About the Office Space Calculator
This office space calculator estimates how much floor area your company needs before you start touring buildings. Enter your headcount, how many people need private offices, the size of each workstation, how many meeting rooms you want and how much support space (reception, kitchen, storage, copy room) to allow per person. It adds a circulation allowance for corridors and aisles, then a load factor to convert usable area into the rentable square feet landlords quote.
It is built for founders signing a first lease, office managers planning a move or expansion, and teams switching to hybrid work who want to see how desk sharing shrinks the footprint. The result includes square feet per employee, the area in square meters, and an annual and monthly rent estimate at your local price per square foot.
Small meeting rooms are counted at 120 sq ft (about 4 seats) and conference rooms at 300 sq ft (about 10–12 seats). Circulation of 30–40% of the net area and a load factor of 10–20% are common planning assumptions, but every building differs — use the landlord’s measured load factor once you have it.
With the default inputs, the rentable area is 3,982 sq ft. Change any value above to recalculate instantly.
How to use the office space calculator
- 1Enter total headcount and how many people need private offices.
- 2Set office and workstation sizes, and lower desk sharing if your team is hybrid.
- 3Add the number of huddle rooms and conference rooms you need.
- 4Adjust support space, circulation and the building load factor if you know them.
- 5Enter local rent per square foot to see the yearly and monthly cost.
Formula and method
The calculator builds a space program from the bottom up. Private offices and open workstations are sized individually; open-plan desks are reduced by your desk-sharing ratio and rounded up to whole desks. Meeting rooms use fixed planning sizes (120 sq ft for a 4-person huddle room, 300 sq ft for a 10–12 person conference room), and support space is allowed per employee.
The total of those spaces is the net program area. A circulation percentage is added for internal corridors and aisles to get usable area — the space inside your suite. Finally the building load factor converts usable to rentable area, which includes your share of lobbies, restrooms and shared corridors and is the figure rent is charged on.
- S_o
- Private office size (sq ft)
- S_w
- Open workstation size (sq ft)
- S_s
- Support space per employee (sq ft)
- Sharing
- Desks provided per open-plan employee (100% = assigned desks)
- C
- Circulation allowance (fraction of net area)
- L
- Building load factor (fraction of usable area)
Worked examples
25-person office with 4 private offices
Four 150 sq ft offices (600) plus 21 desks at 50 sq ft (1,050), two huddle rooms (240), one conference room (300) and 15 sq ft of support per person (375) give a 2,565 sq ft net program. Adding 35% circulation gives 3,463 usable sq ft and a 15% load factor brings it to about 3,982 rentable sq ft — roughly 159 sq ft per person and $119,465 a year at $30/sq ft.
50-person hybrid team at 60% desk sharing
The 44 open-plan staff share 27 desks (44 × 0.6 = 26.4, rounded up). With six offices, four huddle rooms, two conference rooms and support space the net area is 4,080 sq ft, which grows to 5,508 usable and about 6,334 rentable sq ft — only 127 sq ft per person.
Small 10-person firm, larger cubicles
Two offices (300 sq ft), eight 64 sq ft cubicles (512), one huddle room (120) and 150 sq ft of support make 1,082 sq ft net. With 30% circulation and a 12% load factor the firm needs about 1,575 rentable sq ft, costing roughly $37,809 a year at $24/sq ft.
Frequently asked questions
How much office space do I need per employee?+
A common planning range is about 150–250 rentable sq ft per person for traditional layouts with some private offices, and roughly 100–150 sq ft for dense open-plan or hybrid offices with desk sharing. Your mix of offices, meeting rooms and amenities moves the number most.
What is the difference between usable and rentable square feet?+
Usable square feet is the space inside your suite that you actually occupy. Rentable square feet adds your pro-rata share of building common areas such as lobbies, restrooms and shared corridors. Rent is usually quoted per rentable square foot.
What is a load factor?+
The load factor (or add-on factor) is the percentage added to usable area to arrive at rentable area. If a building has a 15% load factor, a 2,000 usable sq ft suite is billed as 2,300 rentable sq ft.
How big should a conference room be?+
A common planning rule is roughly 25–30 sq ft per seat, which covers the table, chairs, space to move around them and room for a screen or credenza. That is why this calculator uses 120 sq ft for a 4-person huddle room and 300 sq ft for a 10–12 person conference room.
How does hybrid work change office size?+
If only part of the team is in on a given day, you can provide fewer desks than people. Setting desk sharing to 60% gives 6 desks per 10 open-plan employees, though hybrid offices often add more meeting and collaboration space.
Should I plan for growth?+
Yes. Leases often run 3–10 years, so many businesses size for the headcount they expect midway through the term. Enter your projected headcount to see how much extra space that requires.