Why graft sizing matters
Amniotic allografts are HCT/P tissue products regulated under 21 CFR Part 1271. Each unit is a finite, biologic resource — sized in fixed dimensions such as 1×1 cm, 2×3 cm, 4×4 cm, or 4×8 cm. When a graft is meaningfully larger than the wound plus a clinically appropriate margin, the unused portion is discarded.
Right-sizing — selecting the smallest graft (or combination) that still fully covers the wound and margin — minimizes that discarded tissue. It is a clinical and logistical best practice, supports responsible stewardship of donor tissue, and aligns with current payer guidance on documented waste.
How the calculator works
We multiply your wound length × width to estimate the wound area, add a clinical margin (20% for regular wounds, 30% for irregular), then rank the available Tier-1 graft sizes by lowest leftover tissue. Combinations of multiple smaller grafts can also be considered when a single piece does not cleanly cover the wound — contact our clinical team for those cases.
Clinical aid only
This tool is provided as a logistical and clinical aid. It does not provide reimbursement, pricing, or financial guidance. Coverage, billing, and medical-necessity determinations remain the responsibility of the treating clinician and billing entity.