How to Load a Dishwasher: A Diagram for Every Rack

Picture the tub from the front with the door open. The top rack sits above the bottom rack, a third rack rides at the very top on machines that have one, and the silverware basket sits in the door or at the front of the bottom rack. The lower spray arm turns under the bottom rack, a mid-level spray arm turns between the two racks, and a wash tower rises through the center of the bottom rack on models that use one. The detergent dispenser is set into the door, and the heating element runs along the floor of the tub on many US models.

The geometry explains every rule that follows. The lower arm sprays upward, and the mid-level arm sprays up and down, so the underside of the top rack and the top of the bottom rack are hit from two directions. The dispenser sits on the door, so a tall item at the front of the bottom rack can stop it from opening, and the symptom is undissolved detergent left in the cup. The heating element at the bottom is why plastics belong up top. The corners of the upper rack are the weakest spots, because the arms reach them worst, so the messiest dishes never go there. On a machine with a wash tower, keep the center of the bottom rack clear.

1. Face the soiled side toward the center and angle it down. Water reaches the dirty surface and then drains off it.
2. Stand plates between the tines, never over them. Stacking over the tines hides surfaces and lets dishes touch.
3. Don't let anything touch or nest. Contact points stay unwashed, and nested spoons shield each other.
4. Keep the spray arms and the dispenser clear. Spin the arms by hand before you close the door.
5. Don't overcrowd. A full load washes better than a crammed one, so leave gaps for water to move.
6. Scrape, don't pre-rinse. Soil sensors and enzymes need some soil to work on, and a running faucet uses more water than a cycle: an Energy Star machine uses under 4 gallons per cycle, while a kitchen faucet runs about 1.5 to 2 gallons a minute.

Cups, mugs, glasses and wine glasses go upside down, along the sides, front to back, at a slight angle so water does not pool in the base. Small bowls and plates angle down toward the center of the rack. Plastics go on the top rack only, away from the bottom heating element. Long utensils lie flat rather than standing through the tines.

Stemware clips and a height-adjustable upper rack are loading tools. Drop the rack for tall glasses, and raise it to fit stock pots in the bottom rack below.

Dinner plates stand between the tines, soiled side toward the jets, alternating large and small, and never stacked. Bowls angle so they drain. Pots and pans go at the sides or the back with their handles pointed away from the spray arms. Baked-on items face down toward the lower spray arm.

Platters, cutting boards and baking sheets go on the perimeter, toward the sides and the back, and never flat across the front, where they block the dispenser and the detergent's path to the dishes. On a machine with a wash tower, keep the center clear.

The third rack takes mugs, small bowls, flat utensils and cutlery on models with a cutlery tray. It is for small, flat items, not a second plate rack.

In the silverware basket, forks and spoons go handles down, knives handles up with the blades down, and the types are mixed so spoons cannot nest inside each other. Owner's manuals disagree on the direction, and the principle behind both is separation and drainage, not one universal rule: follow your own manual and never let pieces nest. Long knives and utensils should not poke through the bottom of the basket.

A 24-inch built-in with 12 to 15 place settings follows the standard two- or three-rack pattern above. The smaller and less common machines need their own layout, and the rack size is what changes.

18-inch slim machines

The racks are narrower, so plates go in single file between the tines and tall items move to the edges. The smaller tub means overloading happens sooner, and a load that looks half full can already be blocking an arm.

Portable and freestanding machines on wheels

A full-size tub on wheels takes the standard pattern. The difference is that you load at counter height and check the spray arms before you wheel the machine to the sink.

Countertop machines

For four place settings, put plates at the back, glasses and cups upside down at the front, and cutlery in the basket. Very small items can fall through the basket, and long knives go laid flat, not upright.

Commercial machines

Follow the rack pattern printed on the machine. The same principles apply: soil toward the jets, nothing nested, arms clear.

A place setting is a defined standard (AHAM DW-1: cup, saucer, dinner plate, bread-and-butter plate, fruit bowl, iced-tea glass, dinner fork, salad fork, knife, two teaspoons), and a compact machine is defined as fewer than 8 place settings. That is why a countertop unit fills faster than its advertised number suggests.

Angle concave bottoms and mugs so water runs off. Pooled water in an upturned base is a loading problem, not a machine problem. Plastics dry worst, so they stay on the top rack, away from the element.

Load back to front, and unload the bottom rack first, so water pooled on the upper rack does not drip onto the dry dishes below.

• A spray arm is blocked or cannot spin. Spin it by hand with the door open.
• Something tall sits in front of the detergent dispenser. Look for undissolved detergent in the cup.
• Items are nested or touching. Contact points and shielded surfaces stay dirty.
• The load is overcrowded. Water cannot reach the middle of a crammed rack.
• Something pokes through the rack bottom, or the messiest dishes sit in the upper-rack corners. Both keep water from the surface that needs it.

Keep out nonstick pans, kitchen knives with fine edges, fine china, crystal, wood, silver, cast iron, and anything that cannot take water over 120 °F. Keep silver and stainless apart to avoid a reaction, and rinse off mustard, mayonnaise, vinegar, lemon and tomato soils before they sit, since they can discolor stainless and plastic.

A one-page, letter-size version of the main diagram with the six rules fits on the fridge door. It matches the rack layout of most US machines, and the machine-type notes for the slim, portable and countertop layouts are on the back.