Working Days Calculator
Enter the calendar days in your range, any public holidays, and your work-days-per-week to estimate the number of working days — for deadlines, contracts, and project timelines.
A standard US work year has 249 working days — never assume a calendar month equals 22 business days.
249
working days in a standard US year after federal holidays
5/7
weekday-to-calendar-day ratio — the basis of the estimate
11
US federal public holidays in 2026
Working days in planning and contracts
Estimate business days for any range.
Why the ratio method works
Any stretch of calendar days contains roughly the same share of weekdays as a single week, because weeks are the repeating unit of the work calendar. Multiplying by your work-days-per-week ÷ 7 captures that share, accurate to within about ±1 day for most ranges.
Built for non-standard weeks
Not everyone works Monday–Friday. Retail, hospitality, and healthcare frequently run 6-day weeks. Set your real work days per week and the estimate adjusts — a 6-day week produces noticeably more working days over the same calendar span.
Use working days for contracts
Contracts, legal notices, and SLAs usually specify deadlines in business days, not calendar days. Always confirm which one a deadline means before planning — misreading the distinction is a common source of missed deadlines and disputes.
How the Working Days Calculator Works
Formula
Weekdays = Calendar Days × (Work Days per Week ÷ 7)
Working Days ≈ Weekdays − Public Holidays
Working Weeks = Working Days ÷ Work Days per WeekEnter the calendar days
The total days in your range (not counting the start date).
Add public holidays
How many bank/federal holidays fall inside the range.
Set work days per week
5 for a standard week, 6 for many retail/hospitality schedules.
The calculator multiplies your calendar days by the share of the week you work, then subtracts public holidays. This is an approximation accurate to within about ±1 day for most ranges — for legal precision over short periods, count each weekday manually.
Because the work-days-per-week is adjustable, the tool handles non-standard schedules: a 6-day work week produces more working days over the same span than the default 5-day week.