Housing inventory can shape home prices. Here’s how it's measured.

June 6, 2026 - 10:24

The number of homes sitting on the market is a key factor in determining whether home prices rise, fall, or stay flat. But real estate experts do not just count the total listings. They also measure how fast those homes are selling. This dual approach gives a clearer picture of supply and demand.

The most common measurement is "months of supply." This figure is calculated by taking the total number of active listings and dividing it by the number of homes sold in the past month. For example, if there are 10,000 homes for sale and 2,500 sell in a month, the market has four months of inventory.

A market with less than five months of supply is generally considered a seller's market. Prices tend to rise because there are more buyers than available homes. A supply between five and seven months is considered balanced, with prices moving at a normal pace. Anything above seven months points to a buyer's market, where homes sit longer and sellers often have to lower their prices to attract offers.

Another metric is "days on market," which tracks how long a typical listing stays active before going under contract. A low number, like 30 days or less, signals strong demand. A high number, like 90 days or more, suggests a glut of inventory or overpriced listings.

These numbers shift with the seasons. Spring usually brings more listings and more buyers, while winter tends to slow activity. Watching both the months of supply and the days on market together gives a more accurate read than looking at the raw count of homes for sale alone. For anyone buying or selling a home, understanding these measurements is a practical way to gauge the current market temperature.