Converters and Calculators

Flow Rate Converter

Our unit converters allow you to convert a multitude of flow rate and pressure units to a high degree of accuracy.

/ equal to...

Pressure Unit Converter equal to...

Friction Head Loss Calculator

Friction head loss occurs whenever fluid travels through a pipe. The level of friction loss depends on a number of factors:

  1. The material the pipe is made from - a rougher inner pipe surface will result in a greater friction loss.
  2. The velocity of the liquid through the pipe - the higher the velocity, the greater the effect of friction on the liquid. This can be worked out from the flow rate and pipe diameter.
  3. The total length of pipework - the longer the pipe, the more friction loss will occur.

Dutypoint have created a helpful calculator which will estimate the level of friction head loss in your system. Just input the values below and the calculator will instantly give you result.

Pipe Material
Pipe Inside Diameter
Pipe Length
Flow Rate
Pipe Material
Pipe Inside Diameter
Pipe Length
Pipe Length
Friction Head Loss


To convert to litres/sec

iGPM x 0.0757
m3/hr x 0.278
m3/min x 16.68
Metric tonnes/hr x 0.278 ÷ S.G.
Litres/min x 0.0167
Kilogrammes/hr x 0.000278 ÷ S.G.
USGPM x 0.063
Cubic feet/sec x 28.3
Cubic feet/min x 0.47
British tons/hr x 0.282 ÷ S.G.
British barrels/hr x 0.453

To convert to m3/hr

iGPM x 0.273
m3/hr x 3.6
m3/min x 0.06
Metric tonnes/hr x 1 ÷ S.G.
Litres/min x 60
Kilogrammes/hr x 0.001 ÷ S.G.
Kilogrammes/sec x 3.6 ÷ S.G.
USGPM x 0.227
Cubic feet/sec x 102
Cubic feet/min x 1.7
British tons/hr x 1.015 ÷ S.G.
British barrels/hr x 0.163

Pumping head conversions

To convert to metres

Feet x 0.305
kg/cm2 x 10 ÷ S.G.
PSI x 0.704 ÷ S.G.
Inches Hg x 0.345 ÷ S.G.
cm Hg x 0.1362 ÷ S.G.
Atmospheres x 10.35 ÷ S.G.
KN/m2 (KPa) x 0.102 ÷ S.G.
Bar x 10.2 ÷ S.G.

Power conversions

To convert to kilowatts

Horsepower x 0.746

To convert to horsepower

Kilowatts ÷ 0.746

KW =

m3/hr X total head in metres X S.G. ÷ 367.87 X pump efficiency


IMP.GPM X total head in ft X S.G. 10 ÷ 33,000 X pump efficiency