Housing Affordability Index Calculator

Housing price-to-income ratio is the clearest affordability benchmark. Ratios under 3 are considered affordable; 3-4 moderately affordable; 4-5 unaffordable; over 5 severely unaffordable. typical is around 8; closer to 13. A 350,000 median price against a 50,000 median income = 7.0 ratio — well above affordable thresholds. Use this to compare cities, track affordability changes, or frame your own decision.

Run it with sensible defaults

Using median home price of 350,000, median household income of 50,000, the calculation works out to 7.00x. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Median Home Price and Median Household Income — do not pull with equal force. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.

How the math works

Standard housing-affordability ratio. Tracked by IMF, OECD, and housing agencies. Bands from Demographia affordability study.

Why this matters before you sign

A mortgage is usually the biggest single financial commitment a person makes. The difference between a well-chosen product and a hasty one can run into tens of thousands over the life of the loan. Running the numbers here before committing is the cheapest form of due diligence available.

What this doesn't capture

The figure excludes arrangement fees, valuation costs, legal fees, insurance, and any early-repayment charges — those can add several thousand to the headline cost. Rate changes at renewal for fixed-term deals will shift the picture further. Use this for the core interest/principal math and add the other costs on top.

Worked example

Two cities show how the ratio changes with local conditions:

• City A: Median home price 280,000; median household income 70,000. Ratio = 4.0x (moderately affordable)
• City B: Median home price 520,000; median household income 65,000. Ratio = 8.0x (severely unaffordable)

Both cities have similar incomes, but City B's housing market requires more than double the income multiple to reach the median price. The same household income stretches much further in City A.

When this metric is useful

The price-to-income ratio serves several descriptive purposes:

1. Comparing affordability between different cities or regions at a single point in time
2. Tracking how a single market's affordability has shifted over months or years
3. Understanding whether local income growth has kept pace with home price growth
4. Gauging the scale of the gap between what median earners can access and median market prices

What the result illustrates and what it does not

The price-to-income ratio illustrates the relationship between local earnings and home costs. It shows how many years of gross median household income would theoretically be required to purchase at the median price. It does not account for:

• Deposit requirements or down-payment conventions
• Borrowing capacity based on credit history or employment status
• Local interest rates or mortgage terms
• Variations in income distribution (some households earn far more or less than the median)
• Cost of living beyond housing
• Regional differences in property taxes, maintenance costs, or insurance

The ratio is a structural snapshot, not a personal affordability assessment.

Educational use

This calculator is for educational illustration of how the price-to-income metric operates. Results are models based on the inputs you provide and standard affordability bands. They do not reflect individual circumstances, local lending criteria, or future market conditions.