Researchers have developed SesQ, a surface electrostatic simulator designed to accurately calculate the energy participation ratio (EPR) in superconducting qubits. This metric is crucial for evaluating design-dependent dielectric losses, which can significantly impact qubit performance. The conventional finite element method (FEM) requires 3D volume discretization, posing a severe multiscale computational challenge1. SesQ addresses this issue by providing a more efficient and precise numerical electromagnetic model. By simulating surface electrostatics, SesQ enables the calculation of EPR with improved accuracy, allowing for better characterization and minimization of dielectric losses in superconducting qubits. This advancement is significant for the development of reliable and efficient quantum computing systems. The ability to accurately simulate EPR using SesQ can help practitioners optimize qubit design, reducing losses and improving overall system performance, which matters because it can lead to more stable and efficient quantum computing operations.