Business Days Calculator
Free online business days calculator to count working days between two dates or add business days to a date. Get accurate results with charts for project planning and deadlines.
About This Calculator
The Business Days Calculator is a free online tool that counts the number of working days between any two dates or calculates the resulting date after adding a specific number of business days. Whether you are planning a project timeline, estimating invoice payment dates, tracking contract deadlines, or scheduling deliveries, this calculator gives you accurate business day counts by automatically excluding weekends (Saturday and Sunday).
How It Works
In Count Business Days mode, enter a start date and end date. The calculator iterates through each day in the range, counting weekdays (Monday-Friday) as business days and weekends (Saturday-Sunday) separately. It uses the date-fns library for precise date arithmetic. Results include total business days, weekend days, calendar days, the number of weeks, and the average business days per week. In Add Business Days mode, enter a start date and the number of business days to add. The calculator moves forward day by day, skipping weekends, to find the exact end date. For example, adding 10 business days to a Monday results in the Monday two weeks later.
Features
- Two calculation modes: Count business days between dates or add business days to a date
- Business Days Count: Total weekday count excluding weekends
- Calendar Days: Total days in the range including weekends
- Weekend Days: Number of Saturdays and Sundays in the range
- Weeks and Averages: Total weeks and average business days per week
- Comparison Chart: Bar chart comparing business days, weekend days, and calendar days
- Overview Chart: Pie chart showing the breakdown of business vs weekend days
- Shareable URLs: Your dates and mode are saved in the URL for bookmarking and sharing
Regional Notes
This calculator uses the global standard of Monday-Friday as business days. In India, many organizations follow a Monday-Friday or Monday-Saturday workweek — this calculator uses the 5-day model. Government offices in India observe a 5-day week with Saturday and Sunday off. In the United States, the standard business week is Monday-Friday, with federal holidays like New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas observed as paid holidays. In the United Kingdom, Monday-Friday is the standard with 8 bank holidays in England and Wales (10 in Scotland). Public holidays are not automatically excluded — subtract them from your business day total for exact results specific to your region.
Common Use Cases
Use this calculator to determine invoice payment terms (net 30, net 60 business days), estimate shipping and delivery dates, calculate project milestone deadlines in working days, plan contract and legal timelines, count school or university term working days, and schedule payroll processing cycles. The Add Business Days mode is particularly useful for estimating when a task will be completed if you know the number of working days required.
Frequently Asked Questions
How does the Business Days Calculator work?
The Business Days Calculator offers two modes. In Count mode, enter a start date and an end date to see the total business days (Monday-Friday), weekend days, calendar days, and weeks between them. In Add mode, enter a start date and a number of business days to find the exact end date after adding only working days, automatically skipping weekends.
Is the Business Days Calculator free to use?
Yes, all calculators on Calculy are completely free to use with no registration or hidden fees. You can calculate business days as many times as needed and bookmark URLs with your dates pre-filled for quick access.
What counts as a business day?
In this calculator, business days are Monday through Friday, excluding weekends (Saturday and Sunday). This matches the standard 5-day workweek used in most corporate, government, and financial settings across India, the US, the UK, and many other countries. Public holidays are not automatically excluded — you should subtract them from the total for precise results.
How many business days are in a year?
On average, there are 260 to 262 business days per year in a standard 5-day workweek, depending on leap years. In 2025, there are 261 business days. In India, after accounting for national holidays like Republic Day (Jan 26), Independence Day (Aug 15), and Gandhi Jayanti (Oct 2), the effective working days drop to approximately 250-255 per year. In the US, federal holidays reduce it by 11 days, giving roughly 250 business days. In the UK, bank holidays (8 in England, 10 in Scotland) further reduce the count.
How many business days are in a month?
A typical month has 20 to 23 business days, depending on the number of days in the month and which day it starts on. For example, January 2025 has 23 business days (31 days starting on Wednesday), while February 2025 (non-leap year) has 20 business days (28 days starting on Saturday). The average is roughly 21-22 business days per month across the year.
Does the calculator handle public holidays?
The calculator excludes weekends (Saturday and Sunday) but does not automatically exclude public holidays, since holidays vary by country, state, and organization. For precise business day counts excluding holidays, use the calculator to get the base count and manually subtract the number of public holidays that fall on weekdays within your date range.
Can I calculate a date after adding or subtracting business days?
Yes, switch to the Add Business Days mode. Enter your start date and the number of business days to add, and the calculator will find the resulting end date while skipping weekends. For example, adding 10 business days to a Monday gives you the date two weeks later on a Monday. This is useful for estimating delivery dates, invoice due dates, and project deadlines.
What is the difference between business days and calendar days?
Calendar days include every day of the week (including Saturdays and Sundays). Business days only include weekdays (Monday through Friday), which are the days most businesses operate. For example, 7 calendar days typically contain 5 business days and 2 weekend days. When calculating delivery times, payment terms, or project deadlines, always check whether the duration is specified in business days or calendar days.