Calculate the transition bend angle in degrees using the arctangent function of the vertical offset height divided by the horizontal footprint run. Ensure compliance with NEC, IEC, and NEMA bend-radius standards for safe cable routing. Calculate centerline arc lengths, structural setback bounds, linear chords, and offset tray travel. In this guide, you will learn the bend radius formula, how to calculate 90-degree bends, minimum bend radius requirements for different tray types, and practical examples. What Is Cable Tray Bending Radius? 1. Solid Bottom / Perforated Tray 3. Estimate safe cable tray inside and outside. This calculator keeps take-up, centerline radius, and bend crowding separate so you can see whether the tray corner is too tight, too crowded, or both.