The sticker price lies. The per-setting price doesn't.

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Shop this category by sticker price and you'd rank these five machines cheapest to priciest and call it a day. But a $169 countertop dishwasher and a $610 machine on wheels aren't selling the same thing, and the number that actually tells you whether either is a good deal — price per place setting — is one most listings never print. Two of the five products in this comparison state a place-setting count. The other three don't, and that absence is itself worth paying attention to.

This isn't a roundup of which machine washes dishes best; it's a worksheet. We show the formula, the two machines we can actually run it on, why the other three resist the math, and the point at which spending more per setting stops being worth it.

Line the five machines up by price and the order looks decisive: the BEADSTER Countertop Dishwasher at $169.00, the Collier Kitchen Portable Countertop Dishwasher at $169.99, the EUHOMY Countertop Dishwasher Portable at $249.00, the COMFEE' Countertop Dishwasher at $278.94, and the BLACK+DECKER 18-Inch Portable Dishwasher at $609.99. Read that list and the instinct is obvious: buy one of the two under $170 and save hundreds.

The instinct breaks down the moment you ask what each dollar is actually buying. A sticker price is a single number standing in for a bundle of things — wash volume per cycle, how many plates and bowls fit, what cycles are included, whether it needs a faucet or just a wall socket — and nothing forces two listings to bundle those things the same way. Some sellers even run the same physical machine under several names at several prices, which is exactly the trap we unpacked in our look at the AIRMSEN lineup: near-identical hardware, different price tags, and no honest way to compare them on sticker price alone.

Price per place setting fixes the comparison by dividing out the one variable that actually drives how much washing a machine does for you. It doesn't fix everything — water source, noise and counter space still matter — but it stops a $169 machine that holds three place settings from looking like a steal next to a $279 machine that holds six.

The formula is one division:

Two assumptions make this honest rather than decorative. First, a "place setting" is a defined unit, not marketing copy — roughly a dinner plate, a side plate or bowl, a glass, a cup and saucer, and one person's cutlery, around ten items. Manufacturers that state a place-setting count are using that same yardstick, which is why the number is comparable across brands in a way "washes 30+ dishes" is not. Second, we're dividing the current database price, not a list price or a sale price you might catch for a day — the date is shown next to every price on this page so you know exactly when it was true.

Of the five machines here, only two state a place-setting count on their listing: the COMFEE' Countertop Dishwasher at 6 place settings and the BLACK+DECKER 18-Inch Portable Dishwasher at 8 place settings. Run the formula on those two and the gap the sticker price implies narrows sharply:

• COMFEE' Countertop Dishwasher — $278.94 ÷ 6 place settings = $46.49 per place setting
• BLACK+DECKER 18-Inch Portable Dishwasher — $609.99 ÷ 8 place settings = $76.25 per place setting

The sticker prices made the BLACK+DECKER look more than twice as expensive. Per place setting, it's about 64% more expensive — a real premium, but a very different number from the one the two price tags suggest. That's the entire point of running the math before you shop by price alone.

The three cheapest machines in this comparison — the BEADSTER, the Collier and the EUHOMY — don't state a place-setting count, and that's not an accident of listing copy. All three are built around a small countertop tub with a 5-litre built-in tank (the BEADSTER's own title states the 5-litre tank; the EUHOMY's listing describes the same 5-litre tank or a faucet hose as the two fill options), and a 5-litre tank is a hard ceiling on how much water a cycle can use — which in turn caps how much the rack can hold before the spray can no longer reach everything.

That ceiling is a general fact about tank-fed countertop dishwashers as a class, not a number we're assigning to these specific machines — we don't have a stated place-setting figure for any of the three, and we won't invent one. But the mechanism explains why a $169 sticker price doesn't automatically mean a $169 cost per load. If a small-capacity machine can only clear half of what a family generates after dinner, you either run it twice — twice the water, twice the detergent, twice the electricity for a short heated cycle — or you're back at the sink hand-washing the overflow, which is the exact chore these machines exist to remove. A $279 machine that clears the sink in one run can be the cheaper option per load even though it cost more up front.

This cuts the other way too. For one or two people with a light dish load, a small tank machine's real per-load cost may never approach a bigger machine's, because the tank was never the bottleneck — the dishes were. That's a fair description of a lot of dorm-room and single-occupant setups, where sticker price and footprint matter more than theoretical capacity nobody will use. The honest answer is: know which buyer you are before the place-setting math decides anything for you.

It's also worth checking what ships in the box before you compare prices at all. A faucet adapter, a drain hose and the fittings to make either connection work aren't always included at every price point, and a machine that needs you to buy a $15 adapter separately is quietly $15 more expensive than its sticker price — see what actually comes in the box with a portable dishwasher before you assume the listed price is the whole price.

Price per setting tells you the average rate you're paying. It doesn't tell you the rate for the extra capacity above what a cheaper machine already gives you — and that marginal rate is where a lot of "just get the bigger one" advice falls apart. Here's the same two machines, this time looking only at the gap between them:

Stepping up from the COMFEE's 6 settings to the BLACK+DECKER's 8 costs $331.05 for two additional place settings — $165.53 for each one, more than double the BLACK+DECKER's own overall per-setting price of $76.25, and over three times the COMFEE's $46.49. That's the number that should give you pause: you are not paying the machine's average rate for those last two settings, you're paying a steep premium for them specifically.

Whether that premium is worth it depends on what else you're buying along with the two extra settings, because the BLACK+DECKER isn't just "a bigger COMFEE'." It's a different class of appliance entirely — a full 18-inch dishwasher on castors that rolls to the sink and gives you back a finished counter surface, versus a machine that permanently occupies close to two feet of worktop. If you specifically need the floor-standing class — more floor space than counter space, a household too big for six settings, or a long-term plan to convert the unit once you own a kitchen you can modify — the $165.53 marginal rate buys real, distinct value. If what you actually want is "the same machine, slightly bigger," the marginal math says don't: buy the cheaper machine twice before you'd spend the difference once.

Spread either price over the machine's working life and the marginal gap narrows further, which is really a question about ownership cost rather than sticker price — see how long a portable dishwasher actually lasts for how to think about that amortization honestly. And if the wheeled class appeals mainly because it feels like "the real appliance," it's worth knowing a handful of 18-inch models are designed to eventually install permanently — that's a different decision than the one in front of you today, covered in our guide to convertible portable dishwashers.

Use this on any portable dishwasher listing, not just the five above:

1. Find the stated place-setting count. It's usually in the title or the first bullet. If the listing only says "washes 30+ dishes" or similar, that is not a place-setting count — treat it as unstated.
2. If no count is stated, don't estimate one. Either count the individual plates, bowls, cups and utensils the listing itself describes and divide by ten, or accept that you can't rank this listing on price per setting and judge it on price, tank capacity and dimensions instead.
3. Divide the current price by the place-setting count. Use the live price on the page you're looking at, not a number from a review site — prices move daily.
4. Compare the result only within the same class. Price per setting on a countertop machine versus another countertop machine is a fair fight. Comparing a countertop machine against an 18-inch floor-standing one tells you about the capacity premium, not about which is the better countertop dishwasher.
5. Before upgrading for capacity alone, calculate the marginal rate. Subtract the cheaper machine's price from the pricier one's, subtract the cheaper machine's settings from the pricier one's, and divide. If that number is well above either machine's own per-setting price, you're paying a premium for the extra capacity specifically — make sure you need it before you pay it.

If a cycle-count comparison matters as much as capacity to you — some buyers care more about how many wash programs a machine offers than how many settings it holds — the same "state it or it doesn't count" rule applies, and our guide to wash-program counts walks through which extra cycles are worth paying for.