Comparison — bar soap or liquid
The cost calculator leaves bar soap out: a bar does not convert into litres. The question still deserves a worked answer, and it does not always come out in favour of the liquid.
A 30 g bar is used two or three times, then thrown away. That is what sinks it, not its purchase price. The 200 g bar stays in place from one stay to the next — and changes the calculation entirely.
The calculator above starts from a property of 80 rooms at 70% occupancy and a 1.8-night average stay — 20,440 room nights and 11,356 stays a year — with a small bar at €0.70, a 200 g bar at €6.50 replaced every 12 stays, and refillable shower gel at €8/L for 10 ml consumed per night.
| Format | Cost / year | Per occupied room | Units / year | Waste / year |
|---|---|---|---|---|
| Small bar 30 g | €7,949 | €0.39 | 11,356 bars | 341 kg |
| Bar 200 g | €6,151 | €0.30 | 946 bars | 189 kg |
| Refillable shower gel | €1,635 | €0.08 | 204 L | container reused |
On these assumptions, refillable costs about four times less than the 200 g bar and close to five times less than the small bar. The reason is not the purchase price: it is that bar soap is handed out per stay while liquid is consumed per night. A one-night guest receives a whole bar and uses 10 ml of gel.
That ratio reverses as stays lengthen. At unchanged prices, the 200 g bar catches the refillable gel at around 6.8 nights of average stay:
| Average stay | Small bar | Bar 200 g | Refillable gel | Cheapest |
|---|---|---|---|---|
| 1 night | €14,308 | €11,072 | €1,635 | Gel |
| 1.8 nights | €7,949 | €6,151 | €1,635 | Gel |
| 3 nights | €4,769 | €3,691 | €1,635 | Gel |
| 5 nights | €2,862 | €2,214 | €1,635 | Gel |
| 7 nights | €2,044 | €1,582 | €1,635 | Bar 200 g |
Put another way: in a city hotel, bar soap is a choice about experience or positioning, not about budget. In an aparthotel or a long-stay property it becomes defensible on both counts at once.
Figures produced by the calculator above, on its default values. Purchase prices and the number of stays per bar are market assumptions: replace them with your own and the conclusion may change.
Yes, but rarely in the form it most often takes. The 30 g bar at the basin is the least defensible of the three formats: it is used two or three times, thrown out whole when the guest leaves, and the one the guest takes home ends up damp at the bottom of a washbag and forgotten. The gesture goes down well; the outcome is poor.
The 200 g bar changes things, but only against the small bar. It stays in place from one stay to the next, spreads across dozens of guests, and needs neither a wall bracket nor refilling: it costs about 20% less than the small bar on the default values. Against refillable shower gel it stays clearly more expensive as long as stays are short — bar soap is consumed per stay, liquid per night. The calculation below shows it, and the crossover only arrives beyond six or seven nights of average stay.
Only if it is presented with no disposable individual packaging. That is the distinction that matters, and it does not line up with the one between bar and liquid.
Regulation (EU) 2025/40 stops economic operators, from 1 January 2030, placing on the market single-use packaging for cosmetics, hygiene and toiletry products intended for an individual booking only. Its Annex V point 5 names among its illustrative examples “sachets around bar soap”. A 30 g bar in a sachet, replaced on every arrival, is therefore caught exactly as a shampoo bottle is — the fact that it holds no liquid changes nothing.
A bar presented unwrapped on a soap dish, by contrast, involves no single-use packaging at all: there is nothing to ban. That is a direct reading of the text, still to be confirmed by the Commission guidelines expected in February 2027.
Put another way, the format outside the scope is not “bar soap” but “unwrapped bar soap” — which is precisely the 200 g bar the calculation above already picks out as the most defensible of the three. The two lines of reasoning converge, which is convenient, but they remain independent: the 200 g bar was the best economic choice before it was the only one out of scope. The text, the dates and the sources →
On the container, yes: no bottle, no pump, a light paper wrap. On the product itself the comparison is less clear-cut than advertised, and it depends on the formulation. The difference defensible without further data is the packaging avoided and the product not thrown away — two measurable things.
Because they do not cover the same uses. A bar of soap replaces hand wash at the basin, and possibly shower gel. It replaces neither shampoo, nor conditioner, nor body lotion. A property that goes all-bar reduces what it offers, which is a choice — but a choice about positioning, not about saving money.
It is the main objection, and it is legitimate in perception even where it is barely so in practice. Two answers: a draining soap dish that stops the bar going soggy, and a replacement rule written into the housekeeping procedure. Without a procedure everybody improvises and the format turns against you.
Collection and recycling schemes for hotel soap exist and work. They do not make the 30 g bar make economic sense, but they deal honestly with what comes out of it. Worth looking at if you keep the format for service reasons.
Real cost calculator → single-dose against refillable
Format guide → the five formats side by side
Glossary → the vocabulary of the subject
Regulation → why it is the packaging, not the bar, that decides
The three options are brought to the same denominator: cost per occupied room, over the same use (washing body and hands).
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