Drain Slope CalculatorCalculate the total vertical drop and grade for a gravity drain line.Expansion Tank CalculatorSize a thermal expansion tank for a closed plumbing or hydronic system.Faucet Flow Savings CalculatorSee how much water and money a low-flow faucet saves over a year.PEX Length CalculatorCalculate the total PEX tubing to buy for a set of supply runs, including a waste allowance.Pipe Sizing CalculatorRecommend a pipe diameter for a given flow rate, keeping velocity within safe limits.Pipe Volume CalculatorCalculate the volume of water held inside a pipe from its inside diameter and length.Septic Tank Size CalculatorFind the minimum septic tank size for your home by bedroom count and occupancy.Sump Pump Size CalculatorEstimate the pump capacity and horsepower needed to keep up with water inflow.Water Flow Rate CalculatorEstimate the water flow rate through a pipe from its inside diameter, supply pressure, and run length.Water Heater Size CalculatorEstimate the water heater tank size and first-hour rating for your household.