Drain pipe slope calculator
Total fall to the nearest 1/16" for any run, pass/fail against IPC minimums, and fall marks every 5 feet for your string line.
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Trades tools
Quick, accurate calculators for plumbing and construction — big buttons, no sign-up, and the code reference right on the page. Built for a phone in a dusty hand.
Fixture unit (DFU) sizing
Add up fixtures and get the drain size they need.
Water heater sizing
First-hour rating for tank heaters and GPM for tankless, from the household's peak use.
Job pricing & markup
Markup vs margin, labor burden and the real hourly rate behind a bid.