Commercial rent is quoted in a way that confuses almost everyone the first time, and this free lease calculator turns the quote into a real monthly number. Enter the square footage, the base rate, and the NNN expenses, and you get your true rent.
The trap is that a rate like $20 per square foot plus NNN is not your rent. You have to add the triple net expenses and do the math on your actual square footage. Here is the tool, then how the quote really works.
How commercial rent is quoted: usually as an annual rate per square foot, often plus NNN (triple net) expenses for taxes, insurance, and maintenance. Your real cost is base rate plus NNN, times your square footage.
Quick math: 2,000 square feet at $20 per foot base plus $6 NNN is 2,000 times $26, or $52,000 a year, about $4,333 a month.
How to Calculate Your Commercial Rent
Take your square footage, multiply by the base rate per square foot, and add the NNN expenses per square foot times the same square footage. Divide by twelve for the monthly number. The calculator does all of this once you plug in the three inputs.
The single biggest thing to confirm is what is included. A gross lease bundles most expenses into the rate, while a triple net (NNN) lease charges you taxes, insurance, and maintenance on top of the base rate, so the same headline number can mean very different total costs. I explain how the quoting works in this video.
Watch: How to Calculate Commercial Rent [Price Per Square Foot Simplified]
Know Your Lease Type Before You Sign
The lease structure changes your real cost more than the base rate does. Under a gross or full-service lease the landlord covers most operating expenses, while under a NNN lease you pay them separately, and a modified gross lease sits somewhere in between. Always ask what the NNN or additional rent runs per foot before you compare two spaces, because a lower base rate with high NNN can cost more than a higher gross rate. I break down all the structures in my guide to NNN, gross, and modified gross leases.
Commercial Lease Calculator FAQ
How is commercial rent calculated?
Multiply your square footage by the base rate per square foot, add the NNN expenses per square foot times your square footage, and divide by twelve for the monthly rent.
What does NNN mean in a lease?
NNN, or triple net, means you pay the three nets (property taxes, insurance, and maintenance) on top of your base rent, rather than having them bundled into the rate.
What is the difference between gross and NNN rent?
A gross lease bundles most operating expenses into one rate, while a NNN lease charges base rent plus those expenses separately. Always compare the all-in cost, not just the base rate.
How do I convert annual rent to monthly?
Multiply your square footage by the all-in rate per square foot to get the annual rent, then divide by twelve for the monthly payment.
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Explore CRE CentralLearn the lease structures cold with my guide to NNN vs gross vs modified gross leases, or see all the commercial calculators.