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Gas Pipe Sizing Chart

Match pipe diameter to run length and BTU load so your fire feature gets full gas pressure. Separate tables for natural gas and liquid propane.

Reference chart

Pipe size finder

Find your minimum pipe size

Enter the total BTU rating of everything on the line and the length of the run. The finder reads the same tables printed below.

Minimum pipe size

1-1/4"

Rated 569,000 BTU/hr at the 20 ft row.

Capacity in thousands of BTU/hr

Natural Gas pipe capacity in thousands of BTU per hour, by run length and pipe size
Pipe length (ft)	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	4"
10	108	230	387	793	1,237	2,259	3,640	6,434	Not rated
20	75	160	280	569	877	1,610	2,613	5,236	9,521
30	61	129	224	471	719	1,335	2,165	4,107	7,859
40	52	110	196	401	635	1,143	1,867	3,258	6,795
50	46	98	177	364	560	1,041	1,680	2,936	6,142
60	42	89	159	336	513	957	1,559	2,684	5,647
70	38	82	149	317	476	896	1,447	2,492	5,250
80	36	76	140	239	443	840	1,353	2,315	4,900
90	33	71	133	275	420	793	1,288	2,203	4,667
100	32	68	126	266	411	775	1,246	2,128	4,518
125	28	60	117	243	369	700	1,143	1,904	4,065
150	25	54	105	215	327	625	1,008	1,689	3,645
175	23	50	93	196	303	583	993	1,554	3,370
200	22	47	84	182	280	541	877	1,437	3,160
300	17	37	70	145	224	439	686	1,139	2,539

Pipe length must include additional length for all fittings. Add approximately 5 feet of pipe per fitting.
Natural gas flow is given in thousands of BTU/hr. One cubic foot of natural gas is about 1,000 BTU.
Nominal pressure at the burner for natural gas is 3.5" of water column (typical supply 5" to 7").
Example: a burner that requires 440,000 BTU needs a 1-1/4" pipe for a 20 ft run (highlighted above).

Capacity in thousands of BTU/hr

Liquid Propane pipe capacity in thousands of BTU per hour, by run length and pipe size
Pipe length (ft)	1/2"	3/4"	1"	1-1/4"	1-1/2"	2"	2-1/2"	3"	4"
10	275	567	1,071	2,205	3,307	6,221	10,140	17,990	35,710
20	189	393	732	1,496	2,299	4,331	7,046	12,510	25,520
30	152	315	590	1,212	1,858	3,465	5,695	10,110	20,620
40	129	267	504	1,039	1,559	2,992	4,778	8,481	17,300
50	114	237	448	913	1,417	2,646	4,343	7,708	15,730
60	103	217	409	834	1,275	2,394	3,908	6,936	14,150
70	89	185	346	724	1,086	2,047	3,329	5,908	12,050
80	78	162	307	630	976	1,811	2,991	5,309	10,830
90	69	146	275	567	866	1,606	2,654	4,711	9,613
100	63	132	252	511	787	1,496	2,412	4,281	8,736
125	54	112	209	439	665	1,282	2,083	3,618	7,382
150	48	100	185	390	590	1,138	1,808	3,210	6,549
175	43	90	168	353	534	1,030	1,637	2,905	5,927
200	40	83	155	325	491	947	1,505	2,671	5,450
300	37	77	144	303	458	887	1,404	2,492	5,084

Pipe length must include additional length for all fittings. Add approximately 5 feet of pipe per fitting.
Liquid propane flow is given in thousands of BTU/hr. One cubic foot of propane is about 2,516 BTU.
This chart is for low-pressure LP after regulation. Standard nominal pressure at the burner for propane is 11" of water column.
Example: a burner that requires 440,000 BTU needs a 1" pipe for a 20 ft run (highlighted above).