Is Your Donor Area Sufficient?
Upload your photo, get a personalized donor capacity analysis, and check your safe lifetime graft limits — in just 30 seconds.
Our Multimodal Visual Analysis evaluates several clinical variables simultaneously — the same factors a hair restoration surgeon reviews before recommending a procedure. No single metric determines the outcome; each input adjusts the final figure in relation to the others.
Assessment is focused on the permanent zone at the back and sides of the scalp, where follicles are considered resistant to long-term loss. Surface area visible in a photo is never taken at face value — findings are projected across a standardized anatomical landscape to ensure consistency regardless of image angle or framing.
The number of follicular units per cm² in the donor region is the primary driver of capacity. Our Multimodal Visual Analysis estimates this figure from the uploaded photo and uses it to determine both per-session limits and the total available reservoir. Higher density allows more to be extracted while still leaving the donor area looking natural.
Two people with identical graft counts can achieve very different coverage results. This ratio reflects how many individual hairs each follicular unit carries, and it directly shapes the coverage projection for the recipient area. It is one of the variables that most significantly separates a superficially adequate plan from a genuinely effective one.
Age is incorporated as a stability indicator rather than a cosmetic factor. Younger patients carry more uncertainty around future progression; the analysis accounts for the possibility that currently dense zones may change over time. Older patients are assessed with adjustments that reflect natural density shifts independent of pattern hair loss.
A previous transplant reduces the available reservoir. Patients with prior procedures receive a capacity estimate that accounts for earlier depletion — not the full theoretical maximum. Those in this group are advised to treat the output as an upper bound and seek in-person assessment before planning a further session.
A composite signal drawn from the visual assessment — incorporating observed density, signs of miniaturization within the safe zone, overall scalp condition, and contextual inputs. It summarizes how suitable the donor area is for extraction on a single index, giving a consolidated view of harvesting potential alongside the individual metrics.
We calculate the "Safe Zone" limits to prevent the transparent, moth-eaten look common in over-harvested procedures.
AI estimates your FU/cm² density, allowing a precise prediction of coverage for your balding areas.
Based on your age and miniaturization patterns, we predict if your donor hair will remain permanent.
This metric represents the estimated total number of hair follicles (grafts) available in your "safe donor area"—the region on the back and sides of your scalp genetically resistant to hair loss. However, it is medically unsafe to extract all of these follicles, as doing so would result in severe visible thinning or complete baldness in your donor zone.
This is the maximum number of grafts you can safely extract over your entire lifetime without your donor area looking thin or damaged. If you already had a hair transplant, this number shows your REMAINING capacity from now on, not your original limit. Clinical standards limit this amount to make sure your back hair always looks natural.
This figure outlines the maximum number of grafts a surgical team can safely extract during a single operation. Pushing beyond this medical limit in one session can cause excessive scalp trauma, compromise blood circulation, and ultimately lower the survival rate of the newly transplanted hair grafts.
This tool has been developed with reference to established medical literature and clinical guidelines. Our capacity estimation logic is guided by the peer-reviewed research and references listed below to provide you with a realistic biological assessment.
Standardized measurement and calculations of hair density and safe extraction.
ISHRSOfficial guidelines on donor area management, harvesting, and limitations.
PMCQuantitative analysis and clinical standards for hair reserve management.
PMCClinical evaluation parameters for donor capacities and follicular health.
Disclaimer: This estimator provides an objective assessment using visual algorithms based on clinical data, but it is not a substitute for an in-person physical consultation.