Pipe Calculator & Tools

Reference charts, calculators, conversion tables and industry resources for pipe, tubing and steel applications.

Calculators

Interactive tools for common pipe and metric calculations.

Pipe Weight Per Foot Calculator

Calculate the weight of pipe per foot on OD and wall thickness.

Pipe Weight Formula – This formula can be used to determine the weight per foot for any size of pipe with any wall thickness.

The formula is:
Wt/Ft = 10.69 * (OD – Wall Thickness) * Wall Thickness

Barlows Formula

Calculate internal pressure, burst pressure and wall thickness.

Barlow’s Formula is used to determine:

Internal Pressure at Minimum Yield
Ultimate Bursting Pressure
Maximum Allowable Operating Pressure
Mill Hydrostatic Test Pressure

The formula is expressed as P=2St/D, where:

P = pressure, psig
T = nominal wall thickness, in inches(i.e. .375)
D = outside Diameter in inches
S = allowable stress in psi, which depends on the pressure being determined utilizing Yield or Tensile depending on what is trying to be determined

For example:

Internal Pressure at Minimum Yield:

S = SMYS – minimum yield for grade of pipe

Ultimate Bursting Pressure:

S = SMTS – minimum tensile strength for grade of pipe

Maximum Allowable Operating Pressure:

S = SMYS – reduced by a design factor

Mill Hydrostatic Test Pressure:

S = SMYS – reduced by a design factor depending on OD and grade

Inches to Decimals of a Foot Calculator

Convert inches to decimal equivalents of a foot.

This calculates either way (feet/inches to decimal feet or vice versa).
Inches can have a fraction (3 1/4) or decimal (3.25 or 3,25).

Inches	Decimal of a Foot
1 inch	0.0833
2 inches	0.167
3 inches	0.250
4 inches	0.333
5 inches	0.417
6 inches	0.500
7 inches	0.583
8 inches	0.667
9 inches	0.750
10 inches	0.833
11 inches	0.917
12 inches	1.000

To convert further, 1/8″ is almost 1/100th of a foot.

Inches	Decimal of a Foot
1″	0.08
1 1/8″	0.09
1 1/4″	0.10
1 3/8″	0.11
1 1/2″	0.13
1 5/8″	0.14
1 3/4″	0.15
1 7/8″	0.16
2″	0.17

Pipe Size Metric Converter

Convert pipe sizes between standard and metric measurements.

Pipe Size Metric Conversions

Nominal Size		Outside Diameter
mm	Inches	mm	Inches
3	1/8	10.3	.405
6	1/4	13.7	.540
10	3/8	17.1	.675
13	1/2	21.3	.840
19	3/4	26.7	1.050
25	1	33.4	1.315
32	1 1/4	42.2	1.660
40	1 1/2	48.3	1.900
50	2	60.3	2.375
65	2 1/2	73.0	2.875
80	3	88.9	3.500
90	3 1/2	101.6	4.000
100	4	114.3	4.500
125	5	141.3	5.563
150	6	168.3	6.625
200	8	219.1	8.625
250	10	273.0	10.750
300	12	323.8	12.750
350	14	355.6	14.000
400	16	406.4	16.000
460	18	457.2	18.000
510	20	508.0	20.000
560	22	558.8	22.000
610	24	609.6	24.000
660	26	660.4	26.000

Pipe & Data Reference

Charts, reference tables and industry data.

Glossary of Terms

Comprehensive glossary of pipe and pipe-related industry terms.

Digest of Common Pipe Specifications PDF

Summary of common pipe specifications and material grades.

Pipe Chart PDF

Dimensions, schedules and pipe reference data.

General Pipe Information PDF

General information and guidelines on pipe and tubing.

Hardness Conversion Table PDF

Conversion chart for common hardness scales.

Conversions & Formulas

Formulas, conversion tables and reference data.

Pipe & Tubing Formulas PDF

Conversion chart for common hardness scales.

Conversion of Foreign MTR's PDF

Conversion of foreign material test reports.

Metric Conversion Tables

Comprehensive metric conversion reference tables.

Standard to Metric Conversion Chart

Symbol	When You Know	Multiply By	To Find	Symbol
Length
in	inches	25.4	millimeters	mm
ft	feet	0.305	meters	m
yd	yards	0.914	meters	m
mi	miles	1.61	kilometers	km
Area
in²	square inches	645.2	square millimeters	mm²
ft²	square feet	0.093	square meters	m²
yd²	square yard	0.836	square meters	m²
ac	acres	0.405	hectares	ha
mi²	square miles	2.59	square kilometers	km²
Volume
fl oz	fluid ounces	29.57	milliliters	mL
gal	gallons	3.785	liters	L
ft³	cubic feet	0.028	cubic meters	m³
yd³	cubic yards	0.765	cubic meters	m³
Mass
oz	ounces	28.35	grams	g
lb	pounds	0.454	kilograms	kg
T	short tons (2000 lb)	0.907	megagrams (or “metric ton”)	Mg (or “t”)
Temperature
°F	Fahrenheit	(F - 32) × 5 / 9 or (F - 32) / 1.8	Celsius	°C
Illumination
fc	foot-candles	10.76	lux	lx
fl	foot-Lamberts	3.426	candela/m²	cd/m²
Force and Pressure or Stress
lbf	poundforce	4.45	newtons	N
lbf/in²	poundforce per square inch	6.89	kilopascals	kPa

Theoretic Weight of Steel Circles

Weights for solid steel circles by diameter.

Scroll horizontally to view the full table.

Thickness, Inches
DIA	1/8	3/16	1/4	5/16	3/8	7/16	1/2	9/16	5/8	11/16	3/4	15/16	7/8	1
1	.028	.042	.056	.069	.083	.097	.111	.125	.139	.153	.167	.181	.195	.223
2	.111	.166	.222	.278	.333	.389	.441	.502	.557	.612	.668	.724	.779	.892
3	.249	.375	.500	.626	.749	.874	.999	1.13	1.25	1.37	1.50	1.63	1.75	2.01
4	.444	.666	.888	1.11	1.33	1.55	1.76	2.01	2.20	2.45	2.67	2.90	3.12	3.57
5	.693	1.04	1.388	1.74	2.08	2.43	2.78	3.14	3.48	3.89	4.18	4.62	4.87	5.58
6	.998	1.50	2.00	2.51	3.00	3.50	4.00	4.52	5.01	5.51	6.01	6.50	7.01	8.30
7	1.36	2.04	2.72	3.41	4.08	4.76	5.44	6.15	6.82	7.50	8.19	8.87	9.55	10.83
8	1.77	2.66	3.55	4.45	5.33	6.22	7.11	8.03	8.91	9.80	10.69	11.58	12.47	14.28
9	2.25	3.37	4.50	5.69	6.74	7.87	9.00	10.16	11.28	12.41	13.53	14.60	15.78	18.07
10	2.77	4.16	5.55	6.96	8.33	9.72	11.11	12.54	13.93	15.36	16.71	18.10	19.49	22.51
11	3.35	5.04	6.72	8.42	10.07	11.76	13.44	15.18	16.85	18.53	20.21	21.90	23.58	26.99
12	3.99	5.99	8.00	10.12	11.99	13.99	15.99	18.06	20.05	22.05	24.05	26.06	28.06	32.12
13	4.69	7.03	9.38	11.76	14.07	16.42	18.77	21.11	23.53	25.88	28.23	30.58	32.93	37.70
14	5.43	8.16	10.88	13.64	16.32	19.04	21.77	24.58	26.29	30.02	32.74	35.47	38.19	43.72
15	6.24	9.37	12.49	15.66	18.73	21.86	24.99	28.22	31.33	33.46	37.59	40.71	43.84	50.19
16	7	11	15	18	22	25	29	32	35	39	42	46	49	56
17	9	12	16	20	24	28	32	36	40	44	48	52	56	64
18	9	14	18	23	27	32	36	40	45	49	54	58	63	71
19	10	15	20	25	30	35	40	45	50	55	60	65	70	80
20	11	17	23	28	34	39	45	50	55	61	66	72	77	88
21	12	19	25	31	37	43	49	55	61	67	73	79	85	97
22	14	20	27	34	41	47	54	60	67	73	80	87	93	107
23	15	22	30	37	44	52	59	66	73	80	88	95	102	117
24	16	24	32	40	48	56	64	71	79	87	95	103	111	127
25	18	26	35	44	53	61	70	78	86	95	103	112	121	138
26	19	28	38	47	56	66	75	84	93	103	112	121	131	149
27	20	30	41	51	61	71	81	91	101	111	121	131	141	161
28	22	33	44	55	65	76	87	97	108	119	130	141	152	173
29	24	35	47	59	71	82	94	104	116	127	139	151	163	186
30	25	38	50	63	75	88	100	112	124	137	149	162	174	199
31	27	40	54	67	80	94	107	119	133	146	159	173	186	212
32	29	43	57	71	86	100	114	127	141	156	170	184	198	226
33	30	45	61	76	91	106	121	135	150	165	180	196	211	241
34	32	48	65	81	97	113	129	144	150	176	192	208	224	255
35	34	51	68	85	102	119	136	152	169	186	203	220	237	271
36	36	54	72	90	108	126	144	162	180	198	216	234	252	288
37	38	57	76	95	115	134	153	172	191	210	229	248	267	306
38	40	60	80	100	121	141	161	181	201	221	241	261	281	327
39	42	64	85	106	127	148	169	190	212	233	254	275	296	338
40	45	67	89	111	134	156	178	200	223	245	267	289	312	356
41	47	70	94	117	141	164	187	211	234	258	281	304	327	374
42	49	74	98	123	148	172	197	221	246	270	295	319	344	394
43	52	77	103	129	155	160	206	232	258	283	309	335	360	412
44	54	81	108	135	162	188	215	242	269	298	323	350	377	430
45	56	65	113	141	169	197	225	253	282	310	338	366	394	450
46	59	88	118	147	177	206	235	265	294	324	353	383	412	475
47	62	92	123	154	185	215	246	277	308	338	369	399	430	492
48	64	96	128	160	193	225	257	289	321	353	385	417	449	514
49	67	100	134	167	201	234	257	301	334	367	401	434	467	534
50	70	105	139	174	209	224	279	313	348	383	418	452	487	558
51	–	109	145	181	217	253	289	325	362	398	434	470	506	576
52	–	113	151	189	226	263	301	339	376	414	452	489	527	606
53	–	117	156	195	235	273	313	352	391	430	459	508	547	626
54	–	122	162	208	244	284	325	365	406	446	487	527	568	650
55	–	126	168	210	253	295	337	379	421	463	505	547	589	674
56	–	131	175	218	262	305	349	393	436	480	524	567	610	698
57	–	136	181	226	272	317	362	407	453	498	543	587	633	724
58	–	141	187	234	281	328	375	421	468	515	562	609	655	750
59	–	145	194	242	291	339	387	436	484	533	581	620	679	774
60	–	150	200	250	301	351	401	451	501	551	601	651	701	802
61	–	155	207	259	311	362	414	466	518	569	621	673	624	826
62	–	161	214	268	321	375	428	482	535	589	642	695	749	856
63	–	166	221	276	332	387	442	497	553	608	663	718	774	884
64	–	171	228	285	342	399	456	513	570	627	684	741	798	912
65	–	177	235	294	353	412	471	529	588	647	706	754	823	942
66	–	183	243	303	364	425	485	546	607	667	728	788	848	970
67	–	188	280	313	375	438	500	563	625	688	750	812	874	1000
68	–	193	257	322	386	450	515	579	643	706	772	835	900	1030
69	–	199	265	331	396	464	530	596	663	729	795	861	927	1060
70	–	205	273	341	409	477	545	613	682	750	818	886	954	1090
71	–	211	281	351	421	491	561	631	702	772	843	912	982	1122
72	–	217	289	361	433	505	577	649	722	794	866	937	1009	1154
73	–	228	297	371	445	519	593	667	742	816	900	964	1038	1186
74	–	226	305	381	458	534	610	686	763	839	925	990	1066	1220
75	–	–	–	391	470	548	626	704	783	–	–	–	–	–

Reference Tables

Formulas, conversion tables and reference data.

Birmingham Wire Gauge Equivalents (BWG)

Wire gauge sizes and their metric equivalents.

Birmingham Wire Gauge Equivalents

Gauge	Decimal in Inches
28	0.01
27	0.02
26	0.02
25	0.02
24	0.02
23	0.03
22	0.03
21	0.03
20	0.04
19	0.04
18	0.05
17	0.06
16	0.07
15	0.07
14	0.08
13	0.10
12	0.11
11	0.12
10	0.13
9	0.15
8	0.17
7	0.18
6	0.20
5	0.22
4	0.24
3	0.26
2	0.28
1	0.30
0	0.34
0	0.38
0	0.43
0	0.45

Decimal Equivalents of Common Fractions

Fraction	32nd	64th	Decimal
		1/64	.015625
	1/32	2/64	.03125
		3/64	.046875
1/16	2/32	4/64	.0625
		5/64	.078125
	3/32	6/64	.09375
		7/64	.109375
1/8	4/32	8/64	.125
		9/64	.140625
	5/32	10/64	.15625
		11/64	.171875
3/16	6/32	12/64	.1875
		13/64	.203125
	7/32	14/64	.21875
		15/64	.234375
1/4	8/32	16/64	.25
		17/64	.265625
	9/32	18/64	.28125
		19/64	.296875
5/16	10/32	20/64	.3125
		21/64	.328125
	11/32	22/64	.34375
		23/64	.359375
3/8	12/32	24/64	.375
		25/64	.390625
	13/32	26/64	.40625
		27/64	.421875
7/16	14/32	28/64	.4375
		29/64	.453125
	15/32	30/64	.46875
		31/64	.484375
1/2	16/32	32/64	.50
		33/64	.515625
	17/32	34/64	.53125
		35/64	.546875
9/16	18/32	36/64	.5625
		37/64	.578125
	19/32	38/64	.59375
		39/64	.609375
5/8	20/32	40/64	.625
		41/64	.640625
	21/32	42/64	.65625
		43/64	.671875
11/16	22/32	44/64	.6875
		45/64	.703125
	23/32	46/64	.71875
		47/64	.734375
3/4	24/32	48/64	.75
		49/64	.765625
	25/32	50/64	.78125
		51/64	.796875
13/16	26/32	52/64	.8125
		53/64	.828125
	27/32	54/64	.84375
		55/64	.859375
7/8	28/32	56/64	.875
		57/64	.890625
	29/32	58/64	.90625
		59/64	.921875
15/16	30/32	60/64	.9375
		61/64	.953125
	31/32	62/64	.96875
		63/64	.984375

Weight of Water in Foot Lengths of Pipe

Weight of water contained in pipe by size.

Diameter is measured in inches, water in pounds.

Diameter	Water	Diameter	Water	Diameter	Water	Diameter	Water
1/8	0.01	3	3.06	7 3/4	20.45	17	98.4
1/4	0.02	3 1/8	3.33	8	21.79	17 1/2	104.27
3/8	0.05	3 1/4	3.6	8 1/4	23.17	18	110.31
1/2	0.09	3 3/8	3.88	8 1/2	24.6	18 1/2	116.53
5/8	0.13	3 1/2	4.17	8 3/4	26.07	19	122.91
3/4	0.19	3 5/8	4.47	9	27.58	19 1/2	129.47
7/8	0.26	3 3/4	4.79	9 1/4	29.13	20	136.19
1	0.26	3 7/8	5.11	9 1/2	30.73	21	150.15
1 1/8	0.43	4	5.45	9 3/4	32.37	22	164.79
1 1/4	0.53	4 1/4	6.15	10	34.05	23	180.11
1 3/8	0.64	4 1/2	6.89	10 1/2	37.54	24	196.11
1 1/2	0.77	4 3/4	7.68	11	41.2	25	212.8
1 5/8	0.9	5	8.51	11 1/2	45.03	26	230.16
1 3/4	1.04	5 1/4	9.38	12	49.03	27	248.21
1 7/8	1.2	5 1/2	10.3	12 1/2	53.2	28	266.93
2	1.36	5 3/4	11.26	13	57.54	29	286.34
2 1/8	1.54	6	12.26	13 1/2	62.05	30	306.43
2 1/4	1.72	6 1/4	13.3	14	66.73	31	327.2
2 3/8	1.92	6 1/2	14.39	14 1/2	71.59	32	348.65
2 1/2	2.13	6 3/4	15.51	15	76.61	33	370.78
2 5/8	2.35	7	16.68	15 1/2	81.8	34	393.59
2 3/4	2.57	7 1/4	17.9	16	87.16	35	417.08
2 7/8	2.81	7 1/2	19.15	16 1/2	92.69	36	441.26

Decimal Equivalents

Fractional to decimal equivalents reference table.