Mare Gestation Calculator

Track your mare's pregnancy timeline with our accurate gestation calculator and foaling predictor

Breeding Information

Last Breeding Date:

Breeding Method:

Mare Information

Mare's Name (optional):

Mare's Age:

Foaling History:

Gestation Results

Current Gestation Days

Average Gestation

340 days

Expected Foaling Date
--

Enter breeding date to see foaling probability timeline.

Pregnancy Timeline

Your mare's detailed pregnancy timeline will appear here.

🐴 Key Pregnancy Milestones

Stage	Days Pregnant	Developmental Milestone
Early Embryo	0-14	Fertilization and embryo migration
Implantation	14-35	Embryo attaches to uterine wall
Organ Formation	35-60	Major organs begin developing
Sex Determination	~60	Fetal sex can be determined
Rapid Growth	120-240	Foal grows from 2cm to ~50cm
Final Trimester	240-340	90% of foal growth occurs
Udder Development	300+	Mare's udder begins filling

Note: Gestation typically ranges from 320-365 days, with 340 days being average.

🚨 Foaling Signs to Watch For

1-4

Weeks Before

Udder begins developing, belly drops, vulva relaxes

24-48

Hours Before

Waxing of teats, restlessness, sweating

2-6

Hours Before

Milk calcium levels rise (testable with strips)

1-2

Hours Before

Visible contractions, frequent lying down/up

⏳

Active Labor

Water breaks, strong contractions, foal presentation

❗

Emergency Signs

Prolonged labor (>30 min straining), abnormal presentation

✅ Foaling Preparation Checklist

Clean, well-bedded foaling stall (12x12 ft minimum)

Foaling kit prepared (towels, iodine, gloves, etc.)

Vet emergency contact programmed

Mare vaccinated 4-6 weeks pre-foaling

Mare dewormed 30 days pre-foaling

Foaling camera or monitoring system set up

Colostrum quality tested or backup available

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Note: This calculator provides estimates based on average gestation periods (340 days). Individual mares may foal anywhere from 320-365 days. Always consult with your veterinarian for pregnancy monitoring and foaling preparation.