Office Seat Capacity Calculator: How Many People Fit in a Floor?

What it calculates

The office space planner asks how much area a team needs. This calculator asks the reverse: given a floor, how many people can it seat? It is the question that comes up when a landlord offers a specific floor, when a team is growing inside its current office, or when a company is deciding whether hybrid working lets it stay where it is.

From the carpet area it gives:

• the number of workstation seats the floor can hold;
• the carpet area for each seat, including a share of every other space;
• the headcount those seats can serve at a chosen peak attendance;
• a breakdown of where the carpet area goes.

Inputs

Carpet area is the usable floor inside the tenancy, in square feet. It excludes walls, the building core, lift lobbies and other common areas.

Share of net area for meeting rooms, cabins and support is the part of the floor, after circulation, that is not open-plan desks. It covers meeting rooms, boardrooms, cabins, reception, pantry, the IT room, storage and print areas. A sales or operations floor might be around 20%; a floor with many meeting rooms and leadership cabins can be 40% or more.

Peak attendance is optional. Leave it at 100% if every person has their own desk. For hybrid working, enter the share of the team in the office on the busiest day.

The assumptions panel holds the area per workstation and the circulation allowance.

Method

The calculation removes circulation first, then the support spaces, then counts desks in what is left:

1. Net area = carpet area ÷ (1 + circulation allowance).
2. Workstation zone = net area × (1 − share for meeting rooms, cabins and support).
3. Seats = workstation zone ÷ area per workstation, rounded down.
4. Carpet area for each seat = carpet area ÷ seats.
5. Headcount served = seats ÷ peak attendance, rounded down.

Circulation is defined the same way as in the office space planner, where carpet = net × (1 + circulation). Dividing by (1 + circulation) here simply runs that step backwards, so the two tools give consistent answers. Seats are rounded down because a part of a desk is not a desk.

Assumptions

These are planning allowances, not standards. Change them to suit your furniture and the way your team works.

Limitations

• No layout is drawn. Columns, the core, a deep or narrow floor plate and the window line all change how many desks really fit. Two floors with the same carpet area can seat noticeably different numbers.
• Support space is a percentage. A fixed list of rooms is better handled by the office space planner, which counts each room.
• Seats are not occupant load. The calculator does not check fire escape, exit widths, travel distances or the occupant load the floor is allowed. The fire consultant checks those under NBC 2016 Part 4 for the actual building.
• Building services are not checked. More people means more fresh air, cooling, power and washroom use. The building's design limits for these should be confirmed before a floor is densified.

Worked example

A floor with 5,000 sq ft of carpet area, 30% of the net area for meeting rooms, cabins and support, and the default assumptions:

The 10 sq ft left in the workstation zone is too small for another desk, so it stays as a little extra space. The carpet area of 5,000 sq ft is about 464.5 m².

If the team works hybrid and 70% of people are in on the busiest day, the same 62 seats serve a team of 88 (62 ÷ 0.7 = 88.6, rounded down). If instead the floor needs more meeting rooms and the support share rises to 40%, the workstation zone falls to 2,400 sq ft and the floor holds 53 seats.

How engineers use it

A designer uses a capacity check when a client is weighing up a specific floor. It turns the landlord's carpet area into a seat count in minutes, so the client can see straight away whether a floor is worth a closer look. Running it with a few support percentages shows the cost of each extra meeting room in desks, which is often the clearest way to settle a debate about the room list.

The next step is a test fit: a quick layout on the real floor plate. The test fit shows where the columns and core fall, whether cabins can sit along the window line, and how many desks really fit. The seat count from the test fit then feeds the next checks, such as the cooling load, fresh air, power and data points, and the fire consultant's occupant load and exit review.

When a professional design must replace it

Use the calculator to compare floors, test hybrid scenarios and sense-check a seat count you have been given. Replace it with a designer's test fit before you sign a lease, and with a full layout before you order furniture or start any work. The test fit is where the seat count is confirmed against the real floor plate, and where the fire consultant checks the occupant load and exits under NBC 2016 Part 4.