poolcntrl

Free pool chemistry calculator

Enter your latest test readings and get an exact, plain-English dosing plan — computed by the same deterministic chemistry engine that powers the poolcntrl app. Same inputs, same answer, every time.

Your pool

Your readings

Fill in whatever your kit gave you — leave the rest blank. Only got one chlorine number? Put it in free chlorine and leave total blank.

Your plan

Fill in your readings and tap “Get my plan” — the engine reads everything together and tells you exactly what to add.

That dose is real — the same deterministic engine the app runs, same answer every time.