280 Days From Today
280 days (40 weeks) from today is:
280 Days = 40 Weeks = Full-Term Pregnancy
280 days from the first day of the last menstrual period (LMP) is the standard estimated due date for a pregnancy. This equals exactly 40 weeks or approximately 9 months and 1 week.
Pregnancy Timeline by Days
| Days | Weeks | Trimester | Milestone |
|---|---|---|---|
| 0–84 | 0–12 | First | Organ formation, first ultrasound |
| 85–182 | 12–26 | Second | Gender visible, movements felt |
| 183–280 | 26–40 | Third | Growth, positioning, birth preparation |
| 259 | 37 | Third | Officially "early term" |
| 273 | 39 | Third | "Full term" begins |
| 280 | 40 | Third | Estimated due date (EDD) |
| 294 | 42 | Third | Post-term — induction typically discussed |
Key Pregnancy Dates from Today
If today is the first day of your last menstrual period:
- First trimester ends in approximately 84 days (12 weeks)
- Mid-pregnancy ultrasound at approximately 140 days (20 weeks)
- Third trimester begins at approximately 183 days (26 weeks)
- Full term at approximately 273 days (39 weeks)
- Due date at approximately 280 days (40 weeks)
Important Notes
This calculator uses the standard Naegele's rule (LMP + 280 days). Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks either side. Consult your GP, midwife, or obstetrician for a personalised estimate based on ultrasound measurements.
Full Pregnancy Due Date Calculator
Enter your LMP date for a personalised due date with trimester milestones.
Pregnancy CalculatorFrequently Asked Questions
Why is pregnancy 280 days?
Pregnancy is counted as 280 days (40 weeks) from the first day of the last menstrual period (LMP). This is based on Naegele's rule, developed in the early 1800s. The actual time from conception to birth is approximately 266 days (38 weeks).
How accurate is the 280-day due date?
Only about 5% of babies arrive on the exact due date. About 80% of babies are born between 37 and 42 weeks. The due date is an estimate, not a precise prediction.
What date is 280 days from today?
Use the calculator at the top of this page to see the exact date 280 days (40 weeks) from today.
Is 280 days from my LMP or from conception?
280 days is counted from the first day of the Last Menstrual Period (LMP), not from conception. From conception, the average pregnancy is about 266 days (38 weeks).