Property development

Lease-up and Absorption Calculator

Estimate stabilization time, concessions and lost rent during lease-up. Enter your own assumptions and local rates.

What this calculator estimates

Estimate stabilization time, concessions and lost rent during lease-up. It combines the inputs below to produce Estimated months to stabilization. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces 11 months. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Total units or spaces — sample input: 100 units
• Units already leased — sample input: 15 units
• Net new leases per month — sample input: 8 units
• Average monthly rent per unit — sample input: 2200 currency units
• Average concession per new lease — sample input: 1000 currency units

How to interpret the result

Stress-test cost, timing, financing and stabilization assumptions. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not treat a preliminary budget as a guaranteed project cost. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.