Dog Pregnancy & Reproductive Calculators
Ten free dog pregnancy and reproductive calculators for breeders and dog owners. From the moment of mating to the day the puppies arrive, these tools keep you informed, prepared, and one step ahead.
Every Calculator in This Category
Whether you're planning a litter, tracking a pregnancy, or trying to understand your dog's heat cycle — these ten tools have you covered.
Dog Breeding Calculator
Identify the optimal mating dates based on heat cycle start and individual ovulation pattern.
Dog Due Date Calculator
Calculate your dog's whelping due date from mating date, confirmed ovulation, or LH surge.
Dog Fertility Calculator
Calculate your female dog's fertile window, best breeding days, and expected whelping date from heat start.
Dog Gestation Calculator
Map the full 63-day gestation period with week-by-week puppy developmental milestones.
Dog Heat Cycle Calculator
Track your female dog's oestrus cycle and predict the next heat period and optimal breeding window.
Dog Labor Probability Calculator
Estimate how close your pregnant dog is to whelping based on her due date, current temperature, and physical signs.
Dog Ovulation Calculator
Predict the exact ovulation window for your female dog based on her heat cycle start date — essential for planned breeding.
Dog Pregnancy Calculator
Get the full 9-week pregnancy timeline from mating date — whelping date, developmental milestones, and vet visit windows.
Dog Season / Estrus Calculator
Predict when your female dog will next come into season (heat) and track her complete oestrus cycle stages.
Dog Whelping Calculator
Build a complete whelping preparation checklist with countdown tasks from 2 weeks before to birth day.
Puppy Due Date Calculator
Calculate pregnancy timeline and whelping date for a dog pregnant with her first or subsequent litter.
Puppy Gestation Calculator
Calculate pregnancy timeline and whelping date for a dog pregnant with her first or subsequent litter.
Puppy Pregnancy Calculator
Calculate pregnancy timeline and whelping date for a dog pregnant with her first or subsequent litter.
What These Reproductive Tools Cover
Canine pregnancy lasts approximately 63 days from ovulation — though mating dates and conception dates don't always align, which is why accurate due date calculation is trickier than it sounds. The heat cycle itself has four phases: proestrus, oestrus (the fertile window), diestrus, and anoestrus. Most breeders focus on oestrus, but tracking the full cycle dramatically improves breeding success rates.
Whether you're a first-time breeder or experienced, these calculators reduce the uncertainty that comes with canine reproduction. They won't replace your vet's progesterone testing, but they give you a reliable framework to work within.
63 Days From Ovulation
Canine gestation is consistent — good record-keeping makes all the difference.
How to Use These Calculators
Record the Mating Date
The more precisely you know when mating occurred, the more accurate the due date calculation.
Enter It into the Pregnancy Calculator
Get the full timeline — key development dates, vet visit windows, whelping date estimate.
Track the Heat Cycle
Use the Heat Cycle Calculator between litters to predict the next fertile window.
Prepare for Whelping
Use the Whelping Calculator to build a preparation checklist with timing for each stage of labour.
Why Dog Owners Trust Our Calculators
Precise Date Calculations
Our calculators use the 63-day ovulation baseline, not the less accurate mating-date method alone.
Full Cycle Tracking
Track heat cycles across multiple years to identify patterns and optimise breeding timing.
Whelping Prep Included
The Whelping Calculator gives you a practical preparation guide, not just a date.
Free for Breeders
All ten tools are free — no subscription needed even for serious breeders.
Frequently Asked Questions
Approximately 63 days from ovulation, or 58–68 days from the first mating. Variation is normal because mating doesn't always coincide with ovulation.
Most dogs cycle twice a year — roughly every 6 months — though this varies by breed and individual dog.
The oestrus phase, typically days 9–14 of the heat cycle, though progesterone testing with your vet gives a much more precise fertile window.
A clean whelping box, heat lamp, clean towels, a scale to weigh puppies, and your vet's emergency contact. Our Whelping Calculator gives a full checklist.
Plan Your Litter with Confidence
Ten free tools for breeders and dog owners. No account, no cost, just answers.
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