DealerVLO
Sign inStart free trial
Free · No signup · Shareable URL

Inventory Turn Rate Calculator

Turn is the number that quietly runs your lot. Enter your average stock and how many you sell a month to get your annual turn rate, your days' supply, and what the same inventory dollars could make at a faster turn.

Why turn is the highest-leverage number on a small lot

Your annual gross is just units sold × gross per unit — and at a fixed lot size, units sold is turn rate × stock. So on the same lot, with the same capital, doubling your turn roughly doubles your gross. That's the whole game on an independent lot: you rarely win by buying more inventory, you win by turning the inventory you have faster.

The levers are upstream of this calculator: buy cars that sell fast, get them front-line-ready in days not weeks, and price to the market instead of to your cost.

Know your turn without the spreadsheet

DealerVLO tracks days-on-lot on every unit automatically and flags aging inventory before it becomes a wholesale loss — so your turn rate is a number on your dashboard, not a calculation you do once a quarter and forget.

  • Days-on-lot counted automatically on every vehicle
  • Aging report flags units past your threshold for repricing
  • Per-vehicle cost + gross tracked from acquisition to sold
  • Public dealer website + feeds to move metal faster
Start your 14-day free trial The turn-rate benchmark guide

$29/month · 14-day free trial · Cancel any time

Common questions

How do you calculate inventory turn rate for a car dealership?▾
Annual turn rate is vehicles sold in a year ÷ average vehicles in stock. Keep ~30 cars and sell 20 a month? That's 240/yr ÷ 30 = 8 turns. Days' supply is 365 ÷ turn — so 8 turns is about a 46-day supply.
What is a good inventory turn rate for a used car lot?▾
A common target for independents is roughly 8–12 turns a year (30–45 days' supply). Under about 6 turns (60+ days) usually means capital is sitting too long. It varies by segment — economy cars turn faster than specialty units — so treat these as a reference, not a rule.
What is days' supply of inventory?▾
The average number of days a vehicle sits before it sells at your current pace — 365 ÷ your annual turn rate. Lower is better: every extra day is more holding cost and more depreciation risk. Put a number on that with the holding cost calculator.
Why does turning faster make more money on the same capital?▾
Gross = units sold × gross per unit, and units sold = turn × stock. So doubling turn on the same lot roughly doubles annual gross without adding a dollar of inventory. That's why turn is the highest-leverage number on a small lot — it multiplies the return on capital you already have.