Eczema Area and Severity Index

Physician-Reported Clinical Assessment

The recommended core instrument for measuring clinical signs of atopic dermatitis, endorsed by the HOME initiative. Evaluates four body regions across four severity characteristics with support for adult and pediatric weight sets.

AboutAbout This Calculator

April 7, 2026
10:55 p.m.

Eczema Area and Severity Index

Standard EASI (Adult)

0.0

/ 72

Clear

Estimated BSA: ~0.0%

Region Breakdown

Region	Weight	E	EP	EX	L	Area	Score
Head and Neck	0.1	0	0	0	0	0	0.0
Upper Extremities	0.2	0	0	0	0	0	0.0
Trunk	0.3	0	0	0	0	0	0.0
Lower Extremities	0.4	0	0	0	0	0	0.0

Calculation

Region score = W × (E + EP + EX + L) × A

Head: 0.1 × (0 + 0 + 0 + 0) × 0 = 0.0

Upper: 0.2 × (0 + 0 + 0 + 0) × 0 = 0.0

Trunk: 0.3 × (0 + 0 + 0 + 0) × 0 = 0.0

Lower: 0.4 × (0 + 0 + 0 + 0) × 0 = 0.0

Total: 0.0

For clinical use only. Generated by CMSD Clinical Tools.

cmsderm.ca

Age Group

Pediatric weighting increases the head/neck proportion to reflect the larger relative head size in children under 8 years. Learn more

Scoring Mode

Standard EASI scores area involvement using broad brackets. EASI-HD provides finer 1% granularity below 10% involvement. Learn more

Palm method for area estimation

1 patient palm (including fingers) ≈ 1% of total BSA. Learn more

Head and Neck

Weight: 10% of total BSA

Region score

0.0

Area of Involvement

Erythema

Edema / Papulation

Excoriation

Lichenification

Upper Extremities

Weight: 20% of total BSA

Region score

0.0

Area of Involvement

Erythema

Edema / Papulation

Excoriation

Lichenification

Trunk

Weight: 30% of total BSA

Region score

0.0

Area of Involvement

Erythema

Edema / Papulation

Excoriation

Lichenification

Lower Extremities

Weight: 40% of total BSA

Region score

0.0

Area of Involvement

Erythema

Edema / Papulation

Excoriation

Lichenification

0.0/ 72Clear

=0.0+0.0+0.0+0.0

Developed in partnership withDermi

About the EASI

Severity Bands

Score Range	Classification	Interpretation
0	Clear	No disease activity
0.1 – 1	Almost clear	Almost clear of disease
1.1 – 7	Mild	Mild atopic dermatitis
7.1 – 21	Moderate	Moderate atopic dermatitis
21.1 – 50	Severe	Severe atopic dermatitis
50.1 – 72	Very severe	Very severe atopic dermatitis

Clinical Background

The EASI is the recommended core instrument for measuring clinical signs in atopic dermatitis clinical trials, as endorsed by the Harmonising Outcome Measures for Eczema (HOME) initiative. It was developed by modifying the PASI scoring system for use in eczema. The EASI evaluates four body regions (head/neck, upper extremities, trunk, lower extremities) across two domains: percentage of body surface area affected (scored 0 to 6) and intensity of four lesional signs, erythema, edema/papulation, excoriation, and lichenification (each scored 0 to 3).

Each region is weighted by its proportion of total body surface area: head/neck = 0.1, upper extremities = 0.2, trunk = 0.3, lower extremities = 0.4 for adults. For children under 8 years, the weights adjust to 0.2, 0.2, 0.3, 0.3 respectively, reflecting the proportionally larger head in younger children. The theoretical maximum score is 72.

The EASI has demonstrated high content validity, construct validity, internal consistency, and sensitivity to change. It was selected by the HOME initiative after review of more than 16 instruments as having the best overall psychometric properties. Administration time is approximately 6 minutes by a trained investigator.

References

Hanifin JM, Thurston M, Omoto M, Cherill R, Tofte SJ, Graeber M. The Eczema Area and Severity Index (EASI): assessment of reliability in atopic dermatitis. Exp Dermatol. 2001;10(1):11-18. doi:10.1034/j.1600-0625.2001.100102.x
Schmitt J, Spuls PI, Thomas KS, et al.. The Harmonising Outcome Measures for Eczema (HOME) statement to assess clinical signs of atopic eczema in trials. J Allergy Clin Immunol. 2014;134(4):800-807. doi:10.1016/j.jaci.2014.07.043
Leshem YA, Hajar T, Hanifin JM, Simpson EL. What the EASI score tells us about the severity of atopic dermatitis: an interpretability study. Br J Dermatol. 2015;172(5):1353-1357. doi:10.1111/bjd.13662
Hanifin JM, Baghoomian W, Grinich E, Leshem YA, Jacobson M, Simpson EL. The Eczema Area and Severity Index - A Practical Guide. Dermatitis. 2022;33(3):187-192. doi:10.1097/der.0000000000000895
Schmitt J, Langan S, Deckert S, et al.. Assessment of clinical signs of atopic dermatitis: a systematic review and recommendation. J Allergy Clin Immunol. 2013;132(6):1337-1347. doi:10.1016/j.jaci.2013.07.008

Frequently Asked Questions about the EASI

The Eczema Area and Severity Index (EASI) is the recommended core instrument for measuring clinical signs in atopic dermatitis, endorsed by the Harmonising Outcome Measures for Eczema (HOME) initiative. It evaluates four body regions across the percentage of body surface area affected and the intensity of four lesional signs: erythema, edema/papulation, excoriation, and lichenification.

For each of the four body regions, the area of involvement is scored from 0 to 6 and multiplied by the sum of four severity scores (erythema, edema/papulation, excoriation, and lichenification, each scored 0 to 3). Each region is weighted by its proportion of total body surface area. For adults: head/neck = 0.1, upper extremities = 0.2, trunk = 0.3, lower extremities = 0.4. For children under 8 years, the weights adjust to 0.2, 0.2, 0.3, and 0.3 respectively.

An EASI score of 0 indicates clear skin with no disease activity. Scores of 0.1 to 1 are classified as almost clear, 1.1 to 7 as mild, 7.1 to 21 as moderate, 21.1 to 50 as severe, and 50.1 to 72 as very severe atopic dermatitis. The theoretical maximum score is 72.

The EASI was developed by modifying the PASI scoring system for use in eczema. While both assess four body regions with area and severity scoring, the EASI evaluates four severity characteristics (erythema, edema/papulation, excoriation, lichenification) compared to the PASI's three (erythema, induration, desquamation). The EASI also uses different severity grades (0 to 3) compared to the PASI (0 to 4), and includes pediatric weight adjustments.

Getting Started

A physician referral is required to access our medical services. Contact your primary care provider to begin the referral process.

Learn About Referrals Contact the Clinic