Pregnancy Due Date worksheet

1. Estimated due date: Friday, Aug 28, 2026

1. A 3-day embryo was conceived 3 days before the transfer. So take 3 days off the usual 266 days from conception

   $266-3$$=263\text{\hspace{0.17em}days}$

2. Count that many days on from the transfer date

   $\text{Dec 8, 2025}\text{+}263\text{\hspace{0.17em}days}$$=\text{Friday, Aug 28, 2026}$

3. Count the days since the pregnancy's starting point, 280 days before the due date. In a 28-day cycle, that's the first day of the last period

   $\text{Feb 4, 2027}\text{−}\text{Nov 21, 2025}$$=440\text{\hspace{0.17em}days}$

4. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $440\text{÷ 7}$$=\text{62 weeks, 6 days}$

5. Find the trimester: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, and the third after that

   $\text{Third trimester}$

6. Find how far along you are, as a share of the full 280 days

   $\text{(}440\text{÷ 280) × 100}$$=\mathrm{157.1\%}$

2. Estimated due date: Tuesday, Jan 27, 2026

1. At the scan the pregnancy measured 9 weeks 0 days. Take that from 280 to find the days still to go

   $280-\left(9\text{× 7}+0\right)$$=217\text{\hspace{0.17em}days}$

2. Count that many days on from the scan date

   $\text{Jun 24, 2025}\text{+}217\text{\hspace{0.17em}days}$$=\text{Tuesday, Jan 27, 2026}$

3. Count the days since the pregnancy's starting point, 280 days before the due date. In a 28-day cycle, that's the first day of the last period

   $\text{Jan 6, 2026}\text{−}\text{Apr 22, 2025}$$=259\text{\hspace{0.17em}days}$

4. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $259\text{÷ 7}$$=\text{37 weeks, 0 days}$

5. Find the trimester: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, and the third after that

   $\text{Third trimester}$

6. Find how far along you are, as a share of the full 280 days

   $\text{(}259\text{÷ 280) × 100}$$=\mathrm{92.5\%}$

3. Estimated due date: Friday, May 8, 2026

1. A pregnancy is counted as 280 days from your last period. Add or take away days if your cycle is longer or shorter than 28 days

   $280+\left(22-28\right)$$=274\text{\hspace{0.17em}days}$

2. Count that many days on from the first day of your last period

   $\text{Aug 7, 2025}\text{+}274\text{\hspace{0.17em}days}$$=\text{Friday, May 8, 2026}$

3. Count the days since the pregnancy's starting point, 280 days before the due date. In a 28-day cycle, that's the first day of the last period

   $\text{Oct 23, 2025}\text{−}\text{Aug 1, 2025}$$=83\text{\hspace{0.17em}days}$

4. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $83\text{÷ 7}$$=\text{11 weeks, 6 days}$

5. Find the trimester: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, and the third after that

   $\text{First trimester}$

6. Find how far along you are, as a share of the full 280 days

   $\text{(}83\text{÷ 280) × 100}$$=\mathrm{29.6\%}$

4. Estimated due date: Saturday, Feb 21, 2026

1. At the scan the pregnancy measured 6 weeks 0 days. Take that from 280 to find the days still to go

   $280-\left(6\text{× 7}+0\right)$$=238\text{\hspace{0.17em}days}$

2. Count that many days on from the scan date

   $\text{Jun 28, 2025}\text{+}238\text{\hspace{0.17em}days}$$=\text{Saturday, Feb 21, 2026}$

3. Count the days since the pregnancy's starting point, 280 days before the due date. In a 28-day cycle, that's the first day of the last period

   $\text{Aug 4, 2025}\text{−}\text{May 17, 2025}$$=79\text{\hspace{0.17em}days}$

4. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $79\text{÷ 7}$$=\text{11 weeks, 2 days}$

5. Find the trimester: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, and the third after that

   $\text{First trimester}$

6. Find how far along you are, as a share of the full 280 days

   $\text{(}79\text{÷ 280) × 100}$$=\mathrm{28.2\%}$

5. Estimated due date: Friday, Dec 4, 2026

1. A pregnancy is counted as 280 days from your last period. Add or take away days if your cycle is longer or shorter than 28 days

   $280+\left(28-28\right)$$=280\text{\hspace{0.17em}days}$

2. Count that many days on from the first day of your last period

   $\text{Feb 27, 2026}\text{+}280\text{\hspace{0.17em}days}$$=\text{Friday, Dec 4, 2026}$

3. The date you chose comes before the pregnancy's starting point (280 days before the due date), so there's no pregnancy age yet

   $\text{Dec 9, 2025}\text{−}\text{Feb 27, 2026}$$=\mathrm{-80}\text{\hspace{0.17em}days}$

6. Estimated due date: Saturday, Sep 4, 2027

1. At the scan the pregnancy measured 7 weeks 0 days. Take that from 280 to find the days still to go

   $280-\left(7\text{× 7}+0\right)$$=231\text{\hspace{0.17em}days}$

2. Count that many days on from the scan date

   $\text{Jan 16, 2027}\text{+}231\text{\hspace{0.17em}days}$$=\text{Saturday, Sep 4, 2027}$

3. The date you chose comes before the pregnancy's starting point (280 days before the due date), so there's no pregnancy age yet

   $\text{Jun 28, 2025}\text{−}\text{Nov 28, 2026}$$=\mathrm{-518}\text{\hspace{0.17em}days}$

7. Estimated due date: Friday, Jan 22, 2027

1. A pregnancy is counted as 280 days from your last period. Add or take away days if your cycle is longer or shorter than 28 days

   $280+\left(23-28\right)$$=275\text{\hspace{0.17em}days}$

2. Count that many days on from the first day of your last period

   $\text{Apr 22, 2026}\text{+}275\text{\hspace{0.17em}days}$$=\text{Friday, Jan 22, 2027}$

3. Count the days since the pregnancy's starting point, 280 days before the due date. In a 28-day cycle, that's the first day of the last period

   $\text{Apr 23, 2026}\text{−}\text{Apr 17, 2026}$$=6\text{\hspace{0.17em}days}$

4. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $6\text{÷ 7}$$=\text{0 weeks, 6 days}$

5. Find the trimester: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, and the third after that

   $\text{First trimester}$

6. Find how far along you are, as a share of the full 280 days

   $\text{(}6\text{÷ 280) × 100}$$=\mathrm{2.1\%}$

8. Estimated due date: Wednesday, Dec 17, 2025

1. At the scan the pregnancy measured 10 weeks 0 days. Take that from 280 to find the days still to go

   $280-\left(10\text{× 7}+0\right)$$=210\text{\hspace{0.17em}days}$

2. Count that many days on from the scan date

   $\text{May 21, 2025}\text{+}210\text{\hspace{0.17em}days}$$=\text{Wednesday, Dec 17, 2025}$

3. Count the days since the pregnancy's starting point, 280 days before the due date. In a 28-day cycle, that's the first day of the last period

   $\text{Jan 12, 2027}\text{−}\text{Mar 12, 2025}$$=671\text{\hspace{0.17em}days}$

4. Split the days into whole weeks and leftover days, since pregnancy is counted in weeks

   $671\text{÷ 7}$$=\text{95 weeks, 6 days}$

5. Find the trimester: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, and the third after that

   $\text{Third trimester}$

6. Find how far along you are, as a share of the full 280 days

   $\text{(}671\text{÷ 280) × 100}$$=\mathrm{239.6\%}$

9. Estimated due date: Saturday, Nov 28, 2026

1. At the scan the pregnancy measured 12 weeks 3 days. Take that from 280 to find the days still to go

   $280-\left(12\text{× 7}+3\right)$$=193\text{\hspace{0.17em}days}$

2. Count that many days on from the scan date

   $\text{May 19, 2026}\text{+}193\text{\hspace{0.17em}days}$$=\text{Saturday, Nov 28, 2026}$

3. The date you chose comes before the pregnancy's starting point (280 days before the due date), so there's no pregnancy age yet

   $\text{Aug 4, 2025}\text{−}\text{Feb 21, 2026}$$=\mathrm{-201}\text{\hspace{0.17em}days}$

10. Estimated due date: Wednesday, Jul 29, 2026

1. At the scan the pregnancy measured 9 weeks 0 days. Take that from 280 to find the days still to go

   $280-\left(9\text{× 7}+0\right)$$=217\text{\hspace{0.17em}days}$

2. Count that many days on from the scan date

   $\text{Dec 24, 2025}\text{+}217\text{\hspace{0.17em}days}$$=\text{Wednesday, Jul 29, 2026}$

3. The date you chose comes before the pregnancy's starting point (280 days before the due date), so there's no pregnancy age yet

   $\text{Mar 27, 2025}\text{−}\text{Oct 22, 2025}$$=\mathrm{-209}\text{\hspace{0.17em}days}$