How big should a wedding dance floor be?

“Aim for” is the guest count × 0.3 m². “Hire size” is the smallest common hire floor that covers it. Below the “cramped” figure (70% of the aim) people spill off the edges and the floor feels full from the first song. “Bars” is one per 100 guests, so the queue doesn't empty the dance floor.

Where the 0.3 m² comes from

At a typical wedding, around a third of your guests are dancing at any one time: more for the first few songs after the first dance and at the end of the night, fewer while the buffet is out. Each dancer needs a little under a square metre to move without treading on anyone. A third of your guests × 0.9 m² each is 0.3 m² per guest.

Use your evening headcount, not the day guests. If 80 come to the wedding breakfast and 140 to the evening do, plan the floor for 140.

Go up a size if…

• You're having a ceilidh or barn dance. Sets of dancers in long lines need far more room than a disco crowd; ask your caller how many sets they'll run and let them size the floor.
• Your crowd will all dance. Lots of friends in their twenties and thirties, a great band, a free bar: the third becomes a half.
• There's a band rather than a DJ. People gather in front of the band, so the floor fills from one end.

…and down a size if

• Many guests are older or have young children, and the evening is more about conversation.
• The floor is a built-in feature you can't shrink: instead, bring the tables closer around it.

Too big is a real problem too. A floor more than about 2.5 times the recommended size looks empty, and an empty floor is hard to be the first on. The planner flags both ends.

Hire floor sizes

Portable dance floors are built from square panels, usually 3 ft (about 0.9 m) across, so real floors come in steps of roughly 0.9 m. The common sizes in the planner are 3 × 3, 4 × 4, 5 × 5, 6 × 6, 7 × 7 and 8 × 8 m, plus 4 × 6 and 5 × 7 m for long rooms. If your hire company quotes in feet, 12 × 12 ft is about 3.7 m square and 18 × 18 ft about 5.5 m.

White or black gloss floors show up beautifully in photos but mark easily; wood-effect suits barns. It doesn't change the size you need.

The space around the floor

The floor itself is the easy bit. What makes a room work is the space between everything else. These are the rules of thumb the planner checks as you go:

• 1.5 m between tables (edge to edge), so two guests can push their chairs back at the same time. Below 1.2 m, chairs bump.
• A chair takes about 0.55 m behind the table edge once someone's sitting in it.
• 1.2 m walkways around the room and to the bar, and never less than 0.9 m, so staff can carry plates past seated guests.
• 1.2 m kept clear in front of every door and fire exit.
• One bar per 100 guests. Put it near the floor but not on its edge, or the queue becomes the dance floor.

These are planners' rules of thumb for exploring a layout, not a fire-safety check. Your venue's own capacity and exit rules always win, so share your plan with them before you book the hire.

Where to put the dance floor

• In sight of the top table, so everyone can watch the first dance without standing on chairs.
• With the band or DJ on one edge, near a power point, and away from grandparents' tables.
• Out of the main walkway from the door to the bar and the loos, so people aren't crossing it all night.
• Centred in a ballroom with rounds all around (everyone's close to it), or at the far end of a barn or hall, with banquet rows in front.