Why is Cost of Goods Sold taken as numerator instead of revenue while calculating the Inventory Turnover Ratio?

Inventory Turnover Ratio is the financial ratio that shows how efficiently a business sells and replenishes its inventory. It shows how well a business manages its inventory.

Inventory Turnover ratio is calculated as follows:

Inventory Turnover Ratio = Cost of goods sold / Average Inventory 

But why is the Cost of Goods Sold taken as a numerator instead of revenue while calculating the Inventory Turnover Ratio?

Inventory