Rabbit Gestation Calculator

Kindling due date from breeding date, with nest box day.

What it does

Rabbits kindle fast: about 31 days from breeding to birth against 63 for cats and dogs, 150 for goats, and 340 for horses. Litters run 1 to 12 kits on roughly monthly cycles, so dates compound quickly for breeders.

The tool above takes the breeding date and returns the day 31 due date, the 28 to 33 window, and the day 28 nest box date. The default Apr 1 2026 breeding is due Sat May 02 inside Wed Apr 29 to Mon May 04, with the box set Wed Apr 29.

Lengths match extension and breeder society sources: 31 to 32 days average with kindling across 28 to 33, smaller breeds earlier and heavier later. Nest boxes enter on day 28 with soft bedding plus pulled fur.

Fur pulling 1 to 2 days before delivery signals hours left. Prolonged straining, no kits past day 33, or small litters with big kits all call the vet rather than the calendar.

How to use

1. Type the breeding date.
2. Read due date first, window beside it.
3. Set the nest box on day 28.
4. Watch for fur pulling 1 to 2 days out.
5. Count kits against the 1 to 12 norm.
6. Call the vet past day 33 or on straining.

Formula

31

Average rabbit gestation in days.

28 to 33

Normal kindling window.

nest box

Bedded box placed day 28.

Breed size shifts a day or two inside the window. UTC date math keeps DST changes from shifting days.

Worked example

Reference table

Limits

• Averages; individuals kindle across the window.
• Breed size shifts a day or two.
• Date errors move everything with them.
• Vet rules on straining and overdue.

Common mistakes

• Setting the box on due day instead of day 28.
• Missing the breeding date by a heat cycle.
• No fur or bedding ready at day 28.
• Waiting past day 33 without a vet.
• Handling newborns with scented hands.

Try it yourself

Quick checks. Answers sit tucked under each question.

Questions

Sources

• House Rabbit Society: Baby Rabbits
• Penn State Extension: Rabbit Production

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