Plumber
Drain fall, pipe weight and bedding for the trench. 5 tools: 3 are free, the rest are premium.
Free for plumber
Pipe slope and drain fall
Total fall, end elevation and percent grade for a drain line, checked against the plumbing code minimum. No account needed.
Also free
Free picks from other roles that are useful for the plumber role too.
Metal pipe weight calculator
Weight per length and total weight of round pipe or tube from its size, wall and material.
Manufacturing · ConstructionTrench volume and protection check
Excavation volume for a shored or sloped trench and the OSHA protective-system triggers.
Construction · EarthworksPremium tools
All of them come with the plumber plan.
Pipe bedding and backfill volume
Bedding and pipe-zone stone, final backfill and spoil for a pipe trench.
Construction · UtilitiesGravity pipe flow capacity (Manning)
Full-pipe flow and velocity for a gravity storm or sewer pipe, and how full your design flow runs it.
Construction · UtilitiesThe plumber plan
All 5 plumber tools, one plan
$10.20 a month at the launch price (list $12). Save more paying by the quarter or year; add another role for less. One of them is still waiting on a trade expert's check; its card says so.