A 1-inch PVC Schedule 40 pipe holds about 0.045 gallons of water per foot.

Sources

• PVC Schedule 40 DWV and Pressure Pipe - Product Data Sheet (PDS-PVC-40-PE-PIPE-1019)primaryCharlotte Pipe and Foundry Company — Manufacturer spec sheet, ASTM D1785 / ASTM D1784. Fetched (downloaded PDF, read directly). Gives average OD and minimum wall thickness for Schedule 40 PVC, 1/2in-16in. Used to cross-check the OD/wall figures behind the PVC Sch 40 rows against Engineering Toolbox's OD/wall/ID table -- both matched exactly (e.g. 1/2in: .840 OD / .109 wall in both).
• Copper Pipe Dimensions (Type K, L, M, DWV) - SupplyHouse.com ResourcessecondarySupplyHouse.com — Fetched (downloaded PDF, read directly). Distributor-published dimension chart citing ASTM B88; gives explicit outside AND inside diameter columns for Type K, L, M, and DWV copper tube, nominal 1/4in-12in. Source of every copper-tube inside-diameter value used in this dataset.
• Streamline Copper Tube for Plumbing and Mechanical Applications - Submittal SheetprimaryMueller Streamline Co. (Mueller Industries) — Fetched (downloaded PDF, read directly). Manufacturer submittal sheet confirming Type K/L/M copper tube is manufactured to ASTM B88; gives weight-per-foot and pressure ratings but NOT a dimension table, so it corroborates material/standard only -- inside-diameter numbers came from the SupplyHouse chart instead.
• Standard Pipe Schedules and Pipe Sizes Chart Table Data (ANSI/ASME B36.10M, API 5L)secondaryEngineers Edge — Direct fetch returned HTTP 403; retrieved via the r.jina.ai reader proxy instead. Gives OD, wall thickness, and inside diameter for steel pipe Schedule 40 and Schedule 80, 1/8in-12in, per ASME B36.10. Used for the galvanized/black steel rows (galvanized steel shares black-steel schedule dimensions; the coating negligibly reduces bore and is not separately tabulated by any source we could find).
• PVC and CPVC Pipes - DimensionssecondaryEngineering Toolbox — Direct fetch returned HTTP 403; retrieved via the r.jina.ai reader proxy instead. Gives OD, wall thickness, and inside diameter for PVC (and, per the page's own text, CPVC) Schedule 40 and 80, matching ASTM D1785 dimensions. Cross-checked against the Charlotte Pipe PDS for Schedule 40 OD/wall (exact match). Source of ID for all PVC Sch40/Sch80 and CPVC Sch80 rows.
• FlowGuard Gold Pipe - CPVC Copper Tube Size (CTS) Pipe - Product Data Sheet (PDS-CTS-PIPE-124)primaryCharlotte Pipe and Foundry Company — Fetched (downloaded PDF, read directly). Manufacturer spec sheet, ASTM D2846, SDR11 CTS CPVC. Gives average OD and minimum wall thickness (1/2in-2in) but no inside-diameter column, and no other source we could reach (Engineering Toolbox's CTS-CPVC page, Spears' CTS PDF, Corzan's dimensions page) published one either -- so CTS CPVC is documented but excluded as a row (see gaps).
• PEX Pipe Sizes Chart (ASTM F876/F877, CTS/SDR9)secondaryPipeSizing.net — Fetched directly (200 OK). Self-consistent OD/wall/ID table (OD - 2 x wall = ID exactly, in every row) for CTS PEX per ASTM F876/F877, 3/8in-2in. Used in preference to an Engineering Toolbox ASTM-F876-PEX page whose AI-extracted ID values were internally inconsistent with its own OD/wall figures, so that page was dropped rather than used.
• HDPE Pipe Sizes Chart (ASTM D3035, IPS, SDR 11/17/21)secondaryPipeSizing.net — Fetched directly (200 OK). OD/wall/ID table for IPS-sized HDPE pipe, SDR11 and SDR17, 1/2in-6in, per ASTM D3035. We could not reach a second, independent HDPE dimension source to cross-check it: JM Eagle's PE Water & Sewer PDF and Charlotte Pipe's cast-iron manual both returned HTML/Incapsula bot-block pages instead of real PDFs when downloaded.
• CISPI 301-18: Standard Specification for Hubless Cast Iron Soil Pipe and FittingsprimaryCast Iron Soil Pipe Institute (CISPI) — Fetched (downloaded PDF, read directly). The industry standard itself (explicitly stated in the document to include the requirements of ASTM A888). Table 1, 'Dimensions and Tolerances of Spigots and Barrels for Hubless Pipe and Fittings,' gives the actual inside diameter of the pipe barrel for every size, 1-1/2in through 15in -- this is a directly measured/toleranced bore dimension, not a wall-thickness subtraction. Source of every cast-iron row.

Method

Volume = π × (ID ÷ 2)² × 12 in ÷ 231 in³/gal. Liters = gal × 3.785412. Weight = gal × 8.345 lb/gal (water near room temperature). Every inside diameter is a sourced figure from a manufacturer spec sheet or standards document — never back-computed from nominal size.

Gaps

CPVC Copper Tube Size (CTS) SDR11, the form most common in residential CPVC plumbing (ASTM D2846): Charlotte Pipe's own FlowGuard Gold CTS product data sheet gives average OD and minimum wall thickness but no inside-diameter column, and Engineering Toolbox's dedicated CTS-CPVC page also stops at wall thickness. Spears' CTS technical PDF was password-protected and Corzan's dimensions page 404'd. We couldn't find a published ID for this size series, so it is not in the table -- CPVC is represented only by Schedule 80 IPS (which shares PVC Schedule 80's dimensions). PEX and HDPE inside-diameter figures each rely on a single secondary aggregator (pipesizing.net); we tried but failed to reach a second, independent source (Uponor's PEX manual and JM Eagle's HDPE PDF were both unreadable/blocked), so those two material groups carry more single-source risk than the copper, PVC, steel, and cast-iron rows, which are each corroborated by 2 sources or a primary standard. Copper Type K/L/M sizes above 2in nominal (up to 12in, per the SupplyHouse chart) and cast-iron sizes above 8in (per CISPI 301 Table 1, up to 15in) exist in the sourced material but were left out of the table to keep it to common plumbing/DWV sizes.