Net Effective Rent Calculator

Advertised rent rarely reflects what a lease actually costs once a landlord throws in free months or other sweeteners. Net effective rent strips away that noise and gives you a single number you can budget against and use to compare apartments fairly, since the unit with the lower sticker price can end up costing more if it comes with fewer concessions. The gap is far from trivial: in tight markets like New York City, landlords averaged 1.8 months free on new leases in early 2026, which reshaped what tenants really paid across the term.

To find it, take the full cost of the lease, monthly rent times the number of months, subtract the value of every concession the landlord offers, and divide what's left by the full length of the lease term. Concessions aren't limited to free rent; reduced security deposits and one-time cash incentives count too. Written out, the math is: Net Effective Rent = [(Monthly Rent * Lease Term in Months) - Total Value of Concessions] / Lease Term in Months.

The accuracy of the result depends on capturing every concession, not just the obvious free months. A trimmed security deposit or a move-in bonus belongs in your concession total as well. Where people go wrong is dividing the monthly rent by the months they actually pay, skipping the step of removing the free months from the lease's total cost first, which quietly overstates the true rate.