The direct answer
Seasonal STR underwriting should model revenue by month or season instead of multiplying one annual ADR by one annual occupancy assumption when demand varies materially. Booked nights, available nights and achievable rates can move independently across high, shoulder and low seasons.
Build revenue from monthly drivers
For each month, estimate bookable nights, occupancy and ADR using comparable evidence appropriate to that period. Monthly room revenue can then be modeled as bookable nights × occupancy × ADR, with other guest charges handled consistently.
To apply the approach to an editable scenario, use the Airbnb / Short-Term Rental Calculator. For the neighboring question, explore Vacation Rental ROI Calculator.
Do not average away peak dependence
Two properties can have the same annual occupancy but different cash-flow risk if one earns most revenue in a short peak season. Track the share of annual revenue generated in peak months and test weather, event or demand disruption where relevant.
Match expenses to seasonality too
Some costs are fixed throughout the year while cleaning, supplies, platform charges and management may vary with bookings or revenue. A monthly model helps avoid pairing seasonal revenue with unrealistically flat variable costs.
Worked example
A three-month peak period with 90 bookable nights at 80% occupancy and $300 ADR produces $21,600 of modeled room revenue. A 90-night low period at 35% occupancy and $160 ADR produces $5,040. Averaging both periods too early can hide the property’s dependence on peak demand.
Open Airbnb / Short-Term Rental Calculator and test your assumptions →
Common mistakes and limitations
Do not apply a peak-season ADR and occupancy to all 365 days. Also distinguish blocked owner-use nights from nights genuinely available for booking.
Uses user-entered assumptions and does not access Airbnb/AirDNA or guarantee local STR legality, demand or pricing.
Frequently asked questions
Should I use one annual ADR?
It can be a summary metric, but a seasonal property is usually better underwritten with monthly or seasonal assumptions.
What is the basic occupancy denominator?
Define it explicitly. For underwriting, booked nights divided by bookable nights is often more informative than dividing by every calendar night when some nights are intentionally unavailable.
Sources and further reading
The article’s examples are illustrative arithmetic. The references below provide context for operating, valuation or transaction concepts; they do not endorse the assumptions or the calculator.
- Fannie Mae — Selling Guide B3-3.8-03, Short-Term Rental (09/02/2026)Current short-term-rental income context and vacancy/maintenance treatment.
Read our editorial policy for the scope of these educational methods.