A new account starts with two unknowns: how many gallons, and what does it need. The volume and dosing calculators turn label rates into exact ounces at the truck; the route-pricing math turns stops into a salary.
Measure it once: length × width × average depth × 7.48 for rectangles (the volume calculator handles ovals and rounds). Write it on the account notes. From then on every dose is the label rate scaled by that number — no more eyeballing a "big pool" as 30k when it is 19k.
Run the pump turnover calculator with their pool's gallons and the pump's real GPM: if the answer is 14 hours and the timer is set to 4, the green pool is a runtime problem, not a chemistry problem. One screenshot ends that argument.
Work backwards from income: target salary + vehicle, insurance, chemicals, and licensing, divided by realistic billable stops (drive time between stops is not billable). The freelance rate calculator builds that floor; typical routes land $120–180/month for weekly service depending on market and chemical inclusion.