Business Days Calculator
Count the working days between two dates with weekends and public holidays removed, and see exactly which holidays were removed, by name. US federal and UK bank holidays are computed from their rules, including the substitute days when one falls at a weekend.
Working daysPick a start date and an end date.
United States. The 11 federal holidays, shifted to the observed weekday. The end date is counted.
Every excluded day is named. Most calculators return a number you cannot check. This one lists the holidays it removed, with the date each one fell on and the day it substitutes for when a holiday landed at a weekend, so a wrong answer is visible instead of silent. Whether the end date counts is your choice, not an assumption: “five business days from Monday” usually excludes the start and includes the end, while “working days in September” counts both ends.
Common questions
- How are business days counted?
- Every day from the start date to the end date is examined; Saturdays and Sundays are dropped, then any public holiday for the region you chose is dropped. The remainder is the answer. The tool lists each excluded holiday with its name and date, so you can check the result rather than trust it.
- Does it include the end date?
- That is your choice, and it matters more than people expect. "Five business days from Monday" usually means the deadline falls on the following Monday (excluding the start, including the end), while "how many working days in September" counts both ends. The toggle is explicit because contracts and SLAs differ on this and the off-by-one is the most common mistake in the whole calculation.
- Which holidays are included?
- For the US, the eleven federal holidays: New Year's Day, Martin Luther King Jr. Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas. For the UK, the England and Wales bank holidays including Good Friday and Easter Monday, which move each year with the ecclesiastical Easter calculation. You can also switch holidays off entirely and count weekdays only.
- What happens when a holiday falls on a weekend?
- It gets observed on an adjacent weekday, and the rules differ by country. US federal holidays shift to the Friday before if they fall on a Saturday, and the Monday after if they fall on a Sunday. UK bank holidays always move to the next available weekday, so Christmas on a Saturday produces substitute days on the following Monday and Tuesday. Both rules are implemented, so the count is correct in those years rather than one or two days out.
- How is the Easter date calculated?
- With the anonymous Gregorian algorithm, which computes Easter Sunday from the year alone. Good Friday and Easter Monday follow from it. That means UK holidays are correct for any year you enter, past or future, rather than only for years someone remembered to hardcode.
- Do time zones or daylight saving affect the result?
- No. All date arithmetic is done in UTC, so a clock change never adds or removes a day. This is a real bug in many date calculators: computing across a daylight saving boundary in local time can silently produce a 23-hour or 25-hour day and shift the count. Dates here are treated as calendar dates, not instants.
Exact for weekends, and holidays are computed from the official rules for the region you pick, including substitute days. Regional and company holidays are not included.