WaterCalculator

Water Pressure Calculators

15 tools for measuring and troubleshooting water pressure — PSI, depth, head conversions, velocity and elevation head, friction and fitting losses, and pressure around the home. Each runs on the recognised standard formula, with the working and sources shown.

John Mac, PE Curated and reviewed by John Mac, PE, Water Systems Specialist.

Pressure & depth

Water Pressure CalculatorWater pressure from the height of a water column. PSI CalculatorConvert PSI to and from other pressure units. Water Pressure at DepthPressure at any depth below the surface. Static Pressure CalculatorPressure in a still, non-flowing system.

Head & conversions

Pressure to Head CalculatorConvert pressure into equivalent feet of head. Head to Pressure CalculatorConvert feet of head into equivalent pressure.

Velocity & elevation head

Elevation Head CalculatorPressure change from an elevation difference alone. Velocity Head CalculatorThe head equivalent of a fluid's velocity.

Friction & pressure loss

Friction Head LossHead lost to friction along a pipe run. Pressure Loss CalculatorPressure drop across a run of pipe. Pipe Pressure DropPressure drop through a pipe by flow and diameter. Pressure Drop Across a FittingPressure lost through valves, elbows and tees.

Around the home

Water Pressure by FloorHow pressure changes climbing a multi-story building. Gravity-Feed PressurePressure available from a gravity-fed supply. Shower Pressure CalculatorExpected pressure at a showerhead.

About our pressure calculators

These tools rest on the standard hydrostatic relationship between pressure and column height, along with the Hazen–Williams and Darcy–Weisbach equations for friction losses in pipes and fittings. Every figure is verified against the live calculator, and each page lists its sources. For the full detail of how we build and check them, see our methodology.

Browse other categories

ScienceDensity, weight, heat and properties. FlowPipe flow, velocity, friction loss. UsageHousehold use, footprints, savings. CostBills, rates and running costs. TreatmentSoftening, filtration, chemistry. PumpsSizing, head, horsepower, NPSH. DrainageSlopes, drain sizing, stormwater.