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Plumbing Pipe Size Calculator

Pipe Specifications and Freshwater Weight Calculator, Hole Saw Drilling Standard Guide

We verify the precise outer diameter (OD] and inner diameter (ID] of pipes by material, such as steel (SPP], stainless steel (STS], PVC, and PB, and instantly calculate the weight when the pipes are filled with water. Check the recommended hole saw specifications required for penetrating walls or slabs at a glance to prepare for perfect installation without any errors.

Basis for calculating pipe weight and drilling

Calculate the values ​​required for practical work based on the pipe's outer and inner diameter data.

Calculate recommended hole saw specifications
Hole saw specifications = Pipe outer diameter (OD] + Allowance (approx. 5~10mm]
Freshwater weight (water weight] calculation
Water weight (kg] = {Inner diameter (m]/2}² × π × Pipe length (m] × 1,000

This is the weight of the pure water excluding the weight of the piping itself, and is used as basic data when determining the spacing of supports (hangers].

Detailed Guide to Calculator Input Items

Please select the item below to verify the exact specifications.

Selection of pipe material and nominal diameter

Since the actual outer diameter may vary depending on the material (A], such as SPP, PVC, and STS, you must select the material first.

Input pipe length

Enter the total length of the piping for which weight calculation is required. Please enter the sum of the inter-floor height or horizontal extension length.

Comparison Table of Nominal Sizes and External Diameters (OD] by Major Piping Materials

Title (A] inch Outer diameter (mm] Screw arithmetic
15A 1/2" 21.7 14
20A 3/4" 27.2 14
25A 1" 34.0 11
50A 2" 60.5 11

Expert Practical Know-how & Checklist

This is a key point that is easy to overlook during plumbing construction and design.

  • Distinction between pipe outer diameter (OD] and inner diameter (ID]

    Pipe fittings (elbows, tees] should be based on the outer diameter, while flow rate calculations should be based on the inner diameter. This calculator provides both figures to assist with the design.

  • Selection of penetration sleeves and hole saws

    For pipes containing insulation, the hole saw must be enlarged by the thickness of the insulation (usually 10 to 25 mm] to make the hole.

  • Pipe support (hanger] load review

    You must adjust the spacing of the supports considering the weight when the pipe is full of water to prevent sagging or damage to the pipe.

Frequently Asked Questions (FAQ]

  • Q. Are 20A and 20mm the same standard?
  • A. The designation (A] is just a name and not the actual outer diameter. For example, the actual outer diameter of a 20A pipe is approximately 26 to 27 mm depending on the material.
  • Q. What is the hole size when insulating pipes?
  • A. The hole saw specifications suggested by the calculator are based on 'bare pipes'. For insulation, please use a hole saw that is twice the thickness of the insulation material.
  • Q. Does the weight change during the hydrostatic pressure test?
  • A. Since the density of water is nearly constant, the weight itself does not change significantly even if the water pressure increases. However, the pressure load on the piping increases.