Practical tools grounded in water utility experience.
WaterWorksCalc.com provides practical, planning-level calculation tools for water utility professionals, engineers, operators, and students. The calculators are intended to make common water-system calculations and unit conversions readily accessible while clearly showing the formulas and assumptions used.
The site was created by Paul Selsky, PE, a California civil engineer with 50 years of experience in water supply planning, water utility master planning, hydraulic analysis, water resources, drought planning, and utility management.
Results depend on the accuracy of the information entered and are intended for preliminary planning and checking. Project-specific conditions, applicable standards, and professional engineering judgment should be used for final design decisions.