Compare Medical Tools

Side-by-side comparison helps you choose the right calculator for a specific clinical question.

Tool ATool B

Burns BSA

Dermatology

Estimate total body surface area (TBSA) affected by burns using the Rule of Nines. Enter affected areas to calculate total burn percentage. Then use TBSA result in [Parkland Formula](/tools/parkland-formula) for fluid resuscitation.

Formula

Total TBSA (%) = sum of all affected body region percentages. Maximum 100%.

Inputs

Head & Neck (max 9%)
Anterior Trunk (max 18%)
Posterior Trunk (max 18%)
Right Upper Limb (max 9%)
Left Upper Limb (max 9%)
Right Lower Limb (max 18%)
Left Lower Limb (max 18%)
Perineum (max 1%)

FAQs: 3

Open tool

PASI Score

Dermatology

Calculate the Psoriasis Area and Severity Index (PASI) to assess psoriasis severity across four body regions. Scores range from 0 to 72. Pair with [DLQI Score](/tools/dlqi) for biologic eligibility assessment.

Formula

PASI = 0.1 × (Eh + Ih + Sh) × Ah + 0.3 × (Et + It + St) × At + 0.2 × (Eu + Iu + Su) × Au + 0.4 × (El + Il + Sl) × Al

Inputs

Head — Erythema (redness)
Head — Induration (thickness)
Head — Desquamation (scaling)
Head — Area involved
Trunk — Erythema (redness)
Trunk — Induration (thickness)
Trunk — Desquamation (scaling)
Trunk — Area involved
Upper Limbs — Erythema (redness)
Upper Limbs — Induration (thickness)
Upper Limbs — Desquamation (scaling)
Upper Limbs — Area involved
Lower Limbs — Erythema (redness)
Lower Limbs — Induration (thickness)
Lower Limbs — Desquamation (scaling)
Lower Limbs — Area involved

FAQs: 3

Open tool

Compare Medical Tools

Side-by-side comparison helps you choose the right calculator for a specific clinical question.

Burns BSA

Dermatology

Formula

Total TBSA (%) = sum of all affected body region percentages. Maximum 100%.

Inputs

Head & Neck (max 9%)
Anterior Trunk (max 18%)
Posterior Trunk (max 18%)
Right Upper Limb (max 9%)
Left Upper Limb (max 9%)
Right Lower Limb (max 18%)
Left Lower Limb (max 18%)
Perineum (max 1%)

FAQs: 3

Open tool

PASI Score

Dermatology

Formula

PASI = 0.1 × (Eh + Ih + Sh) × Ah + 0.3 × (Et + It + St) × At + 0.2 × (Eu + Iu + Su) × Au + 0.4 × (El + Il + Sl) × Al

Inputs

Head — Erythema (redness)
Head — Induration (thickness)
Head — Desquamation (scaling)
Head — Area involved
Trunk — Erythema (redness)
Trunk — Induration (thickness)
Trunk — Desquamation (scaling)
Trunk — Area involved
Upper Limbs — Erythema (redness)
Upper Limbs — Induration (thickness)
Upper Limbs — Desquamation (scaling)
Upper Limbs — Area involved
Lower Limbs — Erythema (redness)
Lower Limbs — Induration (thickness)
Lower Limbs — Desquamation (scaling)
Lower Limbs — Area involved

FAQs: 3

Open tool