Flow, pressure and temperature converter

Quick conversions between the flow, pressure and temperature units that appear on water treatment specifications and datasheets.

Flow

Type into any field and the others follow.

L/minm³/hL/sUS GPMm³/dayUS GPD

Pressure

Type into any field and the others follow.

barkPapsiMPam head (water)

Temperature

Type into any field and the others follow.

°C°FK

Formula used

1 m³/h = 16.667 L/min = 0.2778 L/s

1 US gallon = 3.785 L

1 bar = 100 kPa = 14.504 psi = 10.197 m head (water, 4 °C)

°F = °C × 1.8 + 32 · K = °C + 273.15

GPM: US gallons per minute
GPD: US gallons per day
m head: metres of water column

US gallons throughout (membrane datasheets quote GPD in US gallons). Head conversion assumes fresh water at 4 °C; brines and hot water differ slightly with density.

The background

Quick sizing rules of thumb (and the calculators behind them)The first-pass numbers engineers carry in their heads, collected in one place, each with its limits stated and the site calculator that does the full calculation.

Equipment for this duty

Send the water analysis and duty point, and the branch confirms exact selections, pricing and lead times, usually within one working day.

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Results are indicative engineering estimates based on standard formulas and typical assumptions. They are not a design service; confirm any design against a full water analysis and the relevant manufacturer’s data.