Full Definition
Effective rent is the true average monthly cost of an apartment over the entire lease term, calculated by subtracting the value of all concessions from the total annual rent, then dividing by the lease length in months.
Formula: Effective Rent = (Listed Monthly Rent × Lease Months − Total Concession Value) ÷ Lease Months
Example: A unit listed at $1,650/month with 8 weeks free on a 12-month lease.
Total annual rent if paid in full: $1,650 × 12 = $19,800. Concession value: $1,650/4 × 8 = $3,300. Net rent: $19,800 − $3,300 = $16,500. Effective monthly rent: $16,500 ÷ 12 = $1,375.
That $1,650 listed unit actually costs $1,375/month effective. A nearby unit listed at $1,500 with no concession is the more expensive option.