Hot Tub and Spa Service Pricing Calculator
Work out how much to charge for hot tub service: price routine visits, drain-and-refill jobs, filter replacements and chemicals from an itemized cost stack.
price = (baseCost + overhead) / (1 - target margin)
How?
How this is calculated
The recommended price is built bottom-up from a per-spa cost stack, not divided down from a fleet total. Each routine-visit line is expanded to a monthly figure using a visits-per-month multiplier: weekly = 4.3 (52 / 12), bi-weekly = 2.15, monthly = 1.
chemicals = chemCost/visit * visits/mo
onsiteLabor = (minutes on site / 60) * loaded rate * visits/mo
driveLabor = (drive minutes / 60) * loaded rate * visits/mo
vehicle = miles round-trip * $/mile * visits/mo
drainAndRefill = (drainMin/60 * rate + waterCost) * drains/yr / 12
filterReplace = (filterCost + filterMin/60 * rate) * replacements/yr / 12
overhead = flat $/spa OR % of price (closed form)
cost = all lines summed
price = cost / (1 - target margin) (margin mode)
= cost * (1 + target markup) (markup mode)
displayPrice = round(price / 5) * 5 (display only)Drain-and-refill and filter replacement are periodic costs amortized to a monthly figure. A quarterly drain at $30 in labor and $10 in water adds $13.33/mo to the cost stack, not $40 in the month it happens. This keeps the monthly price stable and profitable across the full year.
When overhead is set as a % of price, price depends on
overhead which depends on price. The calculator resolves it in one
closed-form step
(price = baseCost / ((1 - margin) - overhead%) in margin mode)
rather than looping. If the overhead % is too high to leave room for the
margin, no price can be set and the calculator says so.
The default costs are directional starting points, not market-sourced constants. Every input is editable; adjust them to your own numbers. For the actual dose arithmetic on each visit, use the spa and hot tub chemical dose calculator. For the pool-scale version of this same pricing exercise, the sibling rung is the pool service price calculator.
Formula: price = (baseCost + overhead) / (1 - target margin)