• Costco average net profit margin for 2023 was 2.6%, a 0.39% increase from 2022.
• Costco average net profit margin for 2022 was 2.59%, a 2.78% increase from 2021.
• Costco average net profit margin for 2021 was 2.52%, a 5% increase from 2020.

Net profit margin can be defined as net Income as a portion of total sales revenue.