Our **gpm to psi calculator** is used to **convert flow rate** (**Gallons Per Minute**) to **pressure** (**Pounds per Square Inch**) using **ΔP = f * (L/D) * ρ * (v²/2)** formula.

Imagine a

garden hosewith a flow rate of10 GPM. TheGPM to PSI converterwould help determine thepressure at the nozzle, considering factors likehose lengthanddiameter.

## GPM to PSI Calculator

GPM converted to | PSI |
---|---|

1 gpm | 2858.33 psi |

2 gpm | 1429.17 psi |

3 gpm | 952.78 psi |

4 gpm | 714.58 psi |

5 gpm | 571.67 psi |

6 gpm | 476.39 psi |

7 gpm | 408.33 psi |

8 gpm | 357.29 psi |

9 gpm | 317.59 psi |

10 gpm | 285.83 psi |

11 gpm | 260.76 psi |

12 gpm | 238.19 psi |

13 gpm | 219.87 psi |

14 gpm | 204.17 psi |

15 gpm | 190.56 psi |

16 gpm | 178.65 psi |

17 gpm | 168.13 psi |

18 gpm | 158.79 psi |

19 gpm | 150.44 psi |

20 gpm | 142.92 psi |

21 gpm | 136.11 psi |

22 gpm | 130.02 psi |

23 gpm | 124.49 psi |

24 gpm | 119.51 psi |

25 gpm | 114.93 psi |

26 gpm | 110.71 psi |

27 gpm | 106.79 psi |

28 gpm | 103.15 psi |

29 gpm | 99.76 psi |

30 gpm | 95.61 psi |

31 gpm | 92.66 psi |

32 gpm | 89.85 psi |

33 gpm | 87.19 psi |

34 gpm | 84.66 psi |

35 gpm | 82.24 psi |

36 gpm | 79.93 psi |

37 gpm | 77.72 psi |

38 gpm | 75.61 psi |

39 gpm | 73.57 psi |

40 gpm | 71.61 psi |

41 gpm | 69.72 psi |

42 gpm | 67.91 psi |

43 gpm | 66.16 psi |

44 gpm | 64.47 psi |

45 gpm | 62.85 psi |

46 gpm | 61.28 psi |

47 gpm | 59.76 psi |

48 gpm | 58.29 psi |

49 gpm | 56.87 psi |

50 gpm | 55.49 psi |

51 gpm | 54.15 psi |

52 gpm | 52.85 psi |

53 gpm | 51.59 psi |

54 gpm | 50.36 psi |

55 gpm | 49.16 psi |

56 gpm | 48.00 psi |

57 gpm | 46.86 psi |

58 gpm | 45.75 psi |

59 gpm | 44.67 psi |

60 gpm | 43.61 psi |

61 gpm | 42.58 psi |

62 gpm | 41.57 psi |

63 gpm | 40.59 psi |

64 gpm | 39.63 psi |

65 gpm | 38.69 psi |

66 gpm | 37.78 psi |

67 gpm | 36.89 psi |

68 gpm | 36.02 psi |

69 gpm | 35.17 psi |

70 gpm | 34.34 psi |

71 gpm | 33.53 psi |

72 gpm | 32.74 psi |

73 gpm | 31.97 psi |

74 gpm | 31.22 psi |

75 gpm | 30.49 psi |

76 gpm | 29.77 psi |

77 gpm | 29.08 psi |

78 gpm | 28.40 psi |

79 gpm | 27.74 psi |

80 gpm | 27.10 psi |

81 gpm | 26.48 psi |

82 gpm | 25.87 psi |

83 gpm | 25.28 psi |

84 gpm | 24.71 psi |

85 gpm | 24.15 psi |

86 gpm | 23.61 psi |

87 gpm | 23.08 psi |

88 gpm | 22.57 psi |

89 gpm | 22.07 psi |

90 gpm | 21.58 psi |

91 gpm | 21.11 psi |

92 gpm | 20.64 psi |

93 gpm | 20.19 psi |

94 gpm | 19.76 psi |

95 gpm | 19.33 psi |

96 gpm | 18.92 psi |

97 gpm | 18.52 psi |

98 gpm | 18.13 psi |

99 gpm | 17.75 psi |

100 gpm | 17.38 psi |

## GPM to PSI Conversion Chart

GPM | PSI |
---|---|

100 gpm | 17.38 psi |

150 gpm | 11.59 psi |

200 gpm | 8.69 psi |

250 gpm | 6.91 psi |

300 gpm | 5.77 psi |

350 gpm | 5.03 psi |

400 gpm | 4.34 psi |

450 gpm | 3.76 psi |

500 gpm | 3.38 psi |

550 gpm | 2.93 psi |

600 gpm | 2.56 psi |

650 gpm | 2.25 psi |

700 gpm | 1.98 psi |

750 gpm | 1.74 psi |

800 gpm | 1.53 psi |

850 gpm | 1.34 psi |

900 gpm | 1.17 psi |

950 gpm | 1.01 psi |

1000 gpm | 0.87 psi |

## GPM to PSI Conversion Formula

The conversion from **GPM to PSI** formula is the **Darcy-Weisbach equation**:

`ΔP = f `*(L/D)* ρ * (v²/2)

Where:

ΔPis thepressure drop(PSI)fis theDarcy friction factorLis thepipe length(feet)Dis thepipe diameter(feet)ρis thefluid density(lb/ft³)vis thefluid velocity(ft/s)

To use this formula, we need to convert **GPM** to **fluid velocity** (v):

`v = Q / A`

Where:

Qis theflow ratein ft³/s (GPM * 0.002228)Ais thepipe cross-sectional areain ft² (π * (D/2)²)

For a **1-inch diameter pipe** with a flow rate of **20 GPM** and length of **100 feet**:

Convert

GPM to ft³/s: 20 * 0.002228 = 0.04456 ft³/sCalculate

pipe area: π * (1/24)² = 0.00545 ft²Calculate

velocity: 0.04456 / 0.00545 = 8.18 ft/sUse the

Darcy-Weisbach equationto findΔP

## How do you convert GPM to PSI?

**Gather system information**: Collect data on**pipe diameter**,**length**,**material**, and**fluid properties**.**Calculate fluid velocity**: Use the formula v = Q / A to find velocity from**GPM**.**Determine the Reynolds number**: This helps in finding the**friction factor**.**Find the friction factor**: Use the**Moody diagram**or appropriate equations based on the**Reynolds number**and**pipe roughness**.**Apply the Darcy-Weisbach equation**: Calculate the**pressure drop**using the formula.

Let’s convert **15 GPM** to **PSI** for a **3/4-inch pipe** that’s **50 feet long**:

System info: D = 0.75 inches (0.0625 feet), L = 50 feet, water at68°F(ρ ≈ 62.4 lb/ft³)

Velocity: v = (150.002228) / (π(0.0625/2)²) ≈ 10.63 ft/s

Reynolds number: Re = (ρvD) / μ (μ is dynamic viscosity)Find

friction factor fusing theReynolds numberandrelative roughnessApply

Darcy-Weisbach: ΔP = f(50/0.0625)62.4 * (10.63²/2)

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