Pool Chemical Cost & Margin Calculator

The hard step incumbents skip is turning a bulk buy into a per-visit cost. Each chemical line divides the container price by how many units are in it to get a cost per unit, multiplies by how much you use per visit, and the lines sum to your chemical cost per visit. Subtract that from your flat rate (on a per-visit basis) and you have the dollar and percent margin remaining.

per chemical line:
  unit cost     = container price / container size
  cost / visit  = unit cost × used per visit
chemical cost / visit = Σ each line's cost / visit

service / visit = (per-month rate) ? rate / visits-per-month : rate
margin $        = service / visit − chemical cost / visit
margin %        = (service − chemical cost) / service       (decimal)
chemical share  = chemical cost / visit ÷ service / visit
monthly margin  = margin $ × visits per month   (on a monthly basis)

Worked example: a $22 bucket of 50 tablets is $22 ÷ 50 = $0.44/tablet; at 6 tablets/visit that's $2.64. Add liquid chlorine ($4 ÷ 1 gal × 0.25 = $1.00) and muriatic acid ($5 ÷ 1 gal × 0.10 = $0.50) for $4.14/visit. On an $18 flat rate the margin is $18 − $4.14 = $13.86 (77.0%), and chemicals are 23.0% of the rate — Healthy.

The Healthy / Thin / Losing-money flag compares your chemical margin against a target you set (60–70% is the typical healthy band): at or above target is Healthy, between break-even and target is Thin, and a negative margin is Losing money. This is chemical margin only — no labor, overhead, drive, or vehicle.

The two levers on this number sit on other pages. On the buying side, which form of chlorine is actually cheapest per ppm is settled by the chlorine type cost comparator, and if tablets are what you carry, the tab count per visit is worked out first and priced here second. On the selling side, a thin chemical margin is usually a rate problem rather than a product problem: rebuild the full per-pool cost stack, then publish the corrected figure on a published rate sheet the whole route works from.