Plumbing
Calculators.
Free precision tools — no signup.
12 Tools
Water Heater Size Calculator
Size your water heater by household demand
Pipe Size Calculator
Calculate pipe diameter for water supply or drainage
Water Pressure Calculator
Diagnose water pressure and calculate friction losses
Septic Tank Size Calculator
Size your septic tank and drain field by bedrooms
French Drain Calculator
Calculate french drain materials and pipe sizing
Fixture Unit Calculator
Calculate total drainage fixture units (DFU) and water supply fixture units (WSFU) to size drain stacks and supply pipes per IPC/UPC code
Drain Slope Calculator
Calculate drain pipe slope in inches per foot, check IPC/UPC code compliance, and compare flow velocity for 2–6 inch pipes