Theatre Style Seating

What theatre style is

Rows of chairs, all facing the same direction, no surface in front of anyone. Ceremonies, keynotes, product launches, AGMs, funerals - anything where people watch something for less than about ninety minutes.

The reason it stops working past ninety minutes is that there is nowhere to put anything. No drink, no notepad, no laptop, no bag except under the chair. That is a fair trade for a keynote and an unfair one for a training day.

Variations exist and are all the same layout turned slightly. Semi-circle theatre curves the rows around the stage. Chevron or herringbone angles the blocks inward. Both cost a few percent of capacity and buy noticeably better sightlines in a wide room.

Diagram and row spacing

Two numbers describe a theatre setup. Seat width is 18 to 20 inches for a standard banquet chair, more if the venue uses padded conference chairs with arms. Row spacing is measured back of chair to back of chair, and 36 inches is the practical minimum for a room where people will need to get past each other.

At 32 to 34 inches the room holds more people and every latecomer forces an entire row to stand. At 40 inches people can pass a seated guest without contact, which is worth the lost row in any event that runs long enough for people to leave and return.

The seats-between-aisles figures come from common assembly practice and are the numbers most venues work to. Your venue's license, not this table, is what governs the room.

Maximum capacity calculation

Usable width divided by seat width gives seats per row. Usable depth divided by row spacing gives the number of rows. Multiply, then subtract the seats you lose to aisles.

A worked example: a 60 by 40 foot room with a 12-foot stage and a 42-inch perimeter walkway. Usable width is 60 feet minus 7 feet of walkway = 53 feet, or 636 inches. Two 48-inch aisles leaves 540 inches, or 27 seats per row at 20 inches. Usable depth is 40 minus 12 minus 7 = 21 feet, or 252 inches, giving seven rows at 36 inches. Seven rows of 27 is 189 seats.

That is the theoretical figure. Take five to ten percent off it for the AV position, the camera platform, the reserved front row and the two chairs that end up behind a pillar.

Egress and fire regulations

This is the section that matters. Theatre style puts the most people in a room with the fewest routes out of it, and the rules that govern it are not advisory.

The three constraints are aisle width, the number of seats a person must pass to reach an aisle, and the total travel distance to an exit. All three depend on the venue's occupancy classification, whether the chairs are loose or fixed together, and the local code the building is licensed under. A room set for 190 under one classification is set for 150 under another.

What this means practically: draw the layout, then send it to the venue and ask them to confirm it against their license before anything is promised to a client. Venues that host events regularly will do this in an afternoon, and they would far rather do it then than on the day.

Theatre vs classroom

Theatre seats roughly twice what classroom does in the same room. That is the entire argument for it, and it is a strong one right up until somebody needs to write something down.

The decision rule that has never let anyone down: if the session is under ninety minutes and nobody needs a surface, theatre. Otherwise classroom, and book a bigger room.

If there is food involved, neither is right - look at cabaret instead.

Setting the room in theatre style

1. 01Confirm the capacity with the venue

   Before any chair moves. Theatre is the one layout where the number you can set is a licensing question, and finding that out after the room is set is an expensive way to learn it.

2. 02Mark aisles and the perimeter

   Aisles at least 44 inches, perimeter walkway 42 inches, both taped down before setup starts. Aisles marked afterwards are always narrower than intended.

3. 03Set the front row and the sightline

   Front row 6 to 8 feet back from the stage edge. Sit in the end seat of the front row: if you are craning upward at the stage, move the whole block back a row.

4. 04Work back in measured rows

   Back of chair to back of chair, measured, not stepped out. Use a marked string line across the room for each row; eyeballed rows drift and the drift always eats the last row.

5. 05Gang the chairs and walk the exits

   Clip rows together if the capacity requires it, then walk every exit route from the furthest seat. If anything blocks it, move the thing, not the route.

Build it free

Draw the block to scale, check the seat count against what the venue will license, and settle the number before it is quoted to anyone. The free seating chart maker does it in a browser with no account.

For assigned theatre seating - where each chair carries a name - the same plan produces a guest page people can search, which removes the queue at the door.