Dermatology
Eczema Area and Severity Index (EASI)
EASI quantifies atopic dermatitis severity by grading erythema, edema/papulation, excoriation, and lichenification across four body regions. Extent is scored 0–6 per region. Total scores range 0–72.
Head/Neck
Body surface weight: 10%
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
Upper extremities
Body surface weight: 20%
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
Trunk
Body surface weight: 30%
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
Lower extremities
Body surface weight: 40%
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
0 none · 1 mild · 2 moderate · 3 severe
EASI score
216.0 / 72
Very severe disease activityVery severe disease. Multidisciplinary care and advanced systemic therapy often required.
How to Use This Calculator
Assess lesion extent
Determine percentage of each region involved and convert to the 0–6 extent scale (0 none, 6 = 90–100% involvement).
Grade morphologic features
Score erythema, edema/papulation, excoriation, and lichenification from 0 (none) to 3 (severe) in each region.
Track response over time
Use EASI to monitor treatment response, compare severity across visits, and align with clinician-reported outcomes.
Formula
EASI = Σ [Region weight × (Extent / 6) × (Σ severity scores)] × 72
Extent scale: 0 (0%) · 1 (<10%) · 2 (10–29%) · 3 (30–49%) · 4 (50–69%) · 5 (70–89%) · 6 (≥90%).
Maximum severity sum per region = 12. Maximum EASI = 72.
Full Description
The EASI score is a validated clinician assessment for atopic dermatitis severity. It evaluates four signs across four body regions, weighted by surface area. EASI is widely used in clinical trials to quantify disease activity and treatment response.
Combine EASI with patient-reported outcomes (e.g., POEM, DLQI) and pruritus scales for comprehensive care. Incorporate photographic documentation when possible. EASI complements SCORAD but omits subjective symptoms, focusing purely on objective signs.
Frequently Asked Questions
How often should EASI be recorded?
At baseline and regular follow-ups (every 4–12 weeks) or with therapy changes to monitor trend.
Does EASI include itch or sleep loss?
No. EASI is purely objective. Use POEM or SCORAD to capture patient symptoms.
What constitutes treatment success?
Clinical trials often use EASI-50 or EASI-75 (50% / 75% improvement). Goals should be individualized to patient needs.
Can nurse practitioners perform EASI scoring?
Yes, trained clinicians across specialties can perform EASI reliably with standardized instruction.