Quick answer
Business days usually mean Monday to Friday and normally exclude weekends. Calendar days count every day on the calendar, including Saturdays, Sundays and public holidays. If a deadline says 10 calendar days, count every day. If it says 10 business days, skip weekends and check whether bank holidays are excluded.
Key takeaways
- Calendar days include weekends.
- Business days usually exclude weekends.
- Always check whether holidays and the start date are included.
Calendar days count every day
Calendar days include every date on the calendar: weekdays, weekends, and public holidays. If something takes 7 calendar days from Monday, you count Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday, and Monday.
Business days usually count working weekdays
Business days normally mean Monday to Friday, excluding weekends. In many situations, public holidays are also excluded because offices, banks, or support teams may be closed.
Why it matters
The difference can be significant. Ten calendar days is always ten days. Ten business days can stretch across two full weeks, and longer if public holidays are involved.
- Shipping estimates often use business days
- Customer service SLAs may use business days
- Finance and banking processes often use business days
- Regulated complaint deadlines may use working days or calendar days depending on the rule
Business days vs calendar days comparison
| Term | What it usually counts | Simple example |
|---|---|---|
| Calendar days | Every day, including weekends and holidays. | 5 calendar days from Monday reaches Saturday if the start day is not counted. |
| Business days | Working weekdays, usually Monday to Friday. | 5 business days from Monday usually reaches the following Monday if the start day is not counted. |
| Working days | Often the same as business days, but always check the policy wording. | A customer service SLA may pause at weekends and public holidays. |
Does calendar days include weekends?
Yes. Calendar days include weekends. If wording says calendar days, count Saturdays and Sundays unless the contract, policy or law says otherwise.
When should you use business days?
Use business days for workplace deadlines, banking, customer support response times, delivery estimates and processes that only move during normal working weekdays.
Related calculators
- Business Day Calculator - calculate working days between two dates.
- 5 business days from today - answer a common deadline question quickly.
- Next business day calculator - find the next working day.
Useful official resources
These sources are directly relevant to the date, public holiday, delivery, SLA, or complaint-handling topic covered in this article.
Related video searches
If you prefer a video explanation, these searches can help you find relevant explainers on YouTube.
Use bizdaycalc to compare date ranges without counting by hand.
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