We calculate cable tray weight using the formula: Volume × Material Density. The calculation accounts for side rails, rungs, and cross-bars. In this guide, we'll walk you through the step-by-step process for calculating cable tray weight, while providing examples for both channel trays and ladder trays. This will help you make informed decisions for your projects. Export results instantly for schedules, submittals, and field checks. Density values are typical engineering references. IEC 61537 covers cable tray and cable ladder systems for the support and accommodation of cables, while NEC Article 392 governs cable. Calculating the weight of a cable tray is not always easy, but by following some simple steps, it can be done accurately. Knowing the correct weight.