HerdFlo: Gestation Calculator

HerdFlo is the fast, accurate gestation calculator and herd record keeper built for ranchers, smallholders, and breeders. Enter a breeding date and instantly get the expected due date, plus a milestone timeline you can plan around.

ACCURATE DUE DATES FOR YOUR HERD Covers 28 species and 61+ breed-specific gestation lengths — cattle, goats, sheep, pigs, horses, donkeys, llamas, alpacas, rabbits, dogs, and many more. Pick the species and breed and HerdFlo does the math for you. Works fully offline, so it keeps working in the barn, the pasture, or anywhere with no signal.

PLAN FORWARD OR BACKWARD Forward planning: enter the breeding date, get the due date. Reverse planning: pick the date you want animals to deliver and HerdFlo tells you when to breed. Great for lining up calving and kidding with weather, labor, and market timing.

MILESTONE TIMELINE Each due date comes with a milestone timeline highlighting key checkpoints across the pregnancy so you know what to watch for and when. Always confirm health decisions with your veterinarian — HerdFlo organizes the schedule, your vet provides the care.

EXPORT TO YOUR CALENDAR Export any due date and its milestones to your calendar with .ics export, so reminders show up alongside the rest of your schedule.

HERD RECORDS THAT STAY ORGANIZED Keep full records for every animal:

• Breeding to calving/kidding events, with birth weight and calving ease
• Weight tracking over time
• Treatments and medications, with withdrawal-date tracking
• Pasture and pen moves
• Photos for each animal
• Calving-interval analytics to spot your most productive females
• CSV import and export so your data is always yours

BUILT FOR THE FIELD

• Works offline; no account required to use the calculator
• Clean, fast, and simple to use with gloves on
• Free for up to 5 animals
• Optional records keeping for larger herds

Whether you run a few backyard goats or a working cattle operation, HerdFlo keeps your breeding calendar and herd records in one organized place. Download HerdFlo and never guess a due date again.

HERDFLO PRO (optional subscription) The free plan stores up to 5 animals. HerdFlo Pro removes the limit for $5.99/month or $39.99/year — an auto-renewing subscription billed to your Apple ID, cancellable anytime in your App Store subscription settings. Terms of Use: https://herd.farmsflo.com/terms.html Privacy Policy: https://herd.farmsflo.com/privacy.html