CAM Charges Calculator

A Common Area Maintenance (CAM) charges calculatoris a financial tool that calculates a commercial tenant's share of the operating expenses for maintaining a building's common areas - lobbies, hallways, restrooms, parking lots, landscaping, elevators, and shared utilities. The CAM calculator computes your proportionate share (based on your leased square footage as a percentage of the total leasable area), your annual and monthly CAM charges, the impact of any CAM cap on expense increases, and a detailed breakdown of how your CAM payment is allocated across expense categories. Our calculator runs entirely in your browser with no data uploaded to any server.

1. Enter Your Lease Details:Input the building's total annual operating expenses (including utilities, cleaning, maintenance, insurance, property taxes, and management fees), the total leasable square footage of the building, and the square footage of the space you lease. The calculator automatically displays your proportionate share percentage as you type.
2. Set Your CAM Cap (Optional): Enter the annual CAM cap percentage typically specified in your lease (usually 3-10%). This caps how much your CAM charges can increase year over year. Leave at 0% if there is no cap. The calculator models both the capped and uncapped CAM amounts and shows the reconciliation difference.
3. Review the Complete Analysis: The calculator displays your proportionate share percentage, monthly CAM payment, annual CAM charges, the capped CAM amount (if applicable), and a detailed expense category breakdown with a color-coded visualization bar. Each expense category shows your share of utilities, cleaning, maintenance, insurance, property taxes, management fees, and other operating expenses.

• Proportionate Share:Your percentage of the building's total leasable area. This is calculated as your leased square footage divided by the total leasable square footage. A tenant leasing 5,000 sq ft in a 50,000 sq ft building has a 10% proportionate share. This percentage determines your portion of all CAM expenses.
• Monthly & Annual CAM Charges: Your total CAM payment broken down by month and year. Annual CAM is the total building operating expenses multiplied by your proportionate share. Monthly CAM is the annual amount divided by 12 - the amount you pay each month as part of your total lease payment.
• CAM Cap & Reconciliation: If your lease includes a CAM cap (e.g., 5%), the calculator shows both the uncapped CAM (actual expenses × your share) and the capped CAM (limited to the cap percentage increase). The reconciliation amount is the difference - positive means you may owe additional charges at year-end reconciliation.
• Expense Category Breakdown: A detailed breakdown of your CAM payment across seven expense categories: utilities, cleaning & janitorial, maintenance & repairs, insurance, property taxes, management & administration, and other operating expenses. Each category is shown with a dollar amount and a color-coded visual bar chart.

The CAM charges calculator is 100% free with no signup required. All calculations are performed locally in your browser - your lease details, expense amounts, and square footage data never leave your device. There are no usage limits or caps. The tool supports lease analysis for any commercial property type - office, retail, industrial, or mixed-use. Use it as many times as you need to analyze different properties, model CAM cap scenarios, or prepare for lease negotiations.