Cost pool
Which expenses belong in CAM under your lease, and are any separately billed or excluded?
Lease definitions · category ledger · invoices
CAM fee calculator
See the CAM math. Know what to verify.
Explore how an expense pool, tenant share, and estimated payments can produce a monthly CAM amount and an annual true-up. Then check the lease and records behind each number.
The calculation at a glance
01
Defined CAM expenses
Start with the cost pool that applies.
02
Your allocated share
Apply the lease-defined method.
03
Estimated payments
Credit what you already paid.
A calculated balance is a question to check, not proof of an overcharge.
Try the numbers
From annual costs to your monthly estimate.
Enter an annual CAM pool, your share, and what you paid in monthly estimates. The calculator shows the simple arithmetic for a monthly charge and a year-end balance.
Use lease and statement figures when you have them. This illustration does not account for every cap, exclusion, separate pool, fee, or credit.
Illustrative CAM fee calculator
Your annual share
$12,000.00
Monthly equivalent
$1,000.00
Illustrative annual true-up
$2,400.00 balance
$12,000.00 annual share − $9,600.00 in entered payments
Illustrative arithmetic only. The result does not verify the expense pool, lease-defined share, caps, exclusions, fees, credits, or payment history. It is not a bill or an overcharge estimate.
Make each input traceable
Four checks before trusting the total.
The arithmetic is easy to repeat. The useful work is finding the document that supports each input.
Tenant share
Which area and allocation method apply to this particular expense pool?
Lease allocation clause · area schedule
Limits and fees
Do caps, base-year terms, administration fees, or amortization rules change the calculation?
Cap worksheet · fee calculation · project records
Payments and credits
Were all estimated payments and other credits applied to the annual statement?
Payment ledger · annual reconciliation
Read the result correctly
A true-up is not an overcharge finding.
A positive balance means the annual share entered is higher than the estimates entered. A credit means the reverse. Neither result tells you whether the charge is permitted or whether all payments were counted.
See how annual reconciliation works ↗A useful review sequence
1
Match the lease
Find the cost definitions, share clause, limits, and notice process.
2
Match the statement
Locate the billed categories, allocated percentage, and estimate credits.
3
Ask for the records
Use the lease's records procedure to request missing support in time.
Go deeper
Explore the terms behind the formula.
Common questions
What the estimate can and cannot say.
Is this calculator my actual CAM bill?
No. It shows arithmetic using the numbers you enter. The signed lease and supporting records determine the permitted cost pool, allocation, limits, and credits.
Does a positive true-up mean I was overcharged?
No. It means the entered annual share is greater than the entered estimated payments. You still need to verify the underlying costs and lease terms.
Can my share differ between CAM, taxes, and insurance?
Yes. A lease may define separate cost pools or allocation methods. Use the figures that apply to the charge you are examining.
What should I do if the statement lacks detail?
Check your lease's notice and records-access procedure, including any deadline, then request the relevant ledger, invoices, area schedule, and payment history.
Your next step
Bring the lease into the calculation.
A free lease preview can surface CAM allocation terms and initial questions. Add an annual statement and supporting PDFs if you have them to compare the billed details before deciding whether a full report is useful.