PoiseuilleEquationTools is a lightweight app designed to help students, researchers, and engineers quickly apply the Poiseuille equation to laminar flow in cylindrical tubes. It provides focused calculators to determine pressure difference, tube length, or dynamic viscosity based on common inputs like flow rate, radius, and fluid properties. The interface is straightforward, with clear input fields, immediate results, and helpful hints to reduce mistakes. Ideal for classroom work, lab prep, or quick design checks, the app streamlines repetitive calculations and promotes intuition around how geometry and viscosity influence flow. It’s a practical companion for fluid mechanics coursework and day‑to‑day technical tasks.