Four weeks is not a month
Three weekly services are 156 annual visits and an average of 13 monthly visits—not 12—when the agreement covers 52 weeks.
Free schedule tool
Cleaning service frequency calculator
Convert weekly service promises into annual and monthly visit counts without assuming every month has four weeks.
Annual services156
Average calendar month13 visitsAnnual services ÷ 12
Per billed month13 visitsUse only when billing fewer than 12 months
Formula
average monthly visits = weekly visits × working weeks ÷ 12Adjust for shutdowns
Use actual working weeks when a school, office, or seasonal site closes during the contract year.
Match billing and service
A level monthly invoice can still represent uneven calendar-month visit counts. Document the annual service commitment clearly.