How office space is calculated
Office planners start from the people and activities that will use the space, not from a rule like "200 square feet per person". This calculator follows a simple version of a professional space program: assigned space (desks and private offices) plus shared space (meeting rooms, reception, kitchen) gives the net area; circulation and support raise it to usable area; and the building's load factor converts usable to rentable area, which is what you pay for.
Rentable sq ft = (assigned + shared) × (1 + circulation %) × (1 + load factor %)
Workstation sizes
Open benching desks need about 40 – 50 sq ft each, standard 6×6 to 8×8 cubicles 36 – 64 sq ft, and large executive workstations 80 sq ft or more. Private offices typically range from 100 sq ft (small) to 150 – 200 sq ft (manager) and 250+ sq ft (executive). Hybrid teams that come in two or three days a week often provide desks for 60 – 80 % of staff and book them on demand.
Meeting and support space
Plan roughly 25 – 30 sq ft per seat in a conference room including the table and circulation – an eight-person room is about 200 – 250 sq ft. Phone booths for one person need 25 – 40 sq ft. Kitchens and break areas use 5 – 12 sq ft per employee, and you also need room for printers, storage, an IT closet and a mail area.
Usable vs rentable square feet
Usable square footage is the space inside your suite. Rentable square footage adds your share of the building's common areas – lobbies, corridors, restrooms and mechanical rooms. The ratio is called the load (or loss) factor and is usually 10 – 20 % in suburban buildings and 15 – 25 % in city towers. Two listings at the same price per square foot can therefore cost very different amounts for the same usable space.
| Office style | Typical rentable sq ft per person |
|---|
| Call center / dense open plan | 100 – 125 |
| Modern open office | 150 – 175 |
| Mixed open + private offices | 175 – 225 |
| Traditional private-office firm (law, finance) | 250 – 350 |
Understanding the rent
Commercial rent is quoted per square foot per year in the US (per month in some markets) and may be gross (operating costs included), modified gross or triple net (NNN), where you pay a share of taxes, insurance and maintenance on top. The calculator adds an operating expense line so you can model either. Don't forget fit-out costs, furniture, IT cabling, moving and deposits, which often equal six to twelve months of rent.
Tips before you sign
- Plan for growth over the whole lease term, but negotiate expansion or sub-lease rights instead of paying for empty desks.
- Ask for a test-fit floor plan from the landlord's architect before signing.
- Check the fire-code occupancy load and restroom capacity for your headcount.
- Confirm the HVAC hours, internet providers available in the building and after-hours access.
- Negotiate tenant improvement (TI) allowance and free-rent months – they are standard in most markets.
Frequently asked questions
How much office space per employee?
Most modern offices use 150 – 250 rentable square feet per employee including shared areas. Dense open plans can go down to about 100 – 125 sq ft.
What is the difference between usable and rentable square feet?
Usable is the area inside your suite. Rentable adds your share of building common areas through the load factor, typically 10 – 25 %.
How big should a meeting room be?
Allow about 25 – 30 sq ft per seat: a 4-person room is roughly 100 – 120 sq ft and an 8-person room 200 – 250 sq ft.
How do I calculate monthly office rent?
Multiply rentable square feet by the annual rate per square foot (plus operating expenses if the lease is net) and divide by 12.
How much space for hybrid work?
Hybrid offices often provide desks for 60 – 80 % of staff and add more meeting rooms and phone booths, cutting total space by 20 – 30 %.
About Footprint
Footprint is an independent, free office space planning calculator for startups, small businesses and facility managers. We are not a broker or landlord and do not receive referral fees.
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Last updated: October 28, 2026
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