• McKesson average gross margin for 2023 was 4.29%, a 10.63% decline from 2022.
• McKesson average gross margin for 2022 was 4.8%, a 5.88% decline from 2021.
• McKesson average gross margin for 2021 was 5.1%, a 1.16% decline from 2020.

Gross margin can be defined as a company's total sales revenue minus its cost of goods sold, divided by the total sales revenue, expressed as a percentage.