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