A supplement, with a defined scope
Choose the learning support you need.
Checked September 12, 2026 using published primary sources.
WaterOperator.org
Its Basic Math for Drinking Water Operators in Massachusetts course is listed as free with twelve lessons. It covers broader math principles, conversions, formulas and application examples. Use the official course page to check its enrollment and credit details.
American Water College
American Water College lists unit-conversion and broader water-math courses, with lesson material and structured course offerings. This is a different scope from a small interactive arithmetic tool.
California conversion sheets
Official operator sheets provide formulas and rounded conversion factors. They are useful references. FlowMath explains its own calculation factors and does not claim its drills reproduce an examination or its marking rules.
Official drinking-water conversion sheet
FlowMath
Free worked calculations and sixteen original drills, without enrollment. It supplements broader learning; it is not a credentialed course or an operational decision system.