Biology
Swine Gestation Calculator
Track a sow's pregnancy: enter the days since breeding to see how far along she is, how many days remain, and the expected farrowing window.
Your inputs
Change any value to update the result instantly.
Days until expected farrowing
57 days
Pregnancy completed
50 %
Days elapsed
57 days
Stage
Second third of pregnancy
Normal range for this species
112–116 days (typical average 114)
Earliest expected day
112 days
Latest expected day
116 days
Pig gestation is famously “three months, three weeks and three days” — about 114 days. Educational estimate only — confirm pregnancy and timing with a veterinarian; this tool is not veterinary advice.
What this calculator does
Projects a farrowing window for a sow from the breeding date.
What your result means
Days remaining to expected farrowing, based on the 114-day average.
Formula and working
days remaining = gestation length − days elapsed; progress = days elapsed ÷ gestation length × 100
- 1
Collect the inputs
Days since breeding = 57 days; Gestation length used = 114 days
- 2
Apply the formula
days remaining = gestation length − days elapsed; progress = days elapsed ÷ gestation length × 100
- 3
Result
Days until expected farrowing = 57 days
Frequently asked questions
Symbols and assumptions
- L
- Gestation length in days
- d
- Days elapsed since breeding
- • Approximately 114 days — the traditional three months, three weeks and three days.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Parity and litter size cause small shifts. Not veterinary advice.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Report a mistake or request an improvement
Tell us if a formula, unit, explanation, or result needs attention. Your message will include this calculator’s name and page.
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