This fluid flow rate calculator can help you calculate the fluid flow rate, pipe diameter or the velocity in multiple measurement units if you know any 2 variables. Discover below the tool all the formulas applicable.

Instruction: Please input only 2 out of the 3 fields available to find the desired one!

Pipe diameter:*
Speed:*
Flow Rate:*

## How does this fluid flow rate calculator work?

Depending on the variable to be computed this fluid flow rate calculator applies these formulas, while the user is requested each time to input 2 out of the 3 fields available (the unknown variable field should remain blank):

■ In case the pipe diameter (P) needs to be calculated the formula that is used is:

P = √(4F/πV)

■ When you want to solve for speed/velocity (V) the formula applicable is:

V = 4F/πP2

■ In order to calculate the flow rate (F) the following equation is suitable:

F = 1/4πP2V

Each of the three figures can be processed in different measurement units since this fluid flow rate calculator performs the conversion to the default unit by multiplying the value specified with one of the factors given in the tables below per each dimension:

■ Pipe diameter is by default set up to meters (m) thus from any other measurement unit it is converted to m by applying the following conversion rules:

 From: To m: m 1 cm 0.01 mm 0.001 ft 0.3048 in 0.0254 yd 0.9144

Speed/velocity is initially set up to meters per second (m/s) thus in the calculation phase any other unit selected is converted to m/s:

 From: To m/s: m/s 1 km/s 1000 km/min 16.66666667 km/h 0.277777778 m/min 0.016666667 m/h 0.000277778 cm/s 0.01 cm/min 0.000166667 cm/h 0.00000277778 mm/s 0.001 mm/min 0.0000166666667 mm/h 0.000000277778 mps (miles/s) 1609.344 mpm (miles/min) 26.8224 mph 0.44704 yd/s 0.9144 yd/min 0.01524 yd/h 0.000254 ft/s 0.3048 ft/min 0.00508 ft/h 0.00008466667 in/s 0.0254 in/min 0.000423333 in/h 0.00000705556

■ Flow rate is by default selected to be expressed in m3/s but in case other unit is chosen from the drop down list the calculator will convert it to m3/s:

 From: To m3/s: m3/s 1 m3/min 0.016666667 m3/h 0.000278 l/s 0.001 l/min 0.00001667 l/h 0.000000278 cm3/s 0.000001 cm3/min 0.000000017 cm3/h 0.000000000278 mm3/s 0.000000001000 mm3/min 0.0000000000166666667 mm3/h 0.000004 ft3/s 0.028316847 ft3/min 0.0004719474 ft3/h 0.000007865791 in3/s 0.00001639 in3/min 0.000000273117733 in3/h 0.000000004552 yd3/s 0.764554858 yd3/min 0.012742581 yd3/h 0.000212376 US gal/s 0.003785412 US gal/min 0.00006309 US gal/h 0.000001052

Within the results area, each variable calculated is displayed in all the measurements units available.

13 Aug, 2015