BizLeaseCheck

Triple Net (NNN) Lease Calculator

Calculate your true monthly rent including CAM, taxes, and insurance. Don't be fooled by the "Base Rent" number.

Tip: If you're also reviewing a lease, use Analyze to surface red flags and cost clauses.

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How to use this NNN calculator

  1. Enter base rent (monthly) and your rentable square footage.
  2. Add estimated CAM, property taxes, and insurance (monthly or annual equivalents).
  3. Compare the result to other locations using the same assumptions.

For the most reliable estimate, ask the landlord for the current CAM budget and last year's reconciliation.

NNN hidden-cost checklist

  • CAM definition: What’s included/excluded? Any management fee caps?
  • Capital items: Are roof/HVAC/parking replacements passed through? If so, are they amortized?
  • Taxes: How are reassessments and special assessments handled?
  • Insurance: Are deductibles (water/hail/flood) shifted to tenants?
  • Audit rights: Can you review statements and dispute charges?

Browse state-specific patterns in State Guides.

NNN calculator FAQs

BizLeaseCheck provides informational analysis and is not legal advice.