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

> An office seat capacity calculation starts from a known carpet area and works backwards: it sets aside circulation, then meeting rooms, cabins and support spaces, and divides what remains by the area one workstation needs. The result is how many desks a floor can hold and, with hybrid working, how many people those desks can serve.

## 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

| Assumption | Default | What it covers |
| --- | --- | --- |
| Area per workstation | 45 sq ft | Desk, chair and the space to pull the chair out |
| Circulation | 25% | Corridors and walkways, added on top of net area |
| Meeting rooms, cabins and support | 30% of net area | Every space that is not an open-plan desk |
| Peak attendance | 100% | One seat for every person |

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:

| Step | Calculation | Result |
| --- | --- | --- |
| Net area | 5,000 ÷ 1.25 | 4,000 sq ft |
| Circulation | 5,000 − 4,000 | 1,000 sq ft |
| Meeting rooms, cabins and support | 4,000 × 30% | 1,200 sq ft |
| Workstation zone | 4,000 × 70% | 2,800 sq ft |
| Seats | 2,800 ÷ 45 = 62.2, rounded down | 62 |
| Area used by seats | 62 × 45 | 2,790 sq ft |
| Carpet area for each seat | 5,000 ÷ 62 | 81 sq ft |
| Headcount at 100% attendance | 62 ÷ 100% | 62 |

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.

## Frequently asked questions

### How many workstations fit in 5,000 sq ft of carpet area?

With the default allowances, 25% circulation, 30% of the net area for meeting rooms, cabins and support, and 45 sq ft per workstation, 5,000 sq ft of carpet holds 62 workstations. That is about 81 sq ft of carpet for each seat. A layout heavy on meeting rooms holds fewer; a compact open-plan floor holds more.

### Should I enter carpet area or the chargeable area the landlord quotes?

Enter carpet area, the floor inside your tenancy that can actually be furnished. Chargeable or super built-up area includes a share of lobbies, lifts and other common areas, so using it overstates the seats. If you only have the chargeable figure, convert it with the carpet area calculator first.

### How does peak attendance change the headcount?

At 100% every person has their own seat, so headcount equals seats. If only 70% of the team is in on the busiest day, each seat serves about 1.4 people and 62 seats serve a team of 88. Use the attendance on the busiest day, not the average, or there will be days when people cannot find a desk.

### Is the seat count the legal maximum for the floor?

No. It is a planning figure based on how much space each desk takes. The number of people a floor may hold for fire safety is set by the occupant load and the exit capacity, which the fire consultant checks against NBC 2016 Part 4 for the actual building and layout.

### Why is 45 sq ft used for each workstation?

It allows for a typical desk, the chair and the space to pull the chair out, and it matches the office space planner so the two tools agree. Aisles are covered separately by the circulation allowance. Compact benching needs less; large executive desks or L-shaped workstations need more, so change it to suit your furniture.

## Sources

- [NBC 2016, Part 4](https://www.bis.gov.in/standards/national-building-code/?lang=en) — Fire and life safety: occupant load and means of egress

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Source: https://hagerstone.com/calculators/office-seat-capacity-calculator