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NNN Lease Calculator

Enter your base rent, square footage, and monthly NNN expenses to calculate your true total occupancy cost: monthly, annually, and per square foot.

What is a triple net (NNN) lease? Under a NNN lease you pay base rent plus three additional operating expenses: property taxes, building insurance, and common area maintenance (CAM). This calculator combines all five inputs to show your true total occupancy cost.

Lease & Expense Details
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Total Occupancy Cost

Enter your lease details above to calculate total occupancy cost.

Related NNN lease guides

Once you know your total occupancy cost, the next step is verifying the NNN expense components against your year-end reconciliation statement. CAM, taxes, and insurance all change each year, and overcharges in any one of them inflate your effective rent.

  • What Is CAM Reconciliation?
  • Triple Net Lease CAM Charges Explained
  • What Is a CAM Audit?

Frequently Asked Questions

What does NNN mean in a lease?
NNN stands for triple net. In a triple net lease, the tenant pays base rent plus three additional expenses: property taxes, building insurance, and common area maintenance (CAM) costs. These pass-through expenses are on top of your base rent, making your total occupancy cost higher than the headline rent rate.
What is a typical NNN expense amount?
NNN expenses typically range from $3 to $12 per square foot per year depending on property type, location, and age. Retail in high-traffic areas and older buildings tend toward the high end. Your landlord provides estimated NNN amounts annually, but the actual amounts are reconciled at year-end.
Can my landlord increase NNN expenses?
Yes. Property taxes, insurance premiums, and CAM costs change each year. Your lease may cap CAM escalation (a CAM cap) but taxes and insurance are usually uncapped. Use CAMAudit's reconciliation checker to verify the math on your year-end statements.

Next Best Step

Know your true NNN occupancy cost, then check for overcharges

NNN leases hide overcharges in the CAM, tax, and insurance pass-throughs. The audit surfaces them.

NNN lease tenant guide

Understand what landlords can and cannot pass through in a triple-net lease.

See a sample report

Preview how the audit documents NNN overcharges.

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Upload your NNN reconciliation to check for itemized overcharges.

Ready to skip the reading and document the overcharge directly?

Find My Overcharges

Other Free Tools

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Related Resources

How It WorksHow CAMAudit WorksSample ReportPreview a Full Audit ReportFree ToolPro-Rata Share Calculator
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Recovery of past CAM overcharges depends on your specific lease terms, including any audit rights deadlines or ‘binding and conclusive’ provisions, and on applicable state law.

State statute of limitations periods apply to written contracts and range from 3 to 10 years. Your actual lookback window may be shorter based on your lease.

CAMAudit is a document analysis platform, not a law firm, and nothing on this site constitutes legal advice. Consult a licensed real estate attorney before initiating any dispute or legal proceeding.

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