Online Pipe Formula Calculator
outside diameter (in)
inside diameter (in) - (default values: STD 4 inches - Carbon, Alloy and Stainless Steel Pipes - ASME/ANSI B36.10/19
The calculator is based on the piping formulas and equations below.
Moment of Inertia
Moment of inertia can be expressed as
I = π (do4 - di4) / 64
≈ 0.0491 (do4 - di4) (1)
I = moment of inertia (in4)
do = outside diameter (in)
di = inside diameter (in)
Section modulus can be expressed as
S = 0.0982 (do4 - di4) / do (2)
S = section modulus (in3)
Section modulus is a geometric property for a given cross-section used in the design of beams or flexural members.
Transverse Metal Area
Transverse metal area can be expressed as
Am = π (do2 - di2) / 4 (3)
Am = transverse metal area (in2)
External Pipe Surface
External pipe or tube surface per ft of length can be expressed as
Ao = π do / 12 (4)
Ao = external pipe surface area (ft2 per ft pipe)
Internal Pipe Surface
Internal pipe or tube surface per ft of length can be expressed as
Ai = π di / 12 (5)
Ai = internal pipe surface area (ft2 per ft pipe)
Transverse Internal Area
Transverse internal area can be expressed as
Aa = 0.7854 di2 (6)
Aa = transverse internal area (in2)
External circumference can be expressed as
Ce = π do (7)
Ce = external circumference (in)
Internal circumference can be expressed as
Ci = π di (8)
Ci = internal circumference (in)
Estimating Pipe Circumference and Section Area
|Nominal Pipe Size|
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