Quick calculators and advanced simulators for real estate to make data-driven business decisions.
Sector context
SMB real-estate investors and developers operate on two unsynchronized clocks: the bank's, which collects interest every month, and the market's, which pays rent or sale proceeds on an unpredictable lag. Three months of vacancy turn an attractive cap rate into negative cash-on-cash. An optimistic sales projection for a five-building development can hold on paper but break at the first delay in pre-sales. The real-estate simulators model that gap: realistic occupancy, NOI, office vacancy, and the full cashflow cycle of a development from land to delivery.
Key metrics
Indicators an SMB operator in the sector should know before modeling decisions.
Cap rate
Annual NOI / asset value. 7–9% is healthy in stable urban areas; below 5% suggests appreciation speculation, not operating profitability.
Occupancy rate
For traditional rent, 90%+ sustained is the bar. For Airbnb, measure booked nights / available nights and factor in clear seasonality.
NOI (Net Operating Income)
Rental income minus operating expenses (property tax, insurance, management, maintenance, expected vacancy). Does NOT include debt service.
Cash-on-cash return
Annual cashflow / initial equity invested. For a leveraged investor this is the real indicator, not the cap rate.
ADR and RevPAR (Airbnb / short stays)
Average daily rate and revenue per available night. RevPAR = ADR × occupancy, capturing price-and-demand jointly.
How to pick the right simulator
If you rent residential or run Airbnb, the Airbnb occupancy simulator models RevPAR, seasonality, and variable costs per stay. If you buy-and-hold for traditional rent, the building vacancy simulator captures the office and retail reality. To compare hold-vs-sell horizons, use the real-estate sales simulator. And if you're developing a project from land to delivery, the real-estate development cashflow simulator covers the full cycle: equity contributions, pre-sales, financing cost, and milestone disbursements.
Practical example
Hypothetical case in US dollars. Plug your real numbers into the simulator to validate your own scenario.
An investor buys an office building for $850,000 USD with $250,000 USD equity and $600,000 USD financing at 6.5% annual. Expected rent $7,500 USD/month with 7% vacancy and $1,800 USD/month operating expenses. The simulator calculates an annual NOI of $66,420 USD and a cap rate of 7.8%. Annual debt service: $46,800 USD. Net annual cashflow $19,620 USD on $250,000 USD equity = 7.8% cash-on-cash return. The simulator also flags that a vacancy bump to 12% would drop cash-on-cash to 5.1%, below the return of a comparable fixed-income instrument.
Common modeling mistakes
Traps we see when reviewing sector planning. Avoid them before closing your own model.
Assuming market-average occupancy
The average includes premium, recently built buildings. A class B building in a transitional area must be modeled with its segment's vacancy, not the overall market's.
Forgetting maintenance capex
Roofs, façades, elevators, and systems get replaced every 8–15 years. Without a capex reserve, the stated NOI is fictional on a long horizon.
Confusing cap rate with investor return
Cap rate ignores leverage. For an investor who put 30% equity, the real indicator is cash-on-cash, not cap rate.
Poorly modeled Airbnb dynamic pricing
Lifting rates 15% doesn't preserve 80% occupancy; it usually drops 8–12 points. The simulator must read the estimated elasticity, not assume inelastic demand.
Scope and limitations
Real-estate simulators project under stable conditions and don't anticipate regulatory shocks (rent control, zoning changes, wealth taxes) or macro events (interest-rate crises, sharp FX moves). For material investment decisions, consult an accountant and a real-estate attorney in your jurisdiction.
Start here
The simulators with the most adoption in the sector. Each tackles a different business question.
Airbnb occupancy
RevPAR, seasonality, and variable per-night costs for hosts.
Building vacancy
Models office and retail vacancy by segment and area.
Development cashflow
Equity contributions, pre-sales, and milestone disbursements for ground-up projects.
Sales projection
Compares hold-vs-sell horizons with NOI and expected appreciation.