How we run this check
The count comes first. Section 226.1 of the 2010 ADA Standards for Accessible Design asks for at least 5% of the seating spaces at dining surfaces to comply with section 902, and section 104.2 says fractions round up rather than down. So 120 covers becomes six accessible seats, 41 covers becomes three, and even a twelve-seat room owes one. We count seats, not tables, because that's how the standard counts — an accessible table with two clear positions under it settles two of them.
Then the furniture has to actually work. Section 902.3 puts the dining surface between 28 and 34 inches above the finish floor, which is why a 30-inch dining table passes and a 36-inch counter or 42-inch bar top doesn't. Under that surface, section 306.3 wants 27 inches of knee height, 30 inches of knee width, and 19 inches of knee depth measured in from the front edge, with toe clearance under section 306.2 below it. We check those three independently because they fail independently.
Where specs actually go wrong
Knee height is the one that catches people, and it's a furniture problem rather than a floor plan problem. A 30-inch-high table sounds comfortably inside the range until you add a 4-inch apron and the underside lands at 26 inches — an inch short, on a table that measured fine. Pedestal bases are the other one: a wide cast foot or a four-star base that spreads into the knee zone eats the 30-inch width or blocks the 19 inches of depth. When we spec accessible tables we look at the underside height and the base footprint on the drawing, not the catalogue height. A slimmer apron, a thinner top, or a different base usually buys back the inch you need without changing the look of the room.
Two requirements can't be computed from dimensions, so we flag them for you to verify rather than pretend to grade. Section 305, applied through 902.2, needs a 30-by-48-inch clear floor space at each accessible seat with the 48 inches running toward the table for a forward approach — that space may overlap the knee space under the surface, but it has to exist on the plan. And section 226.2 requires the accessible seats to be dispersed among the seating types and areas you offer, so the compliant tables can't all live in one corner by the service station.
Last, the route. Sections 402 and 403.5.1 want 36 inches of clear width on the way to accessible seating, with a pinch to 32 inches permitted only for a maximum of 24 inches of length. Measure it between chair backs with the seats occupied — that's the aisle your room really has at full service, and it's usually several inches tighter than the gap between table edges. If your layout isn't settled yet, settle the aisles and the table grid first, then bring the numbers back here.
One more time, because it matters: this is a planning aid built on the federal 2010 Standards. State accessibility codes, local building codes, and the authority having jurisdiction on your permit can all be stricter, and their reading is the one that governs. Nothing here is legal advice or a substitute for a plan review. When you know what you need, send us the plan and we'll spec the tables that hold the clearances.