How to Calculate the Fall of a Drain: A Plumber’s Guide to Slope, Speed, and Success

Knowing how to calculate the fall of a drain is a game-changer for plumbers and DIY enthusiasts. It's not just about getting water from point A to point B—get the slope wrong, and you risk clogs, slow drains, and even pipe damage. This guide breaks down the numbers, the logic, and the real-world tips that make drain slope calculation simple. Learn why the right angle matters more than you think and how a minor miscalculation can mess up a whole plumbing project. Perfect for anyone starting out or brushing up their skills.