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Calcimator

Gestation Calendar

Calculate the expected due date for livestock from the breeding date. Supports cattle, horses, sheep, goats, and pigs with trimester milestones.

Inputs

Results

Expected Due Date

January 8

Gestation Length283 days
Breeding DateMarch 31
1st Trimester EndsJuly 3
2nd Trimester EndsOctober 6
SpeciesCattle
How to Use This Calculator
  1. Enter the breeding date or first service date.
  2. Select the species (bovine, equine, porcine, ovine, caprine) to apply the correct gestation length.
  3. Review the expected parturition date range based on average and range of gestation.
  4. Set a close-up observation period (10-14 days before due date) to schedule increased checks.
  5. Record actual calving/foaling/farrowing date to improve future prediction accuracy.

What each input means

Species
1 = Cattle (283 days), 2 = Horse (340 days), 3 = Sheep (150 days), 4 = Goat (150 days), 5 = Pig (114 days).
Breeding Day of Year
Day of the year the animal was bred (1 = Jan 1, 90 ≈ April 1, 180 ≈ June 29, 365 = Dec 31).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Species = 1, Breeding Day of Year = 90 = 2 input(s) provided
  2. Calculate Expected Due Date
    Expected Due Date
    January 8 = January 8
  3. Calculate Gestation Length
    283 = 283
  4. Calculate Breeding Date
    Breeding Date
    March 31 = March 31

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