Patient & FlowNeeds clinical review
Body Surface Area
Estimate BSA from body measurements using one of five formulas, with an illustrative CI-to-CO conversion table.
Development preview. Not validated for clinical use. Clinical reviewer: pending · Last clinical review: not yet reviewed.
Calculated result
Choose a formula and enter measurements to calculate. Results are cleared whenever an input changes.
Limitations & references
BSA is an estimate, and formulas may differ. Formula selection and suitability for a patient population require clinical review. No drug dosing, flow targets, or normal/abnormal classifications are provided. Costeff is a weight-only estimate, not a neonatal-specific formula; this preview restricts it to the reported 1.5–100 kg range.
- Mosteller (1987): Simplified calculation of body-surface area
- Formula comparison: Mosteller, Du Bois and Haycock equations
- Formulae for calculating body surface area in modern U.S. Army Soldiers (2020): Boyd uses grams
- Costeff (1966): A simple empirical formula for calculating approximate surface area in children · Published equation and weight range
- NCBI: Cardiac index definition (CI = CO / BSA)