WIfI Classification Tool - Limb Threat / Amputation Risk

WIfI Classification Calculator

Interactive Limb Threat & Amputation Risk calculator. Enter the wound, perfusion, and infection details below to compute WIfI grades (0 - 3) and the corresponding clinical stage (1 - 4) for 1-year amputation risk.

1. Wound (W) - choose the best descriptor

No ulcer / gangrene

Minor

Small or superficial ulcer on leg or foot, without gangrene

Deeper ulcer

Deep ulcer with exposed bone, joint, or tendon ± gangrene limited to digit

Extensive ulcer / gangrene

Extensive ulcer involving forefoot and/or midfoot ± calcaneal involvement ± extensive gangrene

2. Ischemia (I) - choose which perfusion test you have

Notes: Ranges follow WIfI/ESVS commonly used thresholds; select the range that matches your measurement.

3. Foot Infection (fI)

No infection

Mild

Local infection involving only the skin and subcutaneous tissue,erythema > 0.5 to ≤ 2 cm

Moderate

Local infection, with erythema > 2 cm or involving deeper structures

Severe

Local infection with systemic inflammatory response.