Dermatology Calculators
22 calculators & risk scores
Browse 22 Dermatology clinical calculators and risk scores used in everyday UK practice. Every tool runs entirely in your browser — enter the values and get instant scoring, colour-coded interpretation bands and a link to the underlying guideline or publication. ClinCalc Pro is free, needs no sign-up, and is built for working clinicians.
These dermatology tools span Formula, Diagnosis, Prognosis, Melanoma, Urticaria, Scar Assessment and more.
- TBSA — Total Body Surface Area Burned (Rule of Nines)Lund-Browder / Rule of Nines method for estimating total body surface area burned. Guides fluid resuscitation and transfer criteria.
- PASI — Psoriasis Area and Severity IndexStandard severity scoring for plaque psoriasis. PASI ≥10 typically indicates moderate-to-severe disease requiring systemic treatment.
- DLQI — Dermatology Life Quality Index10-item patient-reported outcome measure for quality of life in skin conditions. Combined with PASI to assess biologic eligibility.
- Melanoma ABCDE CriteriaABCDE checklist for clinical evaluation of suspicious pigmented lesions. Positive features prompt urgent dermatology referral.
- EASI — Eczema Area and Severity IndexValidated severity score for atopic dermatitis (eczema) used to assess treatment response and biologic eligibility.
- SCORTEN — Severity Score for TEN/SJSSeverity-of-illness score for toxic epidermal necrolysis (TEN) and Stevens-Johnson syndrome (SJS) to predict mortality.
- Breslow Thickness & Melanoma StagingBreslow thickness is the primary determinant of melanoma T-stage and sentinel lymph node biopsy eligibility. Based on AJCC 8th edition staging.
- Urticaria Activity Score (UAS7)7-day urticaria activity score assessing wheals and pruritus, used to guide antihistamine dosing and omalizumab eligibility in chronic spontaneous urticaria (CSU).
- Vancouver Scar Scale (VSS)4-item clinical scar assessment tool evaluating vascularity, pigmentation, pliability, and height. Total score 0–13; higher score = worse scar. Used to assess burn scars, surgical scars, and response to treatment (silicone gel, pressure garments, laser therapy).
- Melanoma Breslow Thickness and StagingStages cutaneous melanoma based on Breslow thickness, ulceration, and mitotic rate per AJCC 8th edition. Guides surgical margin and sentinel lymph node biopsy decisions.
- PASI Score (Psoriasis Area and Severity Index)Quantifies psoriasis severity by assessing extent and intensity across four body regions. PASI >=10 defines moderate-severe psoriasis eligible for systemic therapy.
- DLQI (Dermatology Life Quality Index)Patient-reported quality of life questionnaire for skin disease. DLQI >10 indicates very large impact; combined with PASI triggers biologic eligibility.
- EASI Score (Eczema Area and Severity Index)Quantifies atopic dermatitis severity across four body regions. EASI >=16 = severe eczema; guides systemic/biologic therapy eligibility (dupilumab).
- Severe Drug Reaction Severity Score (RegiSCAR)Diagnoses Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) using RegiSCAR criteria. Score >=4 indicates definite DRESS.
- Acne Severity Classification (IGA Scale)Classifies acne vulgaris severity using the Investigator Global Assessment (IGA) scale. Guides topical vs systemic vs isotretinoin prescribing.
- VIDA Score (Vitiligo Disease Activity)Assesses disease activity in vitiligo using the Vitiligo Disease Activity (VIDA) score. Guides treatment selection (immunosuppression vs phototherapy vs surgical).
- Lund-Browder Chart — TBSA Burn EstimationAge-adjusted body-surface chart for estimating second- and third-degree burn TBSA. More accurate than Rule of Nines, particularly in children where the head accounts for a disproportionately large surface area. Use the resulting TBSA% with the Parkland formula for fluid resuscitation.
- SCORAD — SCORing Atopic DermatitisEuropean Task Force on Atopic Dermatitis severity index. Total = A/5 + 7B/2 + C, where A = extent (0–100% TBSA), B = sum of 6 intensity items (each 0–3, max 18), C = subjective pruritus + sleep loss VAS (0–20). Pick severity band below — or compute the formula manually.
- POEM — Patient-Oriented Eczema Measure7-item patient/parent-reported atopic eczema symptom score (Charman 2004). Each item 0–4 (days in past week). Total 0–28. Recommended core outcome by HOME initiative.
- Hurley Staging for Hidradenitis SuppurativaThree-stage clinical classification of hidradenitis suppurativa (Hurley 1989). Drives initial therapeutic stratification per BAD 2018 guidelines.
- Sartorius Score for Hidradenitis SuppurativaQuantitative dynamic activity score for HS (Sartorius 2003, modified 2009). Sums points by anatomical region, lesion type and distance between lesions. Use the band closest to your calculated value.
- MASI — Melasma Area and Severity IndexStandard quantitative melasma severity score (Kimbrough-Green 1994, modified Pandya 2011). Total 0–48 (0–24 for mMASI). Used in clinical trials and PROM monitoring.