Calculate the full internal capacity of a straight circular pipe using its actual bore diameter and length.
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0.000001 – 1,000,000,000 mm
0 – 1,000,000,000 m
Internal pipe capacity
19.6350 L
A full straight circular bore of constant diameter. Use actual internal diameter rather than nominal pipe size or outside diameter. Fittings and partial filling are excluded.
Radius in meters = internal diameter in mm ÷ 2,000.
Capacity = πr² × length.
Volume = πr²L, with radius and length in meters. For diameter in mm, radius in meters is diameter/2,000.
A 50 mm internal diameter over 10 m holds approximately 19.635 L when full, or about 5.187 US gallons at 1 gal = 231 in³ = 3.785411784 L exactly (NIST Handbook 44, Appendix C).
Use the actual internal diameter. Nominal size and outside diameter are not the same as the water-carrying bore.
Last updated . Results are estimates for informational purposes only.