Inclusive vs exclusive counting
Most date math excludes the end date: Monday to next Monday is 7 days, or exactly 1 week. Inclusive counting adds one day and is useful for event attendance or deadline windows where both start and end dates count.
📆 Date math
Weeks Between Dates Calculator
Calculate weeks between two dates with calendar days, full weeks, leftover days, weekdays, weekends, and inclusive counting options.
Free browser utility: Inputs are processed locally in your browser. Results are practical references, not professional advice.
Calculate weeks between two dates
Formula: days between dates ÷ 7 = decimal weeks. The calculator also shows full weeks, leftover days, business days, and weekend days.
0 weeks
Choose dates to calculate.
Common weeks-between examples
| Date span | Calendar days | Weeks | Typical use |
|---|---|---|---|
| 14 days | 14 | 2 weeks | Trial period, sprint planning |
| 30 days | 30 | 4 weeks + 2 days | Monthly billing estimate |
| 90 days | 90 | 12 weeks + 6 days | Quarter planning |
| 180 days | 180 | 25 weeks + 5 days | Half-year planning |
| 365 days | 365 | 52 weeks + 1 day | Annual planning |
Business-day context
Weeks are simple calendar units. If workdays matter, use the business-day count shown here or open the dedicated business days calculator for more weekday-focused planning.
Related tools
FAQ
How do I calculate weeks between dates?
Count the calendar days between the two dates, then divide by 7. The calculator also gives full weeks and leftover days.
Should I include the end date?
Use exclusive counting for standard date math and inclusive counting when both the first and last day should count.
Are holidays included?
No. This calculator counts weekdays and weekends but does not subtract country-specific holidays.
Source snapshot: GSC gap score 86: weeks between dates calculator; AdSense-safe planning utility. Radar cycle 2026-05-11-1223; formulas and reference ranges reviewed 2026-05-11.