Tail Drop Probability Predictor
Scores handling, environment and stress factors for tail-autotomy species.
Geckos and some lizards drop their tails under stress. We score your handling approach and environment against known triggers and tell you when risk is high.
Run the calculator
Tail drop probability
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How to use this tool
This tool is designed for a single session at a time. Open it before you feed, set up, or change anything in your reptile's enclosure — not after. The output is a starting point; verify with your own observation of the animal.
Inputs are kept simple on purpose. Where a more detailed input would not change the recommendation, we omit it. Where it would (for example, snake species, UVB type), we surface it as a dropdown.
The result panel updates as you change inputs. There is no submit button — adjust inputs and read the result. We do this because the relationship between inputs and outputs is usually smooth, not step-wise.
Who this tool is for
Crested gecko, leopard gecko, anole, and blue-tongue skink keepers who handle their animals.
Limitations & when not to use
Risk score is a heuristic. Some individuals drop their tails at very low stress (and regenerate fine); others never do. Use the score as a guide, not a guarantee.
Outputs are not validated against your specific animal's vet history. If your reptile is sick, gravid, recently imported, or under treatment, ignore the output and consult a reptile-experienced vet.
Numbers are typical ranges based on common husbandry guidance and published data. They are not measurements of your specific setup. Where it matters, the result includes a 'verify with' hint (for example, a Solarmeter reading, a calibrated scale, a vet visit).
Frequently asked questions
Why do tails drop?
Does a dropped tail regrow?
How do I lower the risk?
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About this tool
What this tool is. Predicts rather than reacts. Built for keepers who want to avoid the visible stress that leads to a tail drop.
Why we built it. Herpwise collects scattered, often-conflicting reptile husbandry advice and turns it into specific, defensible recommendations. This tool exists because the health topic it covers is one where generic online advice is most often wrong or vague — keepers deserve a number, not a vibe.
Who built it. Herpwise is a small team of reptile keepers, breeders and software developers. We have kept (and made husbandry mistakes with) ball pythons, bearded dragons, leopard geckos, corn snakes, crested geckos, blue-tongue skinks, Russian and Hermann's tortoises, red-eared sliders, and several dart frogs. We are not veterinarians. Where a recommendation crosses into medical territory, we say so.
Limitations we accept. We do not collect data from you. We do not personalise across sessions. We do not replace a vet. We do not promise the perfect answer — we promise a defensible starting point, faster than reading five forum threads.
Privacy policy
Last updated. 2026. Effective immediately.
What we collect. Nothing personal. This tool runs entirely in your browser. We do not have a backend for these calculators — your inputs (species, weight, dimensions, etc.) never leave your device. There is no account, no login, no email capture, no analytics form on this page.
Cookies and local storage. We do not set any cookies for these tools. We do not use localStorage, sessionStorage, IndexedDB, or any other browser-side persistence. Closing the tab erases all input state.
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Children's privacy. This site is not directed at children under 13. Reptile keeping involves handling animals that can carry salmonella; adult supervision is required for any minor using this site.
Changes to this policy. We may update this privacy policy from time to time. The 'last updated' date at the top of this section will reflect any changes.
Contact. If you have questions about this privacy policy, you can reach us via the contact link on the homepage.
Disclaimer
Reference only. The information and tools provided on Herpwise are for general informational and educational purposes only. They are not a substitute for professional veterinary advice, diagnosis, or treatment. Always seek the advice of a qualified reptile-experienced veterinarian with any questions you may have regarding your animal's health or husbandry.
No professional relationship. Use of this site does not create a veterinarian-client, breeder-client, or any other professional relationship between you and Herpwise or any contributor. Reliance on any information provided by this site is solely at your own risk.
No warranty. Herpwise makes no representations or warranties about the accuracy, completeness, or suitability of the outputs of these tools for any particular animal or situation. The outputs reflect typical husbandry guidance and may not be appropriate for your specific animal.
Keepers' responsibility. You are responsible for the welfare of your animals. Decisions about feeding, housing, medical care, and breeding should be made in consultation with appropriate professionals, and should take into account the individual animal's condition, history, and needs.
External links. This site may contain links to external websites for additional context (veterinary associations, breeder directories, manufacturer documentation). We do not endorse and are not responsible for the content of external sites.