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Excision margin planner

Evidence-based peripheral margin recommendations by tumour type, risk features and body site, aligned to current UK guidelines.

Tool safetyClinician-support only

Margins shown are guideline starting points. The final margin is a clinician decision taking account of histology, anatomical site, reconstruction options and patient factors. Mohs micrographic surgery should be considered in line with the relevant monograph.

Tumour type
Body site
Breslow band
Recommended peripheral margin
10 mm

Breslow ≤ 1.0 mm: 1 cm wide local excision to fascia.

Source: NICE NG14
Important. This calculator is an educational aid for UK registered healthcare professionals. Deep margin should include full-thickness dermis where anatomy permits. H-zone (central face, periocular, nasal, auricular, genital) may warrant Mohs irrespective of output.

Source basis

  1. This page was launch-reviewed on 19 May 2026. See the source-control register for the NICE, NHS England, BAD, RCPath, WHO, AJCC / TNM and pivotal-trial sources used across the site; check live guidance and local MDT policy before applying recommendations.

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