About the Absorption Rate Calculator
The absorption rate measures how quickly homes are selling in a market: the share of the current inventory that sells in a typical month. Its mirror image, months of inventory (or months’ supply), tells you how long it would take to sell every active listing at the current pace if no new homes came on the market. Agents, appraisers, builders and investors use both to judge whether prices are likely to rise, hold or soften.
Enter the number of active listings and the number of homes sold over a recent period — for example the last 6 or 12 months from your local MLS or market report. The calculator returns the absorption rate, months of inventory, average sales per month, an indication of market type, and how many days it would take to sell the whole current inventory at that pace. Add the number of new listings coming on each month to see whether inventory is actually shrinking and when it would clear.
As a common rule of thumb, under about 4 months of inventory is a seller’s market, about 4–6 months is balanced and more than 6 months is a buyer’s market. Thresholds vary by price range and region, and luxury segments often carry more inventory, so compare against your area’s own history and calculate separate figures for each price band or neighborhood.
With the default inputs, the monthly absorption rate is 20.8%. Change any value above to recalculate instantly.
How to use the absorption rate calculator
- 1Look up active listings in your area or price range from the MLS or a market report.
- 2Enter the number of homes sold over a recent period and the period length in months.
- 3Optionally add the number of new listings coming on each month.
- 4Read the absorption rate, months of inventory and market type.
- 5Repeat for each price band or neighborhood to compare segments.
Formula and method
First divide the number of homes sold by the length of the period to get average sales per month. The absorption rate is that monthly figure as a percentage of current active listings. Months of inventory is the reciprocal: active listings divided by monthly sales, i.e. how long the current supply would last at the current sales pace.
Days to sell multiplies months of inventory by the average month length (365.25 ÷ 12 days). If you enter new listings per month, the net monthly reduction in inventory is sales minus new listings, and months to clear is active listings divided by that net figure. Market type uses the common rule of thumb of under 4 months (seller’s), 4–6 months (balanced) and over 6 months (buyer’s).
- S
- Homes sold during the period
- M
- Length of the period in months
- A
- Current active listings
- MOI
- Months of inventory = A ÷ (S ÷ M)
Worked examples
240 active listings, 300 sales in 6 months
Three hundred sales over six months is 50 a month. Fifty is 20.8% of the 240 active listings, so it would take 240 ÷ 50 = 4.8 months to sell everything — a balanced market under the 4–6 month rule of thumb.
Slow market with new listings still arriving
Ten sales a month against 90 listings is an 11.1% absorption rate and 9 months of inventory, a buyer’s market. Because 6 new listings arrive each month, inventory only falls by 4 a month and would take 22.5 months to clear.
Hot market where new supply outpaces sales
Thirty sales a month against just 45 listings means two-thirds of inventory sells every month and only 1.5 months of supply — a strong seller’s market. But 35 new listings a month exceed sales, so inventory is starting to build, an early sign of cooling.
Frequently asked questions
What is the absorption rate in real estate?+
The absorption rate is the percentage of available homes that sell in a given month. If 50 homes sell per month and 240 are listed, the absorption rate is about 20.8%. Higher rates mean homes are selling quickly and the market favors sellers.
How do you calculate months of inventory?+
Divide current active listings by the average number of homes sold per month. For example, 240 listings ÷ 50 sales per month = 4.8 months of inventory. It is the inverse of the monthly absorption rate.
How many months of inventory is a balanced market?+
A common rule of thumb is about 4 to 6 months of supply. Fewer than about 4 months usually points to a seller’s market with rising prices and multiple offers, while more than 6 months points to a buyer’s market with more negotiating room.
Where do I find the data for an absorption rate?+
Local MLS systems, real estate agents and regional REALTOR associations publish active listing counts and closed sales by month. National reports also publish months’ supply, but local and price-band figures are far more useful for a specific property.
Why does absorption rate matter for sellers and investors?+
It signals pricing power. In a fast-absorbing market sellers can price firmly and expect quick sales; in a slow one they should expect longer days on market and price reductions. Investors and builders use it to time purchases and estimate how long new units will take to sell or lease.