24 occupied nights in a 31-day month can be divided four ways and they do not agree.
| Figure | Amount | What it is |
|---|---|---|
| Bill over occupied nights | $17.17 | the number most people quote |
| Bill over calendar days | $13.29 | fine for budgeting, useless for pricing |
| A vacant night | $5.86 | the standing cost, which arrives regardless |
| One more occupied night | $9.60 | the only one that answers a pricing question |
The quoted figure is 1.8 times the real marginal cost, and the reason is arithmetic rather than mystery: dividing by occupied nights loads the entire standing cost onto whichever nights happened to sell. In a busy month that division flatters you and in a quiet one it terrifies you, while the underlying property has not changed at all. The last table on the page makes that explicit — the same standing cost and the same marginal cost produce a per-occupied-night figure of $32.30 at eight nights and $15.46 at thirty-one.
How the split is found
Two months, two occupancy figures, one line. The busier month is $412 over 24 nights and the quieter is $268 over 9, a difference of $144 across 15 extra nights, so a night adds $9.60 and the standing cost is $181.60 a month or $5.86 a day. That is genuinely all it is, and it is worth being suspicious of exactly how neat it is: two points always define a line, including when the line is wrong.
The obvious way for it to be wrong is weather. If the busy month was also the hot one, some of that $144 was air conditioning that would have run anyway. The weather field lets you say so — put 30 percent of the difference down to the season and the marginal cost falls to $6.72 while the standing cost rises to $250.72. Neither number is more measured than the other; you have just written your assumption down where it can be argued with.
What it is for
One more night on a booking somebody is already taking costs $9.60 of utilities and $6 of consumables, and brings $140.25 after a 15 percent platform cut on a $165 rate. It clears $124.65, and it would still clear at any rate above $18.35. That is a different question from whether to take a whole extra booking, which drags a turnover along with it and is a much bigger number. Keep the two apart and the discount conversation gets a lot shorter.
Questions people ask
How much do utilities cost per night in a short-term rental?
For the property in the form, $9.60 for one more occupied night and $5.86 for a night with nobody in it. Dividing the whole $412 bill by the 24 occupied nights gives $17.17, which is nearly double the marginal figure, because that division loads the whole standing cost onto the nights that happened to sell.
Why is cost per occupied night the wrong number?
Because it moves when nothing about the property has. With a $181.60 standing cost and $9.60 a night marginal, the same house shows $32.30 per occupied night at eight nights of occupancy and $15.46 at full occupancy. It is a useful figure for looking back at a month and a misleading one for deciding whether to take a booking.
What if the busy month was also the hot month?
Then part of the difference in the bills was the weather rather than the guests, and the split overstates what a night costs. The page has a field for it: attributing 30 percent of the $144 gap to the season takes the marginal cost from $9.60 to $6.72 and pushes the standing cost from $181.60 to $250.72. There is no way to measure the split from two bills, so the field exists to make the assumption visible rather than to hide it.
How low can I discount a night before it costs me money?
For one more night added to a stay somebody is already taking, $18.35 at these numbers — below that the platform cut leaves less than the $9.60 of utilities and $6 of consumables the night adds. A discount that wins a whole extra booking is a different sum, because it brings a turnover with it, and the page says so rather than blurring the two.