Business Rent Calculator

Commercial landlords quote rent per square foot per year, sometimes with triple-net expenses stacked on top, and leave the translation to you. This business rent calculator answers the question both ways: how much monthly rent your revenue can actually support, and what a quoted space really costs each month once every fee is added in. (If you are weighing leasing against buying the building, the business mortgage calculator prices the ownership side of that decision.)

Quick Answer

How to use the business rent calculator

Five inputs, one verdict. Results stay hidden until you calculate.

1. Monthly gross revenue: total sales before expenses, per month. Use a realistic average, not your best month. Digits only, no commas.
2. Target rent as % of revenue: the ceiling you are comfortable with. The example uses 8%. The tool rejects anything above 60% as unrealistic.
3. Space needed and quoted rent: the square footage you need and the landlord's annual rate per square foot. The example uses 2,000 sq ft at $24.
4. Additional monthly costs (optional): your manual allowance for NNN/CAM, utilities, insurance and other monthly extras. Leave it blank for none.
5. Click Calculate: the affordable monthly rent appears large at the top, with the monthly quote, the total monthly occupancy cost, the rent-to-revenue ratio, and the verdict badge underneath.

Bad inputs get plain-English rejections, not silent NaNs: blank revenue, zero or negative revenue, a zero target percentage, a target above 60%, blank or zero square footage, a negative quoted rate, and a negative or non-numeric additional cost each get their own message. When you are budgeting a new venture, fold the verdict into your startup cost calculator alongside the other launch expenses.

The two directions the tool answers

The calculator runs two questions at once, because signing a lease requires both answers. First, what your revenue supports: affordable monthly rent equals monthly gross revenue multiplied by your target percentage, divided by 100. Second, what the quote really costs: annual rent equals square feet multiplied by the quoted rate per square foot per year, divided by 12 for the monthly figure, plus your additional monthly costs. The rent-to-revenue ratio is the total monthly occupancy cost divided by revenue, times 100.

For the worked example: $90,000 × 8 ÷ 100 = $7,200 of affordable rent. The quote is 2,000 × $24 = $48,000 a year, ÷ 12 = $4,000 a month, plus $800 of extras = $4,800 total. The ratio is $4,800 ÷ $90,000 × 100 = 5.3%. Occupancy is one line among many in your operating budget; the business cost calculator keeps the rest of the lines honest.

Worked example, checked against the tool

A service business averages $90,000 a month in revenue and sets an 8% rent ceiling. It tours a 2,000 sq ft space quoted at $24 per sq ft per year, and estimates $800 a month for utilities and insurance on top. Every figure below is a real run of the calculator.

The verdict reads "Comfortable: well under typical ceilings" because 5.3% sits under the 6% line. Move the same $4,800 lease onto $40,000 of revenue and the ratio becomes 12%, flipping the badge to "Risky: above 10% of revenue" with identical dollars. That is why the ratio matters more than the rent figure alone.

Reading the verdict: rules of thumb, not lender standards

The badge bands come from industry practice, and they move by industry because margins do. Hedged properly, they look like this:

Published industry benchmarks put retail at 5 to 10%, restaurants at 6 to 10%, office and professional services at 5 to 8%, medical at 4 to 6%, and gyms at 8 to 12%, with broader guides stretching the small-business range to 6 to 15% depending on the trade. Treat every one of these as a rule of thumb for screening, never as a lender standard: two businesses with the same ratio can have very different payroll, inventory and debt loads, and landlords underwrite the tenant, not the benchmark.

What a quote hides: the triple-occupancy-costs caveat

A commercial quote is rarely the whole cost, which is why the additional-costs field exists. Read it as three questions before you trust any number:

• Gross or triple net? A gross lease bundles most expenses into the rate; a triple net (NNN) lease charges property taxes, building insurance and maintenance on top of the base rate. The same headline number can mean very different total costs, and NNN charges often add $5 to $10 per square foot.
• Rentable or usable? Rentable square footage includes your share of hallways, restrooms and lobbies; usable square footage is the space you actually occupy. Landlords usually quote on rentable, so confirm which figure your quote uses before you enter it.
• Your allowance, not the tool's math: the additional-costs field is a manual estimate you type in. The calculator does not compute CAM, tax or insurance passthroughs from the quote; it adds your number to the monthly quote. Estimate high on NNN leases and ask the landlord for the last two years of actual CAM charges.

Also note the denominator: the tool uses gross revenue, not profit. Profit swings with everything else you do; revenue is the stable denominator, and it is the one landlords and brokers quote against too.

Escalations compound, so model them

Most commercial leases raise the rent on anniversaries, commonly 2 to 4% a year on US commercial leases, and the increases compound on each other. A 3% annual bump on the worked example's $4,800 turns into about $5,402 by year five: four increases on a five-year lease, because you pay the starting rent for the full first year. Our lease escalation calculator projects the full schedule for any rate and term, including the common trap of counting five increases instead of four.

Lease it or buy it

At some point every growing business asks whether the rent check should become a mortgage payment. The math that matters is the total monthly occupancy cost from this calculator against the monthly payment, fees and effective APR on the ownership side. Ownership converts rent into equity and freezes the payment for up to 25 years under SBA programs, but it ties up the down payment and adds maintenance, taxes and insurance you used to split with a landlord. There is no universal right answer: compare the two monthly numbers honestly, then decide which balance sheet you want.

What competing calculators miss

Commercial rent tools cluster around the quote, and almost none of them ask about your revenue:

• Quote-to-cost tools (SmartBizCalc's commercial lease calculator): the strongest of the breed: NNN expense breakdowns, escalation modeling, and a real industry benchmark table. What is missing is the other direction: it never asks what your revenue can support, so a "cheap" space on a thin-revenue business passes unchallenged.
• Broker explainers with calculators (the Cauble Group's lease calculator): excellent plain-English teaching on base-plus-NNN quoting with worked numbers. No affordability check, no verdict, no revenue input at all.
• Benchmark guides (Atrium Properties' 2026 rent-to-revenue piece): honest about the ratio being a screening metric rather than a pass-or-fail test, with the formula worked. No interactive tool and no quote translation.
• How-to guides (BFPM's commercial rent guide): useful on rentable versus usable space and CAM charges, with a 6 to 15% industry range. A guide, not a calculator.
• Formula pages (CFM Calculator): the annual and monthly rent formulas plus a rental agent's fee computation. Landlord-side math with no tenant affordability angle.
• Definition pieces (the Tech Edvocate's commercial rent explainer): a clean NNN worked example, but no tool and nothing on revenue.
• The gap this page fills: both directions in one tool: revenue to affordable ceiling, and quote plus extras to true monthly cost, with a live verdict badge and the honest caveat that the extras are your estimate, not computed CAM.

Frequently asked questions

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