Calculate a date
Formula used
Calendar date = Starting date ± (Weeks × 7 calendar days)
16 weeks = 16 × 7 = 112 calendar days
Business date = Starting date ± (Weeks × 5 counted workdays)
Skipped dates = Selected weekend days + Entered holidaysHow to use this calculator
- Select today or enter another starting date.
- Enter sixteen weeks or choose another amount.
- Choose forward or backward date calculation.
- Select calendar weeks or business weeks.
- Choose weekends and enter optional holiday dates.
- Calculate, copy, print, or download your result.
Example date calculations
| Starting date | Weeks | Direction | Calendar result |
|---|---|---|---|
| Jul 23, 2026 | 8 | Forward | Thu, Sep 17, 2026 |
| Jul 23, 2026 | 12 | Forward | Thu, Oct 15, 2026 |
| Jul 23, 2026 | 16 | Forward | Thu, Nov 12, 2026 |
| Jul 23, 2026 | 20 | Forward | Thu, Dec 10, 2026 |
| Jul 23, 2026 | 24 | Forward | Thu, Jan 7, 2027 |
| Jul 23, 2026 | 16 | Backward | Thu, Apr 2, 2026 |
Calendar weeks and business weeks
Calendar weeks always contain seven consecutive calendar days. Business weeks usually contain five counted working days. Weekend and holiday settings can change the business result.
This tool provides both results for easy comparison. Custom weekends support different regional working schedules. Enter official holidays manually for accurate local planning results.
Frequently asked questions
What date is sixteen weeks from today?
The answer depends on today’s actual calendar date. This calculator detects today automatically. It then adds exactly one hundred twelve calendar days.
How many days are in sixteen weeks?
Sixteen weeks contain exactly one hundred twelve calendar days. The formula multiplies sixteen by seven. Business-week calculations use eighty counted working days instead.
Can I calculate from another starting date?
Yes, choose any valid date using the date picker. Past and future dates are supported. The calculator preserves your submitted date after calculation.
Can the calculator subtract sixteen weeks?
Yes, select the backward direction before calculating. The tool subtracts the chosen interval. Both calendar and business comparisons remain available afterward.
What is a business week?
A business week contains five counted working days here. Selected weekends and holidays are skipped. Regional work schedules can be customized with checkboxes.
Are public holidays included automatically?
No, holiday calendars differ across countries and organizations. Enter relevant dates using ISO format. Those dates are skipped during business calculations only.
Can I choose different weekend days?
Yes, every weekday has an available checkbox. Select any nonworking days for exclusion. Keep at least one working weekday available.
Does the tool support decimal weeks?
Yes, decimal week values are accepted. Converted day totals are rounded. This keeps every result on a complete calendar date.
What does the ISO date mean?
ISO dates use the year-month-day format. This structure avoids regional date ambiguity. It is useful for databases and technical systems.
Can I download the calculation?
Yes, results can be downloaded as CSV or PDF. A print button is included. The copy button creates a shareable text summary.
Is this suitable for pregnancy planning?
The calculator can support general date planning. It does not provide medical advice. Confirm clinical dates with a qualified healthcare professional.