Health calculators

EASI Score Calculator

Updated Sep 15, 2026 By Infinity Calculator
Rate Formulas Medical disclaimer
Intended for use in patients 8 years of age or older with confirmed atopic dermatitis. A pediatric body surface area adjustment is available for patients under 8 years of age.

Patient Age Adjustment

Is this patient under 8 years of age?
Active multipliers: Head/Neck 0.10 · Upper Limbs 0.20 · Trunk 0.30 · Lower Limbs 0.40

Body Region Scoring

Total EASI Score

Total EASI Score
0.0
out of a maximum of 72.0
Clear
EASI75 Target (75% improvement from this baseline): 0.00
EASI90 Target (90% improvement from this baseline): 0.00

Regional Score Summary

Body Region Erythema Thickness Excoriation Lichenification Area Score Multiplier Region Score

Region Score vs. Maximum Possible

Step-by-Step Solution

Introduction

The EASI score (Eczema Area and Severity Index) tells you how bad a person's atopic dermatitis (eczema) is. This free EASI score calculator adds up each region as you pick the scores and shows the total right away.

The tool looks at four body parts: head and neck, upper limbs, trunk, and lower limbs. For each part, you rate four skin signs from 0 to 3:

  • Erythema (redness)
  • Thickness (swelling or raised skin)
  • Excoriation (scratch marks)
  • Lichenification (thick, leathery skin)

You also pick an area score from 0 to 6 that shows how much of that body part has eczema. Each body part is then multiplied by its own number, since some parts of the body are bigger than others. Add the four parts together and you get a total EASI score from 0 to 72. A higher score means worse eczema.

The calculator also shows your severity band (clear, mild, moderate, severe, or very severe) and your EASI75 and EASI90 targets. These are the scores you would reach if the eczema got 75% or 90% better. Doctors and drug studies use these targets to track progress.

This tool is made for patients 8 years and older. If the patient is under 8, switch on the pediatric setting. The calculator will then use the right body size numbers for a young child.

How to use our EASI Score Calculator

Enter the patient's age group, then score four eczema signs and the affected skin area for each of the four body regions. The calculator gives you a total EASI score out of 72, a severity rating, EASI75 and EASI90 targets, a score table, and a step-by-step solution.

Patient age adjustment: Pick "Yes" if the patient is under 8 years old, or "No" if they are 8 or older. This sets the body surface area multipliers used for each region.

Body region tabs: Click a tab to open Head/Neck, Upper Limbs, Trunk, or Lower Limbs. Score all five fields in each region. A check mark shows when a region is done.

Erythema: Choose 0 to 3 for how red the skin looks in that region. 0 means none, 1 is just visible, 2 is obvious, and 3 is severe.

Thickness: Choose 0 to 3 for swelling, bumps, or raised skin. This sign points to acute eczema.

Excoriation: Choose 0 to 3 for scratch marks and broken or scraped skin.

Lichenification: Choose 0 to 3 for thick, leathery skin with deep lines. This sign points to long-term eczema.

Percentage of region affected: Drag the slider from 0 to 6 to match how much of that region has active eczema. Step 0 is 0% and step 6 covers 90% to 100%.

Calculate: Click this button to update the total EASI score, severity band, chart, and full math breakdown.

Reset: Click to clear all scores, sliders, and the age setting, then confirm your choice.

Print: Click to print a clean summary of the scores. All four regions must be complete first.

What Is the EASI Score?

EASI stands for Eczema Area and Severity Index. It is a tool doctors use to measure how bad atopic dermatitis (eczema) is on a person's skin. The score runs from 0 to 72. A higher score means worse eczema. Doctors use it to track if a treatment is working over time.

The Four Body Regions

EASI splits the body into four parts. Each part counts for a different share of the total score, because each part covers a different amount of skin:

  • Head and neck (multiplier 0.10)
  • Upper limbs (arms), multiplier 0.20
  • Trunk (chest, belly, back), multiplier 0.30
  • Lower limbs (legs), multiplier 0.40

Kids under 8 years old have bigger heads and shorter legs. For them, the head and neck multiplier changes to 0.20 and the lower limbs change to 0.30.

The Four Skin Signs

In each region, the doctor grades four signs from 0 to 3 (0 = none, 1 = mild, 2 = moderate, 3 = severe):

  • Erythema (redness and swelling from inflammation)
  • Thickness (raised, puffy, or bumpy skin, common in new flares)
  • Excoriation (scratch marks and broken skin)
  • Lichenification (thick, leathery skin with deep lines, common in long-term eczema)

The Area Score

The doctor also estimates how much of each region has eczema. That percent turns into a number from 0 to 6:

  • 0 = no eczema
  • 1 = 1% to 9%
  • 2 = 10% to 29%
  • 3 = 30% to 49%
  • 4 = 50% to 69%
  • 5 = 70% to 89%
  • 6 = 90% to 100%

How the Math Works

For each region: add the four sign scores, multiply by the area score, then multiply by the region multiplier. Add all four region scores together to get the total EASI score.

What the Score Means

  • 0 is clear
  • 0.1 to 1.0 is almost clear
  • 1.1 to 7.0 is mild
  • 7.1 to 21.0 is moderate
  • 21.1 to 50.0 is severe
  • 50.1 to 72.0 is very severe

EASI75 and EASI90

These terms show how much a patient has improved. EASI75 means the score dropped by 75% from the starting score. EASI90 means it dropped by 90%. Drug trials often use EASI75 as the main goal for success. If a patient starts at 20, an EASI75 means getting down to 5 or lower.

Good to Know

EASI only looks at eczema signs a doctor can see. It does not score itch, sleep loss, or how the rash affects daily life. It also leaves out dryness and scaling. Because of that, doctors often pair EASI with other tools, like a patient itch scale or a quality-of-life survey, to get the full picture.

Formulas used

Region EASI score
S_{\text{region}} = (E + I + Ex + L) \times A \times M
Total EASI score
\text{EASI} = S_{\text{head/neck}} + S_{\text{upper}} + S_{\text{trunk}} + S_{\text{lower}}
Standard multipliers (age 8 years or older)
M_{\text{head/neck}} = 0.10,\; M_{\text{upper}} = 0.20,\; M_{\text{trunk}} = 0.30,\; M_{\text{lower}} = 0.40
Pediatric multipliers (under 8 years)
M_{\text{head/neck}} = 0.20,\; M_{\text{upper}} = 0.20,\; M_{\text{trunk}} = 0.30,\; M_{\text{lower}} = 0.30
EASI75 target score
\text{EASI75} = \text{EASI} \times 0.25
EASI90 target score
\text{EASI90} = \text{EASI} \times 0.10
Maximum possible region score
S_{\text{region,max}} = 12 \times 6 \times M
Progress bar fill percentage
P = \frac{\text{EASI}}{72} \times 100\%

Frequently asked questions

What EASI score counts as severe eczema for treatments like dupilumab?

Most drug studies call eczema severe at an EASI of 16 or higher. Some health systems set the bar at 21 or higher before they pay for a biologic drug.

Rules change by country and by insurance plan. Doctors also look at other things, like how much skin is involved, how bad the itch is, and whether creams and steroids already failed.

How much does an EASI score have to drop to count as real improvement?

About 6.6 points is the smallest drop a patient can actually feel. This is called the minimal clinically important difference (MCID).

Doctors also watch percent change:

  • EASI50: half as bad, a fair start
  • EASI75: the usual goal in drug trials
  • EASI90: near clear skin

A small drop on a high score matters more than the same drop on a low score.

What is the difference between EASI and SCORAD?

Both measure eczema, but they count different things.

  • EASI runs 0 to 72. It only scores what a doctor sees: redness, thickness, scratch marks, and leathery skin, plus how much skin is involved.
  • SCORAD runs 0 to 103. It adds dryness, oozing, crusting, and it asks the patient about itch and lost sleep.

EASI is quicker and is the tool most drug trials use. SCORAD gives more of the patient's own view.

What is the difference between EASI and PASI?

They look alike but treat different diseases.

  • EASI is for atopic dermatitis (eczema). It grades redness, thickness, excoriation, and lichenification.
  • PASI is for psoriasis. It grades redness, thickness, and scaling.

Both top out at 72 and both split the body into four regions with the same size weights. EASI does not score scaling, and PASI does not score scratch marks.

Which body parts belong to each EASI region?

The four regions cover the whole body:

  • Head and neck: face, ears, scalp, and neck
  • Upper limbs: shoulders, arms, forearms, and hands
  • Trunk: chest, belly, back, armpits, and groin
  • Lower limbs: buttocks, thighs, legs, and feet

Hands go with the arms and buttocks go with the legs. Nothing is scored twice.

How do you estimate the percent of a body region covered by eczema?

You judge how much of that one region has active eczema, not how much of the whole body.

One rule of thumb: the patient's flat palm with fingers is about 1% of their whole body. Since the head and neck is about 10% of the body, one palm-sized patch there fills roughly 10% of that region.

For scattered patches, picture pushing them together into one spot, then compare that to the whole region.

What do you do when eczema looks different in spots inside the same region?

Grade the average across all the eczema in that region, not the worst patch.

So if one arm has bright red skin (3) and the other has faint pink (1), the erythema score is about 2. Skip normal, clear skin when you average. You only rate the areas that have eczema.

How often should an EASI score be checked?

Score it at the first visit to set a baseline, then again at each follow-up.

Most clinics recheck every 4 to 12 weeks while starting a new treatment. Many drugs need 12 to 16 weeks before you can fairly judge if they work. Always use the same scorer when you can, so the numbers compare well.

Can a patient score their own EASI at home?

No. EASI is meant for a trained health professional who examines the skin in person. Judging thickness and lichenification takes touch and practice.

Patients can track their eczema with other tools made for self-reporting, like POEM (Patient-Oriented Eczema Measure) or a 0 to 10 itch scale. Doctors often pair those with EASI.

What is the mEASI score?

mEASI means modified EASI. It takes the normal EASI and adds a patient itch score, since plain EASI ignores itch.

The itch rating is weighted and added on, so the top score is higher than 72. It shows up in some older drug studies but is far less common than standard EASI today.

Why do doctors use EASI instead of just body surface area?

Body surface area (BSA) only tells you how much skin is affected. It says nothing about how bad the rash looks.

Two patients can both have 20% BSA, but one has faint pink skin and the other has cracked, thick, scratched-up skin. EASI blends area and severity, so those two get very different scores. That makes it better for tracking treatment.