SettingsSettings for this calculationUS
The weekday of the first day on site.
If it is not a working day, the count begins on the next working day and the calendar days before it still count toward the total.
Which days of the week the site works.
A six-day week recovers time on long jobs and costs overtime or a second crew; seven days is usually shift work on a tight programme.
The duration in working days, from the programme or a duration calculator.
Whole working days. A part day counts as a day, because a finish is a date.
Public holidays and shutdown days inside the period that would otherwise have been worked.
Count only those that land on a day of the working week. A holiday on a Saturday does not delay a Monday-to-Friday job.
Calendar days from start to finish
29 days
Starting on a Monday, 20 working days and 1 holiday finish on a Monday, the 29th calendar day counting the start day as the first.
- Working days, holidays included
- 21 days
- Days not worked in between — weekends, rest days and holidays
- 9 days
- Calendar weeks
- 4.14 weeks
They open the calculator with your figures already in it
Working Days to Finish Calculator: 29 days — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Calendar counting as programmes use it: each calendar day from the start is counted, a day counts as worked only if it falls in the working week, and the finish is the day on which the required working days — plus any holidays that fall on working days — have been worked
Inputs used
- Day the Work Starts
- Monday
- Working Week
- Monday to Friday
- Working Days Needed
- 20
- Holidays Falling on Working Days
- 1
Intermediate steps
- Working days, holidays included
- 21 days
- Days not worked in between — weekends, rest days and holidays
- 9 days
- Calendar weeks
- 4.14 weeks
Confidence note: Starting on a Monday, 20 working days and 1 holiday finish on a Monday, the 29th calendar day counting the start day as the first.
What this calculation does not cover
- It counts weekdays, not dates, so it cannot know which holidays fall inside the period — you tell it how many.
- Weather days, which an honest programme allows for on outdoor work, are not included; add them as holidays if you want them in the count.
- The start day counts as day one whether or not it is worked.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-22 · v1.0.0
Regulatory standards & verification citations1
- Calendar counting as programmes use it: each calendar day from the start is counted, a day counts as worked only if it falls in the working week, and the finish is the day on which the required working days — plus any holidays that fall on working days — have been worked
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