One client, five frequencies

Price per visit

$188.08

Cost per visit

$122.25

Revenue per month

$408

Payback

2.8 months

Where the $122.25 goes

Line	Amount
On-site hours (2,500 sq ft × 0.08 × 1.12 soil)	3.73 h
Paid hours incl. 20 min travel × 2 cleaners	4.40 h
Labour incl. 26% burden	$94.25
Supplies and equipment	$28.00
Cost per visit	$122.25

At a 35% margin the visit sells for $188.08 and keeps $65.83. Every-other-week service is 2.17 visits a month, so the client is worth $408 a month and $4,898 a year in revenue.

Area, wage and margin held constant; only frequency moves

Frequency	Hours/visit	Visits/mo	Price/visit	Revenue/mo
Twice weekly	3.33	8.67	$171.94	$1,490
Weekly	3.33	4.33	$171.94	$745
Every two weeks · quoted	3.73	2.17	$188.08	$408
Monthly	4.50	1.00	$223.44	$223
Quarterly	5.67	0.33	$277.60	$93

The per-visit price rises as visits get further apart, because the soil factor does — and monthly revenue falls faster than the price rises. That trade is the whole quote, and it is one table away.

• Your own minimum charge: if it binds, the quote says so instead of quietly raising the margin.
• Zero area or zero minutes per square foot: rejected, because a zero-area quote is not a quote.
• A target margin of 100% or more: rejected rather than producing a divide-by-zero price.
• Payback longer than a year: flagged in the panel with the reason to check churn first.

Contents of the ZIP

File	What it does
index.html	The planner: scope, frequency, cost, price, contract value, frequency table, payback, CSV, print
README.md	The arithmetic and the limits of the model
LICENSE.txt	Single-person licence, editable for your own company
tests/math.test.js	15 assertions: soil factor, travel-weighted cost, minimum charge, payback

Product details and price