What does this calculator do?
A free month reduces the cost over a lease without necessarily reducing the invoice in ordinary paid months. This tool separates the net-effective base-rent average from gross monthly rent, then adds the recurring fees, utilities, and nonrefundable upfront charges you enter. Comparing both views prevents an attractive average from disguising the cash needed in a typical month.
How to use it
- Copy the gross rent, term, and exact concession from the written offer.
- Enter additional credits only if they are separate from the free months. Keep refundable deposits outside this cost calculation.
- Compare net-effective base rent, the all-in average, and the paid-month housing bill. Ask when each credit actually appears.
The math, made clear
Net-effective base rent = (gross monthly rent × lease months − free-month rent − additional rent credit) ÷ lease monthsA worked example
At $2,200 gross rent on a 12-month lease with one free month, total base rent is $24,200 and the net-effective base average is $2,016.67. Adding $75 monthly fees, $150 utilities, and $300 nonrefundable upfront charges gives a $2,266.67 all-in average. A normal paid-month bill before credits is still $2,425.
What to keep in mind
Assumes constant gross rent and entered costs for the whole lease. It does not decide concession eligibility, repayment/clawback terms, renewal rent, local fee legality, credit timing, or the cash deposit required. Utilities are your estimates. The all-in average includes only the categories you supplied.
All default values are illustrative. Results are rounded for display; calculations use full precision except where a split must allocate exact cents. Read our methodology for shared definitions and report a calculation issue if a result looks wrong.