Commercial Lease Calculator
Estimate the monthly and total cost of a commercial lease, covering NNN, modified gross, full-service gross, and percentage leases.
| Space Type | Typical Rent Range |
|---|---|
| Office (Full-Service Gross) | $25 – $45 / sq ft / yr |
| Office (Modified Gross) | $20 – $38 / sq ft / yr |
| Retail, In-Line Strip Center (NNN) | $15 – $35 / sq ft / yr |
| Retail, High Street / Mall (NNN) | $40 – $100+ / sq ft / yr |
| Industrial / Warehouse (NNN) | $5 – $12 / sq ft / yr |
| Flex / R&D Space (NNN) | $10 – $20 / sq ft / yr |
| Restaurant Space (Percentage Lease) | $25 – $50 base + 4–8% of sales |
| Medical Office | $22 – $40 / sq ft / yr |
Ranges are general market guidance in USD, not a quote. Location, building class, and local market conditions move real rents significantly.
Tenant pays base rent plus their share of property taxes, insurance, and CAM separately.
Common area maintenance, property taxes, and insurance passed through to the tenant.
A common move-in concession, applied against your first year's rent.
Optional. Landlord's build-out contribution, factored into your net effective rent.
₹7,000 base rent + ₹2,125 CAM, taxes & insurance
₹1,09,500
₹5,63,100
₹9,385
₹35/sqft
Year-by-Year Lease Cost
Commercial Lease Calculator: Know Your Real Rent Before You Sign
Commercial rent almost never comes as one simple number. A landlord quotes a base rent per square foot, then adds CAM charges, property taxes, insurance, escalations, and sometimes a cut of your sales, and suddenly the number on the lease page looks nothing like what actually leaves your bank account every month. This free commercial lease calculator untangles all of that. Enter your space, your lease type, and your charges, and it gives you a clear monthly cost, a full year-by-year schedule, and the true total cost of the lease over its entire term.
Whether you're renting an office, a retail storefront, a warehouse, or restaurant space, this calculator handles the major commercial lease structures used across the industry: triple net (NNN), modified gross, full-service gross, and percentage leases. You get real numbers, not a rough guess, before you sign anything.
The Four Main Types of Commercial Leases
A triple net lease, usually written as NNN, is the most common structure for retail and industrial space. The tenant pays a base rent plus their share of the three "nets": property taxes, building insurance, and common area maintenance, all billed separately from the base rent. NNN leases usually quote a lower base rent per square foot because these extra costs are unbundled and added on top.
A modified gross lease sits in the middle. Base rent includes some operating costs, and the landlord and tenant split or negotiate the rest, often CAM stays with the landlord while taxes and insurance get passed through, or some other split entirely, depending on the deal. A full-service gross lease is the simplest to budget: one quoted rent covers everything, taxes, insurance, and CAM, and the tenant writes one check a month with no surprises. A percentage lease, common in retail and restaurant space, adds a twist: base rent plus a percentage of gross sales once the tenant crosses an agreed sales breakpoint, giving the landlord some upside if the business does well.
How to Use This Commercial Lease Calculator
Start by picking your lease type at the top, since this decides whether the additional charges section even applies. Enter your square footage and your base rent, and choose whichever format matches your lease document, dollars per square foot per year, per square foot per month, or a flat total monthly figure. All three do the same math underneath, just in the format your landlord actually quoted you.
If you're on an NNN or modified gross lease, fill in your CAM, property tax, and insurance figures per square foot per year, these get added to your base rent automatically. Set your lease term in years and your expected annual rent escalation, most commercial leases bump rent 2 to 4 percent a year, sometimes more in hot markets. If your landlord offered free rent as a move-in incentive, enter the number of months and the calculator applies that value against your first year automatically. Add a tenant improvement allowance if one was negotiated, since this build-out contribution effectively lowers your real cost of occupancy over the lease term.
Base Rent vs Additional Charges: Why the Split Matters
The quoted base rent on a lease listing is often just the starting point, not the full story. On an NNN lease, a $20 per square foot base rent can easily turn into $28 or $30 once CAM, taxes, and insurance are layered on top. This is exactly why comparing two lease offers by base rent alone is a common and costly mistake, a lower headline number on an NNN lease can end up costing more than a higher all-in number on a full-service gross lease at a different building.
This calculator forces that comparison to happen properly by always showing you the full stacked cost, base rent plus every additional charge, as one clear monthly and annual figure. That's the number that actually matters when you're deciding what you can afford.
Understanding CAM, Property Taxes, and Insurance
Common area maintenance, or CAM, covers the shared spaces of a property, parking lot upkeep, landscaping, snow removal, common area utilities, cleaning, and property management fees. In a multi-tenant building, CAM is usually split among tenants based on their share of the total leasable square footage, so a bigger space pays a proportionally bigger CAM bill.
Property taxes and building insurance are usually passed through to tenants on NNN and many modified gross leases, again typically prorated by square footage. These three charges together often add anywhere from $3 to $12 or more per square foot per year depending on the market and property type, which is exactly why this calculator asks for them separately rather than folding them into one vague "extra costs" number.
Rent Escalations: The Cost That Compounds Quietly
Almost every multi-year commercial lease includes an annual rent escalation, a scheduled increase applied each year of the term. A modest 3 percent annual bump doesn't sound like much in year one, but compounded over a 5 or 10-year lease, it meaningfully raises your total cost of occupancy, and a lot of tenants underestimate this until they see the full schedule laid out.
This calculator applies your escalation rate to both base rent and additional charges for every year of your term, then shows you the year-by-year breakdown in the chart above, so you can see exactly how much your rent climbs by year 3 or year 5, not just what you'll pay this year.
Free Rent, Tenant Improvement Allowances, and Effective Rent
Landlords often sweeten a deal with concessions rather than lowering the headline rent, since a lower quoted rent looks worse on their own books over the life of the building. The two most common concessions are free rent, a set number of months where no rent is due, usually at the start of the lease, and a tenant improvement (TI) allowance, a cash contribution toward building out the space to suit your business.
Both concessions genuinely reduce your real cost of occupying the space, even though the lease document still shows the full base rent. This calculator factors both in: free rent value comes straight off your year-one total, and your TI allowance is subtracted from total lease cost when calculating your net effective rent per square foot per year, which is the single most honest number for comparing two very different lease offers side by side.
Percentage Leases and Retail Rent Structures
Retail landlords, especially in shopping centers and malls, often use percentage leases to align their income with how well a tenant's business actually performs. The structure sets a base rent, usually lower than a comparable straight lease, plus a percentage of gross sales once the tenant crosses a set sales breakpoint for the year.
Turn on the percentage rent option in this calculator, enter your expected annual gross sales, your breakpoint, and the agreed percentage rate, and you'll see exactly how much additional rent kicks in once you clear that threshold. This is especially useful when comparing a percentage lease offer against a flat NNN deal at a different location, since the real cost of a percentage lease depends heavily on how strong sales actually turn out to be.
A Simple Worked Example
Picture a 3,000 square foot retail space on a 5-year NNN lease. Base rent is quoted at $28 per square foot per year, with CAM at $4.50, taxes at $3.20, and insurance at $0.80, all per square foot per year. That works out to a year-one base rent of $84,000 and additional charges of $25,500, for a total first-year rent of $109,500, or roughly $9,125 a month, well above the $7,000 a month a tenant might have assumed from the base rent alone.
Add a 3 percent annual escalation over the 5-year term, 2 months of free rent as a move-in concession worth about $18,250, and a $15 per square foot tenant improvement allowance worth $45,000, and the total lease cost over 5 years comes out well over half a million dollars, while the net effective rent, after accounting for the TI allowance, lands noticeably lower than the sticker rent per square foot. That's the real number a tenant should be budgeting against, not the number printed on the first page of the lease.
Common Mistakes Tenants Make When Budgeting a Lease
The single biggest mistake is comparing two spaces using base rent alone, ignoring that one is NNN and the other is full-service gross, which makes an apples-to-oranges comparison look like it's apples-to-apples. Another common slip is forgetting escalations entirely and budgeting only for year-one rent, which leaves a business unprepared when the rent bump hits in year two or three.
Tenants also frequently overlook that free rent and TI allowances are one-time benefits concentrated early in the lease, not a permanent discount, so the true monthly cost in year three or four is meaningfully higher than what showed up on the move-in paperwork. Running the full year-by-year schedule through a calculator like this one, before signing, catches every one of these gaps.
Negotiating Points This Calculator Can Help With
Once you can see the full picture, base rent, additional charges, escalation, and concessions, all laid out together, it becomes much easier to spot where there's room to negotiate. A landlord might hold firm on base rent but have flexibility on the escalation rate, the length of a free rent period, or the size of a TI allowance. Running a few different scenarios through this calculator, tweaking one variable at a time, quickly shows you which concession actually moves the needle most on your total lease cost.
It's also a useful tool mid-negotiation: if a landlord counters with a higher base rent but a bigger TI allowance, plug both scenarios in and compare the net effective rent and total lease cost side by side, rather than trying to do that math in your head across a conference table.
Frequently Asked Questions
How do you calculate commercial lease cost?
Multiply your rent rate by your square footage to get base rent, then add any pass-through charges like CAM, property taxes, and insurance if you're on an NNN or modified gross lease. Divide by 12 for a monthly figure. This calculator does all of that automatically, plus applies rent escalations and concessions over your full lease term.
What is a triple net (NNN) lease?
A triple net lease is a commercial lease where the tenant pays base rent plus their share of property taxes, building insurance, and common area maintenance (CAM), all billed separately. It's the most common structure for retail and industrial space and usually quotes a lower base rent than a gross lease since these extra costs are unbundled.
What's the difference between gross rent and net rent?
Gross rent (full-service gross) is one all-in number that already includes taxes, insurance, and CAM, so tenants write one check with no surprises. Net rent (NNN) is a lower base rent with those costs billed separately on top, so the real all-in cost often ends up similar or higher once everything is added together.
What is CAM in a commercial lease?
CAM stands for common area maintenance, the shared costs of running a property's common spaces, things like parking lot upkeep, landscaping, snow removal, cleaning, and common area utilities. In multi-tenant buildings, CAM is typically split among tenants based on their share of the building's total square footage.
What is a typical rent escalation rate for commercial leases?
Most commercial leases include an annual escalation between 2% and 4%, applied to base rent (and sometimes additional charges) each year of the lease term. Some markets or lease types use higher fixed bumps, or tie escalations to a published index like CPI instead of a flat percentage.
How does free rent affect my total lease cost?
Free rent is a concession where the landlord waives rent for a set number of months, usually at lease start, to help offset move-in and build-out costs. It reduces your effective first-year cost but doesn't change the rent rate on paper. This calculator subtracts the value of your free rent months directly from your year-one total.
What is a tenant improvement (TI) allowance?
A TI allowance is a cash contribution from the landlord, usually quoted per square foot, toward building out or renovating the space to suit the tenant's business. It effectively lowers the tenant's real cost of occupancy over the lease term, which is why this calculator factors it into your net effective rent figure.
What is a percentage lease?
A percentage lease is common in retail and restaurant space. The tenant pays a base rent plus a percentage of gross sales once sales cross an agreed breakpoint for the period. It lets the landlord share in a tenant's success while usually offering a lower base rent than a comparable straight lease.
How much does commercial rent typically cost per square foot?
It varies enormously by property type and location. Industrial and warehouse space often runs $5 to $12 per square foot per year, office space commonly runs $20 to $45, and prime retail can run well above $40 to $100 or more. See the benchmark table above for typical ranges by space type.
What is net effective rent and why does it matter?
Net effective rent is your total lease cost, after subtracting concessions like a tenant improvement allowance, spread evenly across your square footage and lease term. It's the most honest number for comparing two different lease offers, since a lower headline rent with fewer concessions can end up costing more than a higher headline rent with strong concessions attached.