The calculator determine the requried velocity throguh a pipe to achive a desire flow rate.

The Hazen-Williams method is valid for water flowing at ordinary temperatures of 4 to 25 oC through pressurized pipes.

The Darcy-Weisbach method is generally considered more accurate than the Hazen-Williams method. Additionally, the Darcy-Weisbach method is valid for any liquid or gas.
Major Loss Darcy-Colbrook Calculator

The Darcy-Weisbach method is generally considered more accurate than the Hazen-Williams method. This calculator uses the Swamee Jain apprximation for the friction factor.
Major Loss Darcy-Swamee Calculator

This calculator compares methods for calculating head loss in pressure pipes.

This calculator will the flow through an Orifice and the pressure drop.
Used for flow measurement and also to discharge water at a known rate.

Convert Bin to Hex and Hex to Bin

This calculator will provide the resesotr value for resister,
from forward voltage and current.