MCPCalc

Water Pressure Calculator

Calculate water pressure loss from elevation, pipe length, and fittings.

Scratchpad (not saved)

PSI
ft
ft

Positive = uphill

Total elbows, tees, valves

What This Calculator Does

Calculate water pressure loss from elevation, pipe length, and fittings.

It combines Supply Pressure, Pipe Length, Pipe Diameter, Elevation Change to estimate Pressure at Fixture, Total Pressure Loss, Elevation Loss.

Formula & Method

Pressure at fixture is P_f=P_s-(P_{elev}+P_{fric}+P_{fit}) where elevation loss is P_{elev}=0.433\cdot Elevation_{ft} and friction/fitting losses are estimated from pipe-size loss factors.

Notation used in the formulas: R = Pressure at Fixture; x_{1} = Supply Pressure; x_{2} = Pipe Length; x_{3} = Pipe Diameter; x_{4} = Elevation Change; x_{5} = Number of Fittings.

Method summary: inputs are normalized to consistent units, core equations are evaluated, then secondary values are derived and rounded for display.

Use this calculator for quick scenario analysis. Start with baseline values, change one driver at a time, and compare how sensitive the results are to each input shown above.

Inputs Used

  • Supply Pressure: Used directly in the calculation.
  • Pipe Length: Used directly in the calculation.
  • Pipe Diameter: Used directly in the calculation.
  • Elevation Change: Positive = uphill
  • Number of Fittings: Total elbows, tees, valves

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