Dish and Glass Rack Sizing Guide

How to match racks to plates and glasses, choose compartments and extenders, and fit every rack to your dish machine

A standard commercial dish rack is the full-size "20 by 20" rack, which measures about 19-3/4 inches square on the outside, and nearly every commercial dishwasher and most rack-style glasswashers are built to take it. Half-size racks keep the same length at half the width, and a rack gets taller with snap-on extenders rather than a bigger footprint.

Commercial Dish Rack Sizes at a Glance

Buy full size unless there is a reason not to. Machines, dollies, covers and underbar units are built around it; half-size racks suit short runs and narrow shelves.

Rack Types and What Each One Holds

Plates want pegs. Pegs hold plates on edge so the spray reaches both faces. The FDA Food Code (section 4-603.13) asks for machine-washed items to be racked so they meet unobstructed spray from every cycle and can drain.

Flatware has two routes. A flat rack takes one layer for soaking. Cylinders stand pieces sorted and upright, so the clean side can pick them up by the handles only, as the Food Code asks (section 4-904.11).

Matching Glasses to Compartments

The compartment count sets the widest glass a rack will take. More compartments means narrower cells.

The next chart is a starting point by glass. Typical sizes are the middle of the range across the glassware we list, so measure your own.

How to measure a glass for a rack:

1. Measure straight across the widest point: the rim on a tumbler, the bowl on a wine glass. On a mug that sits inside a cell, include the handle.
2. Measure from the table to the rim. Glasses ride upside down, so the full height has to clear the rack.
3. Pick the compartment count whose listed maximum glass diameter beats your width with room to spare.
4. Pick the extender count whose listed maximum glass height beats your height.
5. Load one rack and stack an empty rack on top before ordering the batch.

Leave room, but not too much. A glass pushed into a tight cell chips at the rim; one that swims rattles in the spray. Rack lines differ slightly, so trust the listing's figures. Pour sizes by beer style are in our beer glass sizes chart.

Extenders and Rack Height

An extender is a ring of cells that snaps onto a rack to make it taller. Racks come with one to six already attached, and loose extenders raise racks you already own, as long as the compartment count matches. Stemware extenders suit stemmed glasses, and snap-on ID clips printed with the glass name tell the bar which rack to grab.

These are the most common full-size racks we list. Low-profile racks and one other line take a taller glass at each step. Size for the tallest glass of the type, then check the rack still fits the machine.

How Racks Fit Dish Machines and Glasswashers

The footprint is standard; the clearance is not. Compare the rack's outside height with the door opening or chamber clearance on the machine's listing.

The undercounter is where tall racks get caught. The low end of the undercounter dishwasher range will not take a rack built for tall wine glasses, while any door-type dishwasher on our listings takes every standard compartment rack.

Bar machines vary the most. Most rack-style glass washers take standard racks, but the pass-through bar models on our listings come with their own round racks.

How Many Racks a Station Needs

Glass racks: count the glassware. Glasses usually live in their racks from the wash to the bar. For each glass type, divide the number you own by the compartments per rack and round up.

Dish racks: count the flow. Plates go back to a shelf, so peg and open racks are sized by what is moving: one rack loading on the soiled side, one in the machine and one draining on the clean side, for each type washed at once.

Check the machine keeps up. Racks per hour on the machine listing, times compartments per rack, gives glasses per hour. Compare that with your busiest hour.

Worked example, for a bar and dining room with the stock below:

Round up, never down. A glass with no rack ends up on a towel, and the Food Code rules out cloth drying (section 4-901.11), though air-dried glasses may be polished with a clean, dry cloth.

Storing and Moving Racks

The FDA Food Code sets the storage rule in section 4-903.11: clean equipment and utensils go in a clean, dry place away from splash and dust, at least six inches above the floor, draining so they air-dry, and covered or inverted. Racked glasses already sit inverted, so storage comes down to the floor and the dust.

Keep the bottom rack off the floor. A stack set on the tile puts its bottom rack of clean glasses below the six-inch line. Rack dollies move the stack; a raised dolly, a shelf or an underbar glass rack storage unit keeps it clear.

Store and dry what racks don't hold. Overhead hanging glass racks show off stemware at the bar, but the glasses still go through the machine in a compartment rack. Sheet pans and trays drain on edge in a drying rack cart.

Shop Dish and Glass Racks

Racks work as a set built around one footprint. Start with dish and flatware racks for peg, open, flatware and tray racks, then pick glass racks and cup racks by compartment count and extender height for each glass you pour. Many racks sell in multiples, so check the minimum quantity on the listing, and add loose extenders, ID clips and covers as the glassware grows.

Related Guides & Resources

• Commercial Dishwasher Guide - Machine types, capacity and sizing for the racks you run.
• Commercial Glasswasher Guide - Bar glasswashers from rack models to pass-through units.
• Commercial Sink Sizing Guide - Compartment sinks and drainboards for hand washing.
• Sheet Pan Sizes - Pan dimensions to check against a tray rack or a tall machine.

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