Map the burn, get the number
Tap the burned regions on a Rule-of-Nines body diagram — adult, obese, or pediatric — and the calculator sums the total body surface area as you go. Drag each region to the fraction actually burned; it shows both how much of that area and how much of the whole body is involved, so the math is never a mystery.
Three formulas, the recommended one first
See the 24-hour Lactated Ringer's volume and the first-8-hour and next-16-hour rates for the ABLS consensus, Modified Brooke, and Parkland formulas. It defaults to ABLS — the lower-volume, start-and-titrate approach the evidence favors over chasing full Parkland — but the others are one tap away when your protocol calls for them.
Built for children and the obese
Pediatric patients get age-shifted surface-area proportions and a lower resuscitation threshold, and a given burn is graded more severely. Obese patients default to adjusted body weight so the volume isn't wildly over-estimated — with a one-tap switch back to total weight for the patient whose high BMI is muscle, not fat.
A starting point you titrate
Set the hours since injury to front-load fluid already missed in the field, and keep the urine-output target in view. The brain-icon rationale explains every choice — why ABLS, why the lower threshold in kids, why adjusted weight — so you can trust the number and teach from it.