Market Days Supply Calculator

Estimated market days supply

At the recent sales pace, the current listings represent about 45 days of inventory.

How to use this calculator

1. Choose comparable vehicles. For example, 2022–2024 Ram 1500 Big Horn 4x4 crew cabs with similar mileage and equipment in the same market area. Avoid mixing in unrelated trims, years or configurations.
2. Count active listings. Find how many matching vehicles are currently advertised in that area. Enter this under “Comparable vehicles for sale.”
3. Count completed sales. Find how many matching vehicles actually sold in that same market during the last 30, 60 or 90 days. Enter the sold count and select the matching period.
4. Read the result. A lower number suggests tighter supply relative to sales; a higher number suggests more inventory relative to demand.

Ram 1500 example

Suppose there are 42 comparable Ram 1500s for sale and 28 sold in the last 30 days. That is 28 ÷ 30 = 0.93 sales per day, and 42 ÷ 0.93 = 45 days of supply. These are sample numbers, not live Ram market data.

Where to find the numbers

• Inventory management tools (such as vAuto or another market analytics platform): often the best source for market-wide active comparable listings and estimated recent retail sales. Check how the provider defines its market radius and sold data.
• DMS (Dealer Management System): run a retail sales report filtered by model, model year and date to see what your dealership actually sold. Pair it with a matching snapshot of your store's inventory if measuring your own store.
• CRM: check delivered/sold deal reports and vehicle details as a secondary source. Verify against the DMS, because CRM stages and deal counts may not equal finalized retail sales.

Important: Don't divide market-wide listings by your dealership's sales. Both numbers must describe the same geographic area, comparable vehicles and time basis. A DMS or CRM alone generally cannot tell you how many competing dealers' vehicles sold.

Tip: If you only have your own store's data, label the result dealership days supply, not market days supply. The calculation is the same, but the scope is different.