Heat timing, due dates, puppy milestones, and adult size, built on the same engine that powers Whelpify dashboards. Use them here, share them, or put them on your own website.
Predict your female dog's next heat and likely fertile window from her last heat date, with an honest plus-or-minus range instead of a fake-precise date.
Open the calculator Free to embedWhen are the puppies due?Calculate when the puppies are due from the ovulation date, LH surge, or breeding date, plus a pregnancy timeline with ultrasound and X-ray windows.
Open the calculator Free to embedFrom birth to go-home day, mapped out.Enter a litter’s birth date and get the full development timeline: eyes opening, weaning, first vaccines, socialization windows, and go-home day.
Open the calculator Free to embedHow big will this puppy get?Estimate a puppy's adult weight from their current age and weight using size-class growth curves, with an honest range and when they will finish growing.
Open the calculator Free to embedBreed clubs, veterinary practices, and breeders can add any of these tools to a page with one snippet. It sizes itself to fit, keeps working as we improve it, and credits Whelpify underneath, which is how we keep the tools free.
<iframe src="https://whelpify.com/embed/tools/heat-cycle-calculator" title="Dog Heat Cycle Calculator" loading="lazy" data-whelpify-tool="heat-cycle-calculator" style="display:block;width:100%;max-width:960px;height:640px;border:0;border-radius:16px;box-shadow:0 8px 30px rgba(10,21,48,.08)"></iframe> <p style="margin:10px 0 0;font:14px/1.5 system-ui,sans-serif;color:#5c6478"><a href="https://whelpify.com/tools/heat-cycle-calculator" style="color:#2c5cff">Heat Cycle Calculator</a> by <a href="https://whelpify.com" style="color:#2c5cff">Whelpify</a>, free tools for dog breeders.</p>
Bring your program together with a website, puppy listings, applications, and payments. Go annual and claim your free custom domain after your first successful payment.
Free custom .com for one yearAnnual: after your first successful payment. Monthly: after two successful payments.Go Annual and Get It Sooner
Annual plans charge when you activate your website, with no trial. Monthly plans include a 30-day trial for new customers. Standard .com only. Paid renewal after year one.