My apps — simulator
Multi-variate yield simulator.
Deterministic scenario engine — rental-property economics
Every combination of occupancy and nightly rate, computed and visualized — so a property decision rests on the full landscape of outcomes, not a single spreadsheet guess.
01 — What it is
The whole outcome space.
The simulator evaluates the annual yield of a dual-unit rental property (a main room plus a lock-off unit) by sweeping four variables — main-room occupancy, lock-off occupancy, main-room nightly rate ($150–$500), and lock-off nightly rate ($100–$250) — through every step of their ranges. That produces 3,520 fully-computed scenarios, each carrying gross revenue, operating costs, net income, and yield on purchase price.
A note on the label: this is a multi-variate grid sweep, not a Monte Carlo simulation. Monte Carlo draws random samples from probability distributions; this engine exhaustively computes every scenario in the grid exactly once. The result is deterministic and reproducible — same inputs, same 3,520 answers, every time. For a bounded four-variable space, exhausting the grid is strictly more informative than sampling it.
02 — Try it
Live simulator.
Runs entirely in your browser — nothing is uploaded, no account needed.
03 — User guide
Four ways to read the landscape.
Swarm
An animated dot plot of all 3,520 scenarios, each positioned by its yield — see where outcomes cluster and where the tails live.
Distribution
A histogram of yield frequency — how likely each band of returns is across the whole scenario space.
Matrix
A heatmap of occupancy × nightly-rate combinations — spot the thresholds where the economics flip.
Interactive
Real-time sliders for all four variables — dial in any scenario and watch revenue, net income, and yield respond instantly.
- Pick one of the four view tabs across the top of the simulator.
- Start with Swarm or Distribution to understand the overall shape of possible outcomes.
- Move to Matrix to find which occupancy and rate combinations clear your target yield.
- Finish in Interactive — set the sliders to your expected scenario and read gross revenue, net income, annual yield, and where that outcome ranks as a percentile among all 3,520 scenarios.
04 — Under the hood
Model & assumptions.
Fixed parameters baked into the current model (editable in the source):
| Parameter | Value |
|---|---|
| Purchase price | $414,000 |
| Unit size | 85.84 sqm |
| Monthly HOA | $8.50 / sqm |
| Credit-card commission | 2.5% |
| OTA commission | 12% |
| Electricity | 4% of revenue |
| Insurance rate | 0.5% |
| Guest services | $11 / night |
| Maintenance reserve | 4% of revenue |
| Owner share | 80% of net revenue |