• Tetra Tech average gross margin for 2023 was 16.01%, a 1.78% increase from 2022.
• Tetra Tech average gross margin for 2022 was 16.3%, a 4.29% decline from 2021.
• Tetra Tech average gross margin for 2021 was 15.63%, a 10.15% increase 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.