How Much Office Space Do You Need? Calculator and 2026 Benchmarks
The U.S. average is about 117 sq ft per worker, but that number will mislead you. Size your requirement in both usable and rentable square feet with the free calculator.
Most teams get this number wrong in the same two ways — and both make the space you need bigger than a headcount-times-square-feet estimate suggests. Start with the calculator, then read the two reasons below it.
This is a planning range, not a specification. The real number depends on the specific floor plate, column placement, and egress capacity. A test fit turns a range into a requirement.
Why your number is bigger than you expected
If that figure came out higher than the back-of-envelope math you'd already done, it's almost certainly one of these two reasons. Both are worth understanding before you tour anything.
You pay rent on more space than you can use
This is the one that catches almost everyone. There are two square footage numbers in every office lease, and the bigger one is the one you pay for:
The space inside your four walls. What you can actually put desks in.
Your usable space plus your share of the lobby, hallways, restrooms, and mechanical rooms.
The multiplier between them is called the load factor, and it typically runs 1.15 to 1.25 in office buildings.3 A 1.20 load factor means you pay for 20% more space than you can furnish. That's normal and not a scam — shared space has to get allocated somehow. It just has to be in your budget from day one.
You need 8,000 usable SF. The building has a 1.20 load factor, so your lease says 9,600 RSF. At $38/SF:
Over five years: $304,000. Ask any landlord to show you how their load factor was calculated, and ask that the rentable figure be locked for your initial term — most leases call it "approximate," which leaves you little recourse later.4
Rooms and hallways cost more than desks
Desks are the cheap part. What actually drives your footprint is everything around them — and two line items in particular get left out of quick estimates:
Corridors and walking space aren't optional and aren't included when you add up rooms. They add roughly 25–35% on top of everything else. Leave this out and every number you produce is short by a quarter.
A private office runs ~120 SF — more than two open desks. One conference room is ~250 SF. Add a boardroom and you've added the equivalent of eight desks. Try toggling those inputs above and watch the total move.
If you're hybrid, size to your busiest day, not your headcount. A 50-person team where 60% come in on a typical day needs about 30 desks, not 50.2 One caveat: if your policy says three days but everyone shows up Tuesday, your real peak is much higher. Use badge or booking data, not the policy.
You've got a number. What does it cost?
Tell us your square footage, market, and timeline. We match you with one local tenant rep broker who specializes in your property type — and the landlord pays their commission, not you.
Sanity check: space by team size
Rentable square feet, which is what you'll see on a listing. Low end is hybrid on an efficient layout; high end is fully in-office with several private offices.
| Team | Lean | Typical | Generous |
|---|---|---|---|
| 5 people | ~600 SF | ~900 SF | ~1,300 SF |
| 10 people | ~1,200 SF | ~1,600 SF | ~2,200 SF |
| 25 people | ~2,500 SF | ~3,500 SF | ~5,000 SF |
| 50 people | ~4,800 SF | ~6,500 SF | ~9,500 SF |
| 100 people | ~9,000 SF | ~12,500 SF | ~18,000 SF |
Planning ranges, rounded. For context, the U.S. average is about 117 SF per worker, down from roughly 225 SF in 2010.1
Notice the per-person number falls as teams grow. A 5-person office still needs a reception area, a kitchen, and a conference room — the same fixed overhead a 25-person office needs, spread across fewer people. That's why flat per-employee figures give bad answers at both ends.
Four mistakes worth avoiding
You calculate 4,000 SF, tour a "4,000 SF" suite, and it feels small. It is — you compared two different measurements. Convert before you shortlist.
You'd pay rent, operating expenses, and annual escalations on empty space for the whole term. Cheaper: lease what you need and negotiate a right of first refusal on the space next door. That's a lease clause, not extra rent.
It doesn't — exit capacity and restroom fixture counts do. A plan for 120 people in a suite built for 70 fails plan review, and that's a much more expensive discovery after signing than before.
Getting a raw suite to your layout costs money. Landlords often contribute a tenant improvement allowance — office TI commonly runs $30–$70/SF, higher in high-vacancy markets — but anything past the allowance is yours.5
Frequently asked questions
Ready to turn that number into a shortlist?
A calculator gets you a range. A local tenant rep broker gets you a test fit, real comparable rents in your submarket, and a negotiated deal — and in most U.S. markets the landlord pays their commission, so there's no direct cost to you. TenantBase is a technology platform, not a brokerage: share your requirements once and get matched with one vetted local specialist instead of becoming a lead sent to eight agents.
- Density. The Most Important Metric in Corporate Real Estate — U.S. average space per worker ~117 SF, down from ~225 SF in 2010.
- Othership. Calculate the Number of Desks Needed for Hot Desking in an Office — peak-occupancy planning for hybrid environments.
- CommercialCafe. What Is Loss Factor in Commercial Real Estate? — load factors typically 1.15–1.25; loss factors 15–30%.
- Coy Davidson, The Tenant Advisor. Understanding the Common Area Factor — measurement stipulation and load factor documentation.
- Cauble, Tyler. What Is a TI Allowance in Commercial Real Estate? — office TI typically $30–$70/SF as of 2026.
This post and calculator are for informational and planning purposes only and do not constitute legal, financial, architectural, engineering, or real estate advice. Occupancy load, egress, accessibility, and fixture requirements vary by jurisdiction and building and must be confirmed with qualified professionals and the local authority having jurisdiction. Commission structures vary by market; confirm local customs with your advisor and legal counsel. TenantBase, Inc. is a technology platform and does not provide real estate brokerage services; partner brokers are independent licensed professionals.