Verify a drain pipe's slope against the required fall.
Slope is the total fall divided by the pipe length, giving inches of drop per foot. Comparing it to the required slope confirms the drain will flow. Gravity drains need a minimum slope to keep waste moving, and too little fall causes clogs and standing water.
Drain Slope
Slope = total drop / pipe length
Slope = total drop / pipe length Slope is the total fall divided by the pipe length, giving inches of drop per foot. Comparing it to the required slope confirms the drain will flow.
Gravity drains need a minimum slope to keep waste moving, and too little fall causes clogs and standing water.
This calculator takes 3 inputs: Pipe length, Total drop, Required slope. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.