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NNN Lease Calculator

Add base rent and the three "nets" — taxes, insurance, and CAM — to see your true effective rent and total occupancy cost.

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Effective Rent
per SF / year (base + the three nets)
Total Annual Cost
Total Monthly Cost

Estimates only. CAM, taxes, and insurance vary by lease and year; confirm actual figures with the landlord and your lease.

What is a triple net (NNN) lease?

In a triple net (NNN) lease — the standard structure for strip-mall and neighborhood retail — the tenant pays a base rent plus its pro-rata share of the property's three "nets": property taxes, insurance, and common-area maintenance (CAM). The quoted base rate is only part of the story; your true cost is the effective rent.

Effective Rent = Base + Taxes + Insurance + CAM

How to use this calculator

Enter the leasable square footage, the quoted base rent, and the three net charges — all on a per-square-foot, per-year basis. The calculator totals them into your effective rent and multiplies by your square footage to show total annual and monthly occupancy cost.

Why it matters

Tenants routinely underestimate occupancy cost by anchoring on the base rate alone. A $24 base with $12 in nets is really $36/SF. Knowing the effective rent up front lets you compare spaces honestly and budget accurately.

Frequently asked questions

What is included in CAM?

Common-area maintenance typically covers parking-lot upkeep, landscaping, lighting, snow removal, and shared-area repairs — billed to tenants by their share of the center.

How do I compare a NNN rent to a gross rent?

Add the nets to the NNN base to get an effective rent that is roughly comparable to a gross (all-in) quote.

Do the nets change over time?

Yes. Taxes, insurance, and CAM are reconciled periodically and can rise year to year, so treat them as estimates.

Want the full underwriting playbook?

Our free eBook, Strip Malls A to Z, breaks down every metric on this page and 20+ more essentials of neighborhood retail.