HDPE PIPE SIZE CHART CONVERSION (IPS/DIPS/mm)

IPS PIPE SIZES (INCHES) – (Iron Pipe Size based)

Iron pipe size, or IPS, is the original pipe sizing system from the early 19th century. IPS is still the predominant sizing system used in most industries including oil and gas gathering, gas distribution, mining, and some potable water and wastewater applications.

American Standard Size
Nominal Pipe Size IPS (Known as Inches)
Real Size Outside Diameter (OD)
(Inches)
Real Outside Diameter (OD)
(mm) 1 Inch = 25,4 mm
Closer Metric Pipe size or
(mm) (NOT THE SAME)
1/2″ IPS0,84″21,34 mm20 mm
3/4″ IPS1,05″26,67 mm25 mm
1″ IPS1,32″33,40 mm32 mm
1-1/4″ IPS1,66″42,16 mm40 mm
1-1/2″ IPS1,90″48,26 mm50 mm
2″ IPS2,38″60,33 mm63 mm
2-1/2″ IPS2,87″72,90 mm75 mm
3″ IPS3,50″88,90 mm90 mm
4″ IPS4,50″114,30 mm110 mm
5″ IPS5,56″141,22 mm140 mm
6″ IPS6,63″168,28 mm160 mm
7″ IPS7,13″180,98 mm180 mm
8″ IPS8,63″219,08 mm200 mm
10″ IPS10,75″273,05 mm250 mm
12″ IPS12,75″323,85 mm315 mm
14″ IPS14,00″355,60 mm355 mm
16″ IPS16,00″406,40 mm400 mm
18″ IPS18,00″457,20 mm450 mm
20″ IPS20,00″508,00 mm500 mm
22″ IPS22,00″558,80 mm550 mm
24″ IPS24,00″609,60 mm600 mm
25″ IPS25,00″630,00 mm630 mm
28″ IPS28,00″711,20 mm700 mm
30″ IPS30,00″762,00 mm750 mm
32″ IPS32,00″812,80 mm800 mm
36″ IPS36,00″914,40 mm900 mm
42″ IPS42,00″1066,80 mm1000 mm
48″ IPS48,00″1219,20 mm1200 mm

DIPS PIPE SIZES (INCHES) – (Ductile Iron Pipe Size based)

Ductile iron pipe size, or DIPS, was created in 1948 when iron pipe wall thicknesses were more controllable and a required inside diameter (ID) could be maintained. The DIPS pipe sizing system is the predominant sizing system used in potable water and sewer applications still today.

Nominal Pipe Size DIPS (Known as Inches)Real Size Outside Diameter (OD)
(Inches)
Real Outside Diameter (OD) (mm) 1 Inch = 25,4 mm
3″ DIPS3,96 mm100,584 mm
4″ DIPS4,8 mm121,92 mm
6″ DIPS6,9 mm175,26 mm
8″ DIPS9,05 mm229,87 mm
10″ DIPS11,1 mm281,94 mm
12″ DIPS13,2 mm335,28 mm
14″ DIPS15,3 mm388,62 mm
16″ DIPS17,4 mm441,96 mm
18″ DIPS19,5 mm495,3 mm
20″ DIPS21,6 mm548,64 mm
24″ DIPS25,8 mm655,32 mm
30″ DIPS32 mm812,8 mm
36″ DIPS38,3 mm972,82 mm
42″ DIPS44,5 mm1130,3 mm
48″ DIPS50,8 mm1290,32 mm

METRIC PIPE SIZES (mm) – (European sizes)

mm Pipe DN
Nominal Diameter
mm OD
Outside Diameter
Closer Inches IPS Pipe size (NOT THE SAME)
20 mm20,31/2″ IPS = 21,34 mm
25 mm25,33/4″ IPS = 26,67 mm
32 mm32,31″ IPS = 33,40 mm
40 mm40,41-1/4″ IPS = 42,16 mm
50 mm50,51-1/2″ IPS = 48,26 mm
63 mm63,4 mm2″ IPS = 60,33 mm
75 mm75,52-1/2″ IPS = 72,90 mm
90 mm90,6 mm3″ IPS = 88,90 mm
110 mm110,7 mm4″ IPS = 114,30 mm
140 mm140,95″ IPS = 141,22 mm
160 mm161 mm6″ IPS = 168,28 mm
180 mm181,17″ IPS = 180,98 mm
200 mm201,2 mm8″ IPS = 219,08 mm
250 mm249,7 mm10″ IPS = 273,05 mm
315 mm314,6 mm12″ IPS = 323,85 mm
355 mm354,2 mm14″ IPS = 355,60 mm
400 mm399,3 mm16″ IPS = 406,40 mm
450 mm449,9 mm18″ IPS = 457,20 mm
500 mm499,4 mm20″ IPS = 508,00 mm
550 mm5634,4 mm22″ IPS = 558,80 mm
600 mm629,2 mm24″ IPS = 609,60 mm
630 mm633,8 mm25″ IPS = 630,00 mm
700 mm28″ IPS = 711,20 mm
750 mm30″ IPS = 762,00 mm
800 mm807,2 mm32″ IPS = 812,80 mm
900 mm908,1 mm36″ IPS = 914,40 mm
1000 mm1009,0 mm42″ IPS = 1066,80 mm
1200 mm48″ IPS = 1219,20 mm
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