Flow unit converter

Pump and piping specs mix four volumetric units: m³/h (the Indian standard), litres per minute (dosing pumps, small transfer lines), litres per second (pipe sizing formulas) and US GPM (imported equipment, US-style curves). The relationships are exact multiples of 1000, 60 and 3.785, so a wrong unit in a vendor comparison can mislead by a factor of four or more.

One m³/h equals 16.667 L/min, 0.2778 L/s and 4.403 US GPM. The converter shows all of them for any entry, and highlights the source row so the reading stays anchored.

Chemical dosing, boiler feed and material-balance calculations work in mass, not volume. Mass flow in kg/h is volumetric flow in m³/h × 1000 × specific gravity. The SG makes the difference: 25 m³/h of water is 25,000 kg/h, but the same volume of 50 % caustic soda is 37,500 kg/h — which is why dosing and neutralisation calculations must convert through SG rather than assume water.

Toggle mass flow in the converter and enter your liquid’s SG to get the kg/h row alongside all volumetric units.

Two traps hide in "gallon" ratings. First, US versus imperial gallons differ by about 20 % — a 100 imp. gal/min rating is 120 US GPM. Second, many old datasheets quote gallons per hour for pumps that actually run in gallons per minute. The converter uses US gallons and labels the row clearly; when comparing any curve, confirm the gallon type first.

Flow is the starting input for every other pump calculation. With the flow in m³/h, the head in metres and the liquid SG, the pump power calculator returns kW, the head-loss tool returns friction, and the affinity calculator predicts what a speed change does to the flow. Teflow’s engineers use the same sequence when sizing chemical, dairy and water-treatment pumps — and the flow converter makes sure every number lands in the same units first. Call +91 98251 62709 for sizing support.