Flow Rate Chart

GPM Chart for Copper & PEX Pipe
Tubing
Size/Type
Minimum
Flow Rate
1
(gpm)
Maximum
Flow Rate
2
(gpm)
3/8” Copper 1.0 2.0
1/2” Copper 1.6 3.2
3/4” Copper 3.2 6.5
1” Copper 5.5 10.9
1.25” Copper 8.2 16.3
1.5” Copper 11.4 22.9
2” Copper 19.8 39.6
2.5” Copper 30.5 61.1
3” Copper 43.6 87.1
3/8” PEX 0.6 1.3
1/2” PEX 1.2 2.3
5/8” PEX 1.7 3.3
3/4” PEX 2.3 4.6
1” PEX 3.8 7.5
1.25” PEX 5.6 11.2
1.5” PEX 7.8 15.6
2” PEX 13.4 26.8
3/8” PEX-AL-PEX 0.6 1.2
1/2” PEX-AL-PEX 1.2 2.5
5/8” PEX-AL-PEX 2.0 4.0
3/4” PEX-AL-PEX 3.2 6.4
1” PEX-AL-PEX 5.2 10.4
(1) BASED ON 2 FT/SEC
(2) BASED ON 4 FT/SEC