Mouse Gestation Chart and Table
Every fifth breeding date across the year with the matching birthing date, calculated at 20 days. The normal range is 19 to 21 days, so treat each due date as the middle of a window. The page is formatted to print cleanly for a barn wall.
Mouse gestation table: breeding to birthing dates
| Breeding date | Expected birthing date (20 days) |
|---|---|
| 1 Jan 2026 | 21 Jan 2026 |
| 6 Jan 2026 | 26 Jan 2026 |
| 11 Jan 2026 | 31 Jan 2026 |
| 16 Jan 2026 | 5 Feb 2026 |
| 21 Jan 2026 | 10 Feb 2026 |
| 26 Jan 2026 | 15 Feb 2026 |
| 31 Jan 2026 | 20 Feb 2026 |
| 5 Feb 2026 | 25 Feb 2026 |
| 10 Feb 2026 | 2 Mar 2026 |
| 15 Feb 2026 | 7 Mar 2026 |
| 20 Feb 2026 | 12 Mar 2026 |
| 25 Feb 2026 | 17 Mar 2026 |
| 2 Mar 2026 | 22 Mar 2026 |
| 7 Mar 2026 | 27 Mar 2026 |
| 12 Mar 2026 | 1 Apr 2026 |
| 17 Mar 2026 | 6 Apr 2026 |
| 22 Mar 2026 | 11 Apr 2026 |
| 27 Mar 2026 | 16 Apr 2026 |
| 1 Apr 2026 | 21 Apr 2026 |
| 6 Apr 2026 | 26 Apr 2026 |
| 11 Apr 2026 | 1 May 2026 |
| 16 Apr 2026 | 6 May 2026 |
| 21 Apr 2026 | 11 May 2026 |
| 26 Apr 2026 | 16 May 2026 |
| 1 May 2026 | 21 May 2026 |
| 6 May 2026 | 26 May 2026 |
| 11 May 2026 | 31 May 2026 |
| 16 May 2026 | 5 Jun 2026 |
| 21 May 2026 | 10 Jun 2026 |
| 26 May 2026 | 15 Jun 2026 |
| 31 May 2026 | 20 Jun 2026 |
| 5 Jun 2026 | 25 Jun 2026 |
| 10 Jun 2026 | 30 Jun 2026 |
| 15 Jun 2026 | 5 Jul 2026 |
| 20 Jun 2026 | 10 Jul 2026 |
| 25 Jun 2026 | 15 Jul 2026 |
| 30 Jun 2026 | 20 Jul 2026 |
| 5 Jul 2026 | 25 Jul 2026 |
| 10 Jul 2026 | 30 Jul 2026 |
| 15 Jul 2026 | 4 Aug 2026 |
| 20 Jul 2026 | 9 Aug 2026 |
| 25 Jul 2026 | 14 Aug 2026 |
| 30 Jul 2026 | 19 Aug 2026 |
| 4 Aug 2026 | 24 Aug 2026 |
| 9 Aug 2026 | 29 Aug 2026 |
| 14 Aug 2026 | 3 Sept 2026 |
| 19 Aug 2026 | 8 Sept 2026 |
| 24 Aug 2026 | 13 Sept 2026 |
| 29 Aug 2026 | 18 Sept 2026 |
| 3 Sept 2026 | 23 Sept 2026 |
| 8 Sept 2026 | 28 Sept 2026 |
| 13 Sept 2026 | 3 Oct 2026 |
| 18 Sept 2026 | 8 Oct 2026 |
| 23 Sept 2026 | 13 Oct 2026 |
| 28 Sept 2026 | 18 Oct 2026 |
| 3 Oct 2026 | 23 Oct 2026 |
| 8 Oct 2026 | 28 Oct 2026 |
| 13 Oct 2026 | 2 Nov 2026 |
| 18 Oct 2026 | 7 Nov 2026 |
| 23 Oct 2026 | 12 Nov 2026 |
| 28 Oct 2026 | 17 Nov 2026 |
| 2 Nov 2026 | 22 Nov 2026 |
| 7 Nov 2026 | 27 Nov 2026 |
| 12 Nov 2026 | 2 Dec 2026 |
| 17 Nov 2026 | 7 Dec 2026 |
| 22 Nov 2026 | 12 Dec 2026 |
| 27 Nov 2026 | 17 Dec 2026 |
| 2 Dec 2026 | 22 Dec 2026 |
| 7 Dec 2026 | 27 Dec 2026 |
| 12 Dec 2026 | 1 Jan 2027 |
| 17 Dec 2026 | 6 Jan 2027 |
| 22 Dec 2026 | 11 Jan 2027 |
| 27 Dec 2026 | 16 Jan 2027 |
How to read the mouse gestation chart
Find the row closest to the date the mouse was served. The right-hand column is the expected birthing date at 20 days. Because normal gestation spans 19 to 21 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 mouse due date
Estimated birthing date
Saturday, 22 August 2026
Earliest
21 Aug 2026
Latest
23 Aug 2026
Printable mouse 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.