Gestation Calculator — Livestock Due Date by Species

Track breeding dates and predict due dates for all livestock species

Due Date

Fri

Days Left

Progress

40%

Gestation

150 days

Breeding Date

Expected Due Date

Fri, Jun 19, 2026

2nd trimester

Day 6040%Day 150

Days Elapsed

Days Remaining

Key Dates

EarliestSun, Jun 14, 2026

ExpectedFri, Jun 19, 2026

LatestWed, Jun 24, 2026

Watch DateSun, Jun 7, 2026

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Example Calculations

1Goat Bred Jan 15

Inputs

SpeciesGoat

Breeding DateJan 15

Result

Due DateJun 14

EarliestJun 9

LatestJun 19

Gestation150 days

Jan 15 + 150 days = Jun 14. Range: Jun 9 (day 145) to Jun 19 (day 155).

2Cow Bred Sep 1

Inputs

SpeciesCattle

Breeding DateSep 1

Result

Due DateJun 11

EarliestJun 7

LatestJun 18

Gestation283 days

Sep 1 + 283 days = Jun 11. Range: Jun 7 (day 279) to Jun 18 (day 290).

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Frequently Asked Questions

How long is a cow pregnant?

Cattle gestation averages 283 days (about 9.5 months), with a normal range of 279–290 days. First-calf heifers tend to calve a few days earlier than mature cows. Breed also affects length — beef breeds average slightly longer than dairy.

Average: 283 days (9.5 months)
Normal range: 279–290 days
First-calf heifers: 2–3 days earlier
Bull calves tend to gestate 1–2 days longer
Twins typically arrive 3–7 days early

Species	Gestation Days	Range	Watch Period
Cattle	283	279–290	14 days before
Goat	150	145–155	7 days before
Sheep	147	142–152	7 days before
Pig	114	111–117	5 days before

How long is a goat pregnant?

Goat gestation is 150 days (about 5 months), ranging from 145 to 155 days. Nigerian Dwarfs tend to be on the shorter end. Watch for signs of labor starting 7 days before the due date.

Average: 150 days (5 months)
Range: 145–155 days
Does carrying multiples may deliver earlier
First-time does: watch for dystocia
Ligament softening starts 12–24 hours before labor

What is the gestation period for pigs?

Pig gestation is famously "3 months, 3 weeks, and 3 days" — 114 days on average. Range is 111–117 days. Sows usually farrow (give birth) at night or early morning. Prepare the farrowing area 5 days before the due date.

Average: 114 days (3 months, 3 weeks, 3 days)
Range: 111–117 days
Average litter size: 10–12 piglets
Set up farrowing pen 1 week before due date
Signs: nesting behavior, milk letdown 12–24 hours before

How long is a horse pregnant?

Horse gestation averages 340 days (about 11 months) but has the widest range of any common livestock — 320 to 365 days. Foals born before 320 days are considered premature. Most mares foal at night.

Average: 340 days (11 months)
Range: 320–365 days (very wide!)
Maiden mares: often shorter gestation
Colts tend to gestate longer than fillies
Watch signs starting 3 weeks before due date

Show all questions

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Last Updated: Mar 20, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.