Observed arrival · 2026-10-11
PlumbMath: plumbing calculators with their work shown
A set of browser-based calculation aids for working plumbers, covering pipe sizing, offsets, water volume, tankless heaters, and state code references.
- For
- Working plumbers checking calculations or code references
- Worth noticing
- The state-code table includes edition, effective date, amendments, and scope; filled rows are described as checked against official sources.
Field notes
The gas-sizing calculator covers low-pressure natural gas in Schedule 40 steel or copper tubing and offers longest-length and branch-length methods. The drain calculator references either the 2024 IPC or 2024 UPC, while the rolling-offset tool includes catalog take-outs for copper and PVC elbows. A separate table covers adopted plumbing and fuel-gas codes in each state and the District of Columbia, with edition, effective date, amendments, and scope.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue