Category
Animal Care & Farm
Animal gestation, livestock planning, and practical pet and farm calculators with clear assumptions.
Estimate animal gestation dates and ages, track measured dog and cat weights, estimate horse and cattle weight from body measurements, and plan livestock records with browser-based tools that make their assumptions clear. Each calculator is designed for planning and record keeping, not diagnosis, treatment, or veterinary dosing.
18 tools · Private · Browser-only
Featured calculators
Popular starting points for animal care & farm homework and quick checks.
Dog Pregnancy Calculator
Estimated canine due date.
OpenCat Pregnancy Calculator
Estimated feline due date.
OpenCow Gestation Calculator
Estimated calving date.
OpenHorse Weight Calculator
Estimate adult horse body weight from measurements.
OpenCattle Per Acre Calculator
Estimate herd capacity from available forage.
OpenFeed Conversion Ratio Calculator
Feed used per unit of weight gained.
OpenRecently added & popular
Guides & comparisons
Animal Pregnancy and Gestational Age: Using Calendar Estimates Responsibly
A breeding date can support a useful gestational-age and due-date estimate, but it cannot confirm pregnancy or predict an exact birth date.
Animal Weight Estimates and Tracking: What a Calculator Can—and Cannot—Tell You
Use girth-and-length formulas for planning estimates in horses and cattle; use actual scale weights to track dogs and cats.
Animal Gestation Periods: Estimating Due Dates Responsibly
A breeding date plus a typical species gestation length gives a useful planning estimate, but it cannot predict an exact birth date or replace veterinary assessment.
Animal Breeding Records: How to Track Dates for a Better Gestation Estimate
The calculator only needs a date and species, but a simple breeding record makes that estimate more meaningful and gives your veterinarian better context.
Pregnancy & gestation
Dog Pregnancy Calculator
Estimated canine due date.
OpenCat Pregnancy Calculator
Estimated feline due date.
OpenMare Gestation Calculator
Estimated foaling date.
OpenCow Gestation Calculator
Estimated calving date.
OpenGoat Gestation Calculator
Estimated kidding date.
OpenSheep Gestation Calculator
Estimated lambing date.
OpenSwine Gestation Calculator
Estimated farrowing date.
OpenRabbit Gestation Calculator
Estimated rabbit due date.
OpenGuinea Pig Pregnancy Calculator
Estimated guinea pig due date.
OpenLlama Pregnancy Calculator
Estimated llama due date.
Open