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Metric to Imperial Pipe Conversion

When the industry moved from imperial to metric sizing it was done in an uncoordinated fashion. Consequently sizes are different for plastic and steel products! The following is a quick conversion chart showing sizes of stainless steel, mild steel, plastic and copper tube or pipe.

Metric to Imperial Pipe Conversion
Imperial Nominal Bore
Mild & Stainless Steel
Metric Nominal Bore
Mild & Stainless Steel
Metric Actual O.D.
PVC, ABS, MDPE,POLY PHILMAC
Metric O.D.
Copper Tube
Metric
Thickness
1/32" 0.80mm
1/16" 1.59mm
1/8" 6mm 6mm 3.18mm
1/4" 8mm 12mm 8mm 6.30mm
3/8" 10mm 16mm 10mm 9.50mm
1/2" 15mm 20mm 15mm 12.70mm
3/4" 20mm 25mm 22mm 19.05mm
1" 25mm 32mm 28mm 25.40mm
1 1/4" 32mm 40mm 35mm 31.75mm
1 1/2" 40mm 50mm 42mm 38.10mm
2" 50mm 63mm 54mm 50.80mm
2 1/2" 65mm 75mm 67mm 63.50mm
3" 80mm 90mm 76mm 76.20mm
4" 100mm 110mm 108mm 101.60mm
5" 125mm 125mm 133mm 127.00mm
6" 150mm 140/160mm 159mm 152.40mm
7" 175mm 160mm
8" 200mm 200mm
9" 225mm 225mm
10" 250mm 250mm
11" 275mm 280mm
12" 300mm 315mm
14" 350mm
16" 400mm
18" 450mm
20" 500mm
22" 550mm
24" 600mm

Conversions are based on a nominal 25mm or exact 25.4mm to 1 inch

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