Pool Service Price Increase Impact Calculator

The decision number is the break-even churn: the largest fraction of your route you can lose on a price increase and still match today's revenue. It is the exact solution of (1 + r)(1 − c) = 1, not the loose "raise 10%, lose up to 10%" rule (which slightly overstates how many you can afford to lose).

r              = percent / 100        (or flat-$ / current price)
R0             = price × accounts                     (current revenue/mo)
P1             = price × (1 + r)                      (new price/account)
R1 (full)      = P1 × accounts                        (new revenue/mo, no churn)
break-even c   = r / (1 + r)
accounts lost  = floor(accounts × c)                  (whole accounts)
monthly change = R1 − R0                              (= price × accounts × r)
annual change  = 12 × monthly change
at your churn  = P1 × (accounts − expected lost)

Example: $100/account/mo × 50 accounts at +10% → break-even churn 0.10 / 1.10 = 9.09%, or floor(50 × 0.0909) = 4 accounts. Revenue rises from $5,000 to $5,500/mo at full retention (+$500/mo, +$6,000/yr). Lose exactly 4 of 50 and you still net 46 × $110 = $5,060/mo — +$60/mo over today.

This is a single-session decision aid, not a customer list, a stored-account record, or a billing engine. It never persists accounts, never tracks churn over time, and never applies the change anywhere. The optional "expected accounts lost" field is a hypothetical input, not a churn log. Benchmark ranges in the hints (8–10% standard, ~$225/mo route average, 0–5 accounts typical churn) are industry ranges, not guarantees — see Sources.