Rat Gestation Chart and Table
Every fifth breeding date across the year with the matching birthing date, calculated at 22 days. The normal range is 21 to 23 days, so treat each due date as the middle of a window. The page is formatted to print cleanly for a barn wall.
Rat gestation table: breeding to birthing dates
| Breeding date | Expected birthing date (22 days) |
|---|---|
| 1 Jan 2026 | 23 Jan 2026 |
| 6 Jan 2026 | 28 Jan 2026 |
| 11 Jan 2026 | 2 Feb 2026 |
| 16 Jan 2026 | 7 Feb 2026 |
| 21 Jan 2026 | 12 Feb 2026 |
| 26 Jan 2026 | 17 Feb 2026 |
| 31 Jan 2026 | 22 Feb 2026 |
| 5 Feb 2026 | 27 Feb 2026 |
| 10 Feb 2026 | 4 Mar 2026 |
| 15 Feb 2026 | 9 Mar 2026 |
| 20 Feb 2026 | 14 Mar 2026 |
| 25 Feb 2026 | 19 Mar 2026 |
| 2 Mar 2026 | 24 Mar 2026 |
| 7 Mar 2026 | 29 Mar 2026 |
| 12 Mar 2026 | 3 Apr 2026 |
| 17 Mar 2026 | 8 Apr 2026 |
| 22 Mar 2026 | 13 Apr 2026 |
| 27 Mar 2026 | 18 Apr 2026 |
| 1 Apr 2026 | 23 Apr 2026 |
| 6 Apr 2026 | 28 Apr 2026 |
| 11 Apr 2026 | 3 May 2026 |
| 16 Apr 2026 | 8 May 2026 |
| 21 Apr 2026 | 13 May 2026 |
| 26 Apr 2026 | 18 May 2026 |
| 1 May 2026 | 23 May 2026 |
| 6 May 2026 | 28 May 2026 |
| 11 May 2026 | 2 Jun 2026 |
| 16 May 2026 | 7 Jun 2026 |
| 21 May 2026 | 12 Jun 2026 |
| 26 May 2026 | 17 Jun 2026 |
| 31 May 2026 | 22 Jun 2026 |
| 5 Jun 2026 | 27 Jun 2026 |
| 10 Jun 2026 | 2 Jul 2026 |
| 15 Jun 2026 | 7 Jul 2026 |
| 20 Jun 2026 | 12 Jul 2026 |
| 25 Jun 2026 | 17 Jul 2026 |
| 30 Jun 2026 | 22 Jul 2026 |
| 5 Jul 2026 | 27 Jul 2026 |
| 10 Jul 2026 | 1 Aug 2026 |
| 15 Jul 2026 | 6 Aug 2026 |
| 20 Jul 2026 | 11 Aug 2026 |
| 25 Jul 2026 | 16 Aug 2026 |
| 30 Jul 2026 | 21 Aug 2026 |
| 4 Aug 2026 | 26 Aug 2026 |
| 9 Aug 2026 | 31 Aug 2026 |
| 14 Aug 2026 | 5 Sept 2026 |
| 19 Aug 2026 | 10 Sept 2026 |
| 24 Aug 2026 | 15 Sept 2026 |
| 29 Aug 2026 | 20 Sept 2026 |
| 3 Sept 2026 | 25 Sept 2026 |
| 8 Sept 2026 | 30 Sept 2026 |
| 13 Sept 2026 | 5 Oct 2026 |
| 18 Sept 2026 | 10 Oct 2026 |
| 23 Sept 2026 | 15 Oct 2026 |
| 28 Sept 2026 | 20 Oct 2026 |
| 3 Oct 2026 | 25 Oct 2026 |
| 8 Oct 2026 | 30 Oct 2026 |
| 13 Oct 2026 | 4 Nov 2026 |
| 18 Oct 2026 | 9 Nov 2026 |
| 23 Oct 2026 | 14 Nov 2026 |
| 28 Oct 2026 | 19 Nov 2026 |
| 2 Nov 2026 | 24 Nov 2026 |
| 7 Nov 2026 | 29 Nov 2026 |
| 12 Nov 2026 | 4 Dec 2026 |
| 17 Nov 2026 | 9 Dec 2026 |
| 22 Nov 2026 | 14 Dec 2026 |
| 27 Nov 2026 | 19 Dec 2026 |
| 2 Dec 2026 | 24 Dec 2026 |
| 7 Dec 2026 | 29 Dec 2026 |
| 12 Dec 2026 | 3 Jan 2027 |
| 17 Dec 2026 | 8 Jan 2027 |
| 22 Dec 2026 | 13 Jan 2027 |
| 27 Dec 2026 | 18 Jan 2027 |
How to read the rat gestation chart
Find the row closest to the date the rat was served. The right-hand column is the expected birthing date at 22 days. Because normal gestation spans 21 to 23 days, plan for a window of a few days either side of that date. For a date that is not on the grid, use the calculator below.
Look up an exact rat due date
Estimated birthing date
Monday, 24 August 2026
Earliest
23 Aug 2026
Latest
25 Aug 2026
Printable rat gestation calendar
The table above is formatted for paper: navigation, buttons and adverts are hidden when printed, so it comes out as a clean one-page calendar for the barn wall or breeding record.