賃貸物件収益計算ツール
The detailed guide below is currently available in English.
Reading the numbers like an investor
Net operating income is collected rent minus operating costs, before the mortgage. Dividing it by price gives the cap rate — the property's unlevered yield. Subtracting the loan payment shows cash flow, and dividing annual cash flow by the cash you invested gives the cash-on-cash return. A property can have a decent cap rate but negative cash flow when financing is expensive, which is why both views matter.
よくある質問
What is the one percent rule?
A quick screen suggesting monthly rent should be about 1% of the purchase price. It is rare in expensive markets, and it ignores expenses and rates — use it only as a first filter, then run the full numbers here.
How much vacancy should I assume?
A common starting point is 5–8% (roughly one vacant month every one to two years), adjusted for local demand and how quickly units re-lease in your area.