Dog Heat Cycle Calculator
Predict your dog's next heat, fertile window, and each stage of her estrous cycle based on her last heat date and size.
Frequently asked questions
What does the Dog Heat Cycle Calculator do?
Predict next heat, fertile window and phases of estrous cycle. It runs entirely in your browser and returns a result instantly.
Is the Dog Heat Cycle Calculator free to use?
Yes — the Dog Heat Cycle Calculator is 100% free. No signup, no email, no paywall. Just enter your pet's details and read the result.
How accurate is the Dog Heat Cycle Calculator?
Results are based on publicly available veterinary research and industry-standard estimation formulas. They are intended as a helpful guide only and do not replace professional veterinary advice. Always consult your veterinarian for medical or cost decisions.
What information do I need to use the Dog Heat Cycle Calculator?
You only need to provide basic details such as Last Heat Start Date, Cycle Length (Days). Nothing is uploaded.
Does the Dog Heat Cycle Calculator store my data?
No. All calculations happen locally in your browser. We do not store, transmit, or sell any information you enter.