<p>Live load distribution factor (LLDF) equations play a crucial role in bridge design because they determine the distribution of moments and shears, which are essential for designing new bridges or evaluating existing ones. The AASHTO Load and Resistance Factor Design (LRFD) specification, which is the current standard for bridge design, employs power equations to represent bridge behavior. However, these equations often rely on unknown parameters during the early stages of bridge design, making an iterative process necessary to calculate the LLDF accurately. Additionally, these equations do not account for critical factors such as bridge span, the number of girders, girder spacing, and the number of lanes. Many researchers have also questioned the accuracy of the AASHTO-LRFD equations, suggesting that they tend to overestimate the LLDF when compared to results from finite element analysis (FEA). Consequently, the main goals of this research are to develop a more accurate and simpler equation for calculating live load distribution factors for precast concrete U-girder bridges and to compare its accuracy with finite element analysis results. The proposed equation considers multiple parameters, including bridge span, girder spacing, the number of girders, and the number of lanes, to provide a more precise calculation. It yields more accurate results than the AASHTO-LRFD equations and aligns more closely with finite element analysis results.</p>