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Pipe volume calculator

17.43 gal of water65.99 L · weighs 145.3 lb
2" Sch 40 PVC/steel · 100' 0"
17.43 gal
Water weight
145.3 lb

These sketches are here to help you order material and price the work quickly. They are not engineered or shop drawings — always build from your approved project drawings.

Run 1
Pipe
Nominal size

ID 2.067"

Inside diameter = outside diameter − 2 × wall from each pipe standard. Water only — fittings, tanks and the pipe itself are not included.

Show the math▾
  1. 2" Sch 40: inside diameter
    OD − 2 × wall
    2.375 − 2 × 0.154 (in) = 2.067
  2. 2" Sch 40: gallons
    π ÷ 4 × ID² × 12 ÷ 231 × feet
    π ÷ 4 × 2.067² × 12 ÷ 231 × 100 = 17.43
  3. Liters
    gallons × 3.785411784
    17.43 × 3.785411784 = 65.99
  4. Weight of the water
    liters × 0.999 kg ÷ 0.45359237 (8.34 lb per gallon)
    65.99 × 0.999 ÷ 0.45359237 = 145.3 lb

Where the numbers come from

  • Schedule 40 PVC / steel: OD and wall: ½" 0.840/0.109 · ¾" 1.050/0.113 · 1" 1.315/0.133 · 1¼" 1.660/0.140 · 1½" 1.900/0.145 · 2" 2.375/0.154 · 3" 3.500/0.216 · 4" 4.500/0.237 · 6" 6.625/0.280ASTM D1785 (PVC) uses the same OD and wall as ASME B36.10 Schedule 40 steel. IDs land on the table's 0.622, 0.824, 1.049 … 6.065".Source
  • Copper tube K, L, M: OD = nominal + ⅛"; walls (½" to 4"): K 0.049–0.134, L 0.040–0.110, M 0.028–0.095ASTM B88 nominal walls. K and L also checked against the ASTM B819 table (same tube sizes, https://www.engineeringtoolbox.com/medical-gas-pipes-dimensions-d_1240.html): 4" L = 0.110" wall, 3.905" ID, as Mueller Streamline lists it. Real tube varies slightly within the standard's tolerance.Source
  • PEX (SDR 9): Copper tube size OD; wall = OD ÷ 9, at least 0.070"ASTM F876. ½" PEX: 0.625 − 2 × 0.070 = 0.485" ID. Some charts print slightly smaller gallons (e.g. 0.92 per 100' for ½") — they use a different ID; this page uses the minimum wall.Source
  • US gallon: 231 in³ exactly; 3.785411784 LSource
  • Water weight: 0.999 kg per liter at about 60 °F = 8.34 lb per gallonWater is slightly lighter when hot (about 8.2 lb/gal at 180 °F). This is the water only — add the pipe's own weight for hanger loads.Source

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How much water a run of pipe holds — for filling or draining a system, sizing glycol or a flush, or checking hanger loads.