HDPE Thermoplastic pipe sizes IPS DIPS mm Chart Conversion

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

Iron pipe size, or IPS, is the original pipe sizing system from the early 19^th 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 in the United States.

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″ IPS	0,84″	21,34 mm	20 mm
3/4″ IPS	1,05″	26,67 mm	25 mm
1″ IPS	1,32″	33,40 mm	32 mm
1-1/4″ IPS	1,66″	42,16 mm	40 mm
1-1/2″ IPS	1,90″	48,26 mm	50 mm
2″ IPS	2,38″	60,33 mm	63 mm
2-1/2″ IPS	2,87″	72,90 mm	75 mm
3″ IPS	3,50″	88,90 mm	90 mm
4″ IPS	4,50″	114,30 mm	110 mm
5″ IPS	5,56″	141,22 mm	140 mm
6″ IPS	6,63″	168,28 mm	160 mm
7″ IPS	7,13″	180,98 mm	180 mm
8″ IPS	8,63″	219,08 mm	200 mm
10″ IPS	10,75″	273,05 mm	250 mm
12″ IPS	12,75″	323,85 mm	315 mm
14″ IPS	14,00″	355,60 mm	355 mm
16″ IPS	16,00″	406,40 mm	400 mm
18″ IPS	18,00″	457,20 mm	450 mm
20″ IPS	20,00″	508,00 mm	500 mm
22″ IPS	22,00″	558,80 mm	550 mm
24″ IPS	24,00″	609,60 mm	600 mm
25″ IPS	25,00″	630,00 mm	630 mm
28″ IPS	28,00″	711,20 mm	700 mm
30″ IPS	30,00″	762,00 mm	750 mm
32″ IPS	32,00″	812,80 mm	800 mm
36″ IPS	36,00″	914,40 mm	900 mm
42″ IPS	42,00″	1066,80 mm	1000 mm
48″ IPS	48,00″	1219,20 mm	1200 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″ DIPS	3,96 in.	100.584 mm
4″ DIPS	4.8 in.	121.92 mm
6″ DIPS	6.9 in.	175.26 mm
8″ DIPS	9.05 in.	229.87 mm
10″ DIPS	11.1 in.	281.94 mm
12″ DIPS	13.2 in.	335.28 mm
14″ DIPS	15.3 in.	388.62 mm
16″ DIPS	17.4 in.	441.96 mm
18″ DIPS	19.5 in.	495.3 mm
20″ DIPS	21.6 in.	548.64 mm
24″ DIPS	25.8 in.	655.32 mm
30″ DIPS	32 in.	812.8 mm
36″ DIPS	38.3 in.	972.82 mm
42″ DIPS	44.5 in.	1130.3 mm
48″ DIPS	50.8 in.	1290.32 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 mm	20.3 mm	1/2″ IPS = 21.34 mm
25 mm	25.3 mm	3/4″ IPS = 26.67 mm
32 mm	32.3 mm	1″ IPS = 33.40 mm
40 mm	40.4 mm	1-1/4″ IPS = 42.16 mm
50 mm	50.5 mm	1-1/2″ IPS = 48.26 mm
63 mm	63.4 mm	2″ IPS = 60.33 mm
75 mm	75.5 mm	2-1/2″ IPS = 72.90 mm
90 mm	90.6 mm	3″ IPS = 88.90 mm
110 mm	110.7 mm	4″ IPS = 114.30 mm
140 mm	140.9 mm	5″ IPS = 141.22 mm
160 mm	161 mm	6″ IPS = 168.28 mm
180 mm	181.1 mm	7″ IPS = 180.98 mm
200 mm	201.2 mm	8″ IPS = 219.08 mm
250 mm	249.7 mm	10″ IPS = 273.05 mm
315 mm	314.6 mm	12″ IPS = 323.85 mm
355 mm	354.2 mm	14″ IPS = 355.60 mm
400 mm	399.3 mm	16″ IPS = 406.40 mm
450 mm	449.9 mm	18″ IPS = 457.20 mm
500 mm	499.4 mm	20″ IPS = 508.00 mm
550 mm	563.4 mm	22″ IPS = 558.80 mm
600 mm	629.2 mm	24″ IPS = 609.60 mm
630 mm	633.8 mm	25″ IPS = 630.00 mm
700 mm		28″ IPS = 711.20 mm
750 mm		30″ IPS = 762.00 mm
800 mm	807.2 mm	32″ IPS = 812.80 mm
900 mm	908.1 mm	36″ IPS = 914.40 mm
1000 mm	1009.0 mm	42″ IPS = 1066.80 mm
1200 mm		48″ IPS = 1219.20 mm